Tootfinder

Dynamic Human Trust Modeling of Autonomous Agents With Varying Capability and Strategy
Jason Dekarske (University of California, Davis), Zhaodan Kong (University of California, Davis), Sanjay Joshi (University of California, Davis)
https://arxiv.org/abs/2404.19291 https://arxiv.org/pdf/2404.19291
arXiv:2404.19291v1 Announce Type: new
Abstract: Objective We model the dynamic trust of human subjects in a human-autonomy-teaming screen-based task.
Background Trust is an emerging area of study in human-robot collaboration. Many studies have looked at the issue of robot performance as a sole predictor of human trust, but this could underestimate the complexity of the interaction.
Method Subjects were paired with autonomous agents to search an on-screen grid to determine the number of outlier objects. In each trial, a different autonomous agent with a preassigned capability used one of three search strategies and then reported the number of outliers it found as a fraction of its capability. Then, the subject reported their total outlier estimate. Human subjects then evaluated statements about the agent's behavior, reliability, and their trust in the agent.
Results 80 subjects were recruited. Self-reported trust was modeled using Ordinary Least Squares, but the group that interacted with varying capability agents on a short time order produced a better performing ARIMAX model. Models were cross-validated between groups and found a moderate improvement in the next trial trust prediction.
Conclusion A time series modeling approach reveals the effects of temporal ordering of agent performance on estimated trust. Recency bias may affect how subjects weigh the contribution of strategy or capability to trust. Understanding the connections between agent behavior, agent performance, and human trust is crucial to improving human-robot collaborative tasks.
Application The modeling approach in this study demonstrates the need to represent autonomous agent characteristics over time to capture changes in human trust.

This https://arxiv.org/abs/2401.16900 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

2-classifiers via dense generators and Hofmann-Streicher universe in stacks
We expand the theory of 2-classifiers, that are a 2-categorical generalization of subobject classifiers introduced by Weber. The idea is to upgrade monomorphisms to discrete opfibrations. We prove that the conditions of 2-classifier can be checked just on a dense generator. The study of what is classified by a 2-classifier is similarly reduced to a study over the objects that form a dense generator. We then apply our results to the cases of prestacks and stacks, where we can thus look just at t…

The population of small near-Earth objects: composition, source regions and rotational properties
Juan A. Sanchez, Vishnu Reddy, Audrey Thirouin, William F. Bottke, Theodore Kareta, Mario De Florio, Benjamin N. L. Sharkey, Adam Battle, David C. Cantillo, Neil Pearson
https://arxiv.org/abs/2404.18263

The population of small near-Earth objects: composition, source regions and rotational properties
The study of small ($<$300 m) near-Earth objects (NEOs) is important because they are more closely related than larger objects to the precursors of meteorites that fall on Earth. Collisions of these bodies with Earth are also more frequent. Although such collisions cannot produce massive extinction events, they can still produce significant local damage. Here we present the results of a photometric and spectroscopic survey of small NEOs, which include near-infrared (NIR) spectra of 84 objects w…

Metrization of Gromov-Hausdorff-type topologies on boundedly-compact metric spaces
Ryoichiro Noda
https://arxiv.org/abs/2404.19681 https://arxiv.org/pdf/2404.19681
arXiv:2404.19681v1 Announce Type: new
Abstract: We present a new general framework for metrization of Gromov-Hausdorff-type topologies on non-compact metric spaces. We also give easy-to-check conditions for separability and completeness and hence the measure theoretic requirements are provided to study convergence of random spaces with additional random objects. In particular, our framework enables us to define a metric inducing a suitable Gromov-Hausdorff-type topology on the space of rooted boundedly-compact metric spaces with laws of stochastic processes and/or random fields, which was not clear how to do in previous frameworks. In addition to general theory, this paper includes several examples of Gromov-Hausdorff-type topologies, verifying that classical examples such as the Gromov-Hausdorff topology and the Gromov-Hausdorff-Prohorov topology are contained within our framework.

On Clustering Induced Voronoi Diagrams
Danny Z. Chen, Ziyun Huang, Yangwei Liu, Jinhui Xu
https://arxiv.org/abs/2404.18906 https://ar…

On Clustering Induced Voronoi Diagrams
In this paper, we study a generalization of the classical Voronoi diagram, called clustering induced Voronoi diagram (CIVD). Different from the traditional model, CIVD takes as its sites the power set $U$ of an input set $P$ of objects. For each subset $C$ of $P$, CIVD uses an influence function $F(C,q)$ to measure the total (or joint) influence of all objects in $C$ on an arbitrary point $q$ in the space $\mathbb{R}^d$, and determines the influence-based Voronoi cell in $\mathbb{R}^d$ for $C$.…

This https://arxiv.org/abs/2312.02707 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

SKA Sensitivity to Sub-GeV Dark Matter Decay: Synchrotron Radio Emissions in White Dwarf Magnetospheres
We investigate the potential of the Square Kilometre Array (SKA) in detecting synchrotron radiation emitted from the decay of sub-GeV dark matter (dark matter with masses below the GeV scale) in the presence of strong magnetic fields. As a concrete setup, we consider scenarios where the magnetosphere of a magnetic white dwarf overlaps with dense dark matter environments, such as those surrounding a primordial black hole. Our study reveals that the encounters of compact objects such as white dwa…

This https://arxiv.org/abs/2403.09453 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Combinatorics of Essential Sets for Positroids
Positroids are families of matroids introduced by Postnikov in the study of non-negative Grassmannians. Postnikov identified several combinatorial objects in bijections with positroids, among which are bounded affine permutations. On the other hand, the notion of essential sets, introduced for permutations by Fulton, was used by Knutson in the study of the special family of interval rank positroids. We generalize Fulton's essential sets to bounded affine permutations. The bijection of the latte…

Common Fixed Points of Semihypergroup Representations
Choiti Bandyopadhyay
https://arxiv.org/abs/2404.18261 https://arxiv.org/pdf/240…

Common Fixed Points of Semihypergroup Representations
In a series of previous papers, we initiated a systematic study of semihypergroups and had a thorough discussion on certain analytic and algebraic aspects associated to this class of objects. In particular, we introduced the notion of semihypergroup actions on a general topological space and discussed different continuity, equivalence and natural fixed point properties of the same in [6]. Now in this article, we consider different kinds of representations of a semihypergroup on compact convex s…

This https://arxiv.org/abs/2308.10844 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Affine Hecke algebras and symmetric quasi-polynomial duality
In a recent paper with Sahi and Stokman, we introduced quasi-polynomial generalizations of Macdonald polynomials for arbitrary root systems via a new class of representations of the double affine Hecke algebra. These objects depend on a deformation parameter $q$, Hecke parameters, and an additional torus parameter. In this paper, we study $\textit{antisymmetric}$ and $\textit{symmetric}$ quasi-polynomial analogs of Macdonald polynomials in the $q \rightarrow \infty$ limit. We provide explicit d…

Some Computational Results on Koszul-Vinberg Cochain Complexes
Hanwen Liu, Jun Zhang
https://arxiv.org/abs/2404.18344 https://arxiv.o…

Some Computational Results on Koszul-Vinberg Cochain Complexes
An affine connection is said to be flat if its curvature tensor vanishes identically. Koszul-Vinberg (KV for abbreviation) cohomology has been invoked to study the deformation theory of flat and torsion-free affine connections on tangent bundle. In this Note, we compute explicitly the differentials of various specific KV cochains, and study their relation to classical objects in information geometry, including deformations associated with projective and dual-projective transformations of a flat…

U-VAP: User-specified Visual Appearance Personalization via Decoupled Self Augmentation
You Wu, Kean Liu, Xiaoyue Mi, Fan Tang, Juan Cao, Jintao Li
https://arxiv.org/abs/2403.20231

U-VAP: User-specified Visual Appearance Personalization via Decoupled Self Augmentation
Concept personalization methods enable large text-to-image models to learn specific subjects (e.g., objects/poses/3D models) and synthesize renditions in new contexts. Given that the image references are highly biased towards visual attributes, state-of-the-art personalization models tend to overfit the whole subject and cannot disentangle visual characteristics in pixel space. In this study, we proposed a more challenging setting, namely fine-grained visual appearance personalization. Differen…

Constraints on the mass of a bosonic dark matter candidate within the DD2Y-T model
Mahboubeh Shahrbaf, Davood Rafiei Karkevandi, Stefan Typel
https://arxiv.org/abs/2402.18686

Constraints on the mass of a bosonic dark matter candidate within the DD2Y-T model
Dark matter remains a topic of ongoing controversy. It has gained attention in the theoretical description of compact objects such as neutron stars with cores of very dense matter. Various candidates have been proposed for dark matter in the scientific literature. Among them, the sexaquark has been identified as a potential bosonic particle capable of being formed in neutron star matter based on its mass characteristics. In this study, we investigate the viability of the sexaquark as a candidat…

Modelling LAEs in the Epoch of Reionization with OBELISK
Emma Giovinazzo, Maxime Trebitsch, Valentin Mauerhofer, Pratika Dayal, Pascal A. Oesch
https://arxiv.org/abs/2402.17635

Modelling LAEs in the Epoch of Reionization with OBELISK
Lya emitters (LAEs) are particularly useful objects for the study of the Epoch of Reionization. Lya profiles can be used to estimate the amount of ionizing photons that are able to escape the galaxies, and therefore to understand what objects contributed to reionization. However, Lya is a resonant line and its complex radiative transfer effects make the interpretation of the line challenging and require the use of appropriate radiative transfer methods for anything but the simplest gas distribu…

Defect Localization Using Region of Interest and Histogram-Based Enhancement Approaches in 3D-Printing
Md Manjurul Ahsan, Shivakumar Raman, Zahed Siddique
https://arxiv.org/abs/2404.17015

Defect Localization Using Region of Interest and Histogram-Based Enhancement Approaches in 3D-Printing
Additive manufacturing (AM), particularly 3D printing, has revolutionized the production of complex structures across various industries. However, ensuring quality and detecting defects in 3D-printed objects remain significant challenges. This study focuses on improving defect detection in 3D-printed cylinders by integrating novel pre-processing techniques such as Region of Interest (ROI) selection, Histogram Equalization (HE), and Details Enhancer (DE) with Convolutional Neural Networks (CNNs)…

Measuring the Lense-Thirring precession and the neutron star moment of inertia with pulsars
Huanchen Hu, Paulo C. C. Freire
https://arxiv.org/abs/2403.18785

Measuring the Lense-Thirring precession and the neutron star moment of inertia with pulsars
Neutron stars (NSs) are compact objects that host the densest forms of matter in the observable universe, providing unique opportunities to study the behaviour of matter at extreme densities. While precision measurements of NS masses through pulsar timing have imposed effective constraints on the equation of state (EoS) of dense matter, accurately determining the radius or moment of inertia (MoI) of a NS remains a major challenge. This article presents a detailed review on measuring the Lense-T…

A Universe of Sound - processing NASA data into sonifications to explore participant response: #sonified NASA data of three astronomical objects presented as aural visualizations, then surveyed blind or low-vision and sighted individuals to elicit feedback on the experience of these pieces as it relates to enjoyment, education, and trust of the scientific data."

Spatio-seasonal risk assessment of upward lightning at tall objects using meteorological reanalysis data
Isabell Stucke, Deborah Morgenstern, Georg J. Mayr, Thorsten Simon, Achim Zeileis, Gerhard Diendorfer, Wolfgang Schulz, Hannes Pichler
https://arxiv.org/abs/2403.18853

Spatio-seasonal risk assessment of upward lightning at tall objects using meteorological reanalysis data
This study investigates lightning at tall objects and evaluates the risk of upward lightning (UL) over the eastern Alps and its surrounding areas. While uncommon, UL poses a threat, especially to wind turbines, as the long-duration current of UL can cause significant damage. Current risk assessment methods overlook the impact of meteorological conditions, potentially underestimating UL risks. Therefore, this study employs random forests, a machine learning technique, to analyze the relationship…

Cyclic sieving on permutations -- an analysis of maps and statistics in the FindStat database
Ashleigh Adams, Jennifer Elder, Nadia Lafreni\`ere, Erin McNicholas, Jessica Striker, Amanda Welch
https://arxiv.org/abs/2402.16251

Cyclic sieving on permutations -- an analysis of maps and statistics in the FindStat database
We perform a systematic study of permutation statistics and bijective maps on permutations using SageMath to search the FindStat combinatorial statistics database to identify apparent instances of the cyclic sieving phenomenon (CSP). Cyclic sieving occurs on a set of objects, a statistic, and a map of order $n$ when the evaluation of the statistic generating function at the $d$th power of the primitive $n$th root of unity equals the number of fixed points under the $d$th power of the map. Of th…

Exploring Gamma-Ray Burst Diversity: Clustering analysis of emission characteristics of Fermi and BATSE detected GRBs
Nishil Mehta, Shabnam Iyyani
https://arxiv.org/abs/2402.15260

Exploring Gamma-Ray Burst Diversity: Clustering analysis of emission characteristics of Fermi and BATSE detected GRBs
Gamma-ray bursts (GRBs) are commonly attributed to the demise of massive stars or the merger of binary compact objects. However, their varied emission characteristics strongly imply the existence of multiple GRB classes based on progenitor types, radiation mechanisms, central engines etc. This study utilizes unsupervised clustering with the Nested Gaussian Mixture Model algorithm to analyze {\it Fermi} and BATSE GRB data, identifying four classes (A, B, C, and D) based on duration, spectral pea…

This https://arxiv.org/abs/2312.11623 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

On heavy-flavour jets with Soft Drop
We study hadronic jets that are tagged as heavy-flavoured, i.e. they contain either beauty or charm. In particular, we consider heavy-flavour jets that have been groomed with the Soft Drop algorithm. In order to achieve a deeper understanding of these objects, we apply resummed perturbation theory to jets initiated by a massive quark and we perform analytic calculations for two variables that characterise Soft Drop jets, namely the opening angle and the momentum fraction of the splitting that p…

Enclosing Points with Geometric Objects
Timothy M. Chan, Qizheng He, Jie Xue
https://arxiv.org/abs/2402.17322 https://arxiv.org/pdf/2…

Enclosing Points with Geometric Objects
Let $X$ be a set of points in $\mathbb{R}^2$ and $\mathcal{O}$ be a set of geometric objects in $\mathbb{R}^2$, where $|X| + |\mathcal{O}| = n$. We study the problem of computing a minimum subset $\mathcal{O}^* \subseteq \mathcal{O}$ that encloses all points in $X$. Here a point $x \in X$ is enclosed by $\mathcal{O}^*$ if it lies in a bounded connected component of $\mathbb{R}^2 \backslash (\bigcup_{O \in \mathcal{O}^*} O)$. We propose two algorithmic frameworks to design po…

Hitting Meets Packing: How Hard Can it Be?
Jacob Focke, Fabian Frei, Shaohua Li, D\'aniel Marx, Philipp Schepper, Roohani Sharma, Karol W\k{e}grzycki
https://arxiv.org/abs/2402.14927

Hitting Meets Packing: How Hard Can it Be?
We study a general family of problems that form a common generalization of classic hitting (also referred to as covering or transversal) and packing problems. An instance of X-HitPack asks: Can removing k (deletable) vertices of a graph G prevent us from packing $\ell$ vertex-disjoint objects of type X? This problem captures a spectrum of problems with standard hitting and packing on opposite ends. Our main motivating question is whether the combination X-HitPack can be significantly harder tha…

Extremal problems about the order and size of nonhamiltonian locally linear graphs
Feng Liu, Leilei Zhang
https://arxiv.org/abs/2402.16066 https://<…

Extremal problems about the order and size of nonhamiltonian locally linear graphs
The study of the relationship between local and global properties of mathematical objects has always been a key subject of investigation in different areas of mathematics. A graph $G$ is called locally linear if the neighbourhood of every vertex of $G$ induces a path. And $G$ is called locally hamiltonian (traceable) if the neighbourhood of every vertex of $G$ induces a hamiltonian (traceable) graph. The local properties of graphs are being studied extensively. For example, the minimum order of…

Uniform Preorders and Partial Combinatory Algebras
Jonas Frey
https://arxiv.org/abs/2403.17340 https://arxiv.org/pdf/2403.17340

Uniform Preorders and Partial Combinatory Algebras
Uniform preorders are a class of combinatory representations of Set-indexed preorders that generalize Pieter Hofstra's basic relational objects. An indexed preorder is representable by a uniform preorder if and only if it has as generic predicate. We study the $\exists$-completion of indexed preorders on the level of uniform preorders, and identify a combinatory condition (called 'relational completeness') which characterizes those uniform preorders with finite meets whose $\exists$-completions…

One-dimensional Continuous-Time Quantum Markov Chains: qubit probabilities and measures
Manuel D. De la Iglesia, Carlos F. Lardizabal
https://arxiv.org/abs/2402.15878

One-dimensional Continuous-Time Quantum Markov Chains: qubit probabilities and measures
Quantum Markov chains (QMCs) are positive maps on a trace-class space describing open quantum dynamics on graphs. Such objects have a statistical resemblance with classical random walks, while at the same time it allows for internal (quantum) degrees of freedom. In this work we study continuous-time QMCs on the integer line, half-line and finite segments, so that we are able to obtain exact probability calculations in terms of the associated matrix-valued orthogonal polynomials and measures. Th…

Banach lattices with upper $p$-estimates: free and injective objects
E. Garc\'ia-S\'anchez, D. H. Leung, M. A. Taylor, P. Tradacete
https://arxiv.org/abs/2402.19152

Banach lattices with upper $p$-estimates: free and injective objects
We study the free Banach lattice $FBL^{(p,\infty)}[E]$ with upper $p$-estimates generated by a Banach space $E$. Using a classical result of Pisier on factorization through $L^{p,\infty}(μ)$ together with a finite dimensional reduction, it is shown that the spaces $\ell^{p,\infty}(n)$ witness the universal property of $FBL^{(p,\infty)}[E]$ isomorphically. As a consequence, we obtain a functional representation for $FBL^{(p,\infty)}[E]$. More generally, our proof allows us to identify the norm …

This https://arxiv.org/abs/2312.08124 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_ees…

Modeling Sparse Graph Sequences and Signals Using Generalized Graphons
Graphons are limit objects of sequences of graphs and are used to analyze the behavior of large graphs. Recently, graphon signal processing has been developed to study signal processing on large graphs. A major limitation of this approach is that any sparse sequence of graphs inevitably converges to the zero graphon, rendering the resulting signal processing theory trivial and inadequate for sparse graph sequences. To overcome this limitation, we propose a new signal processing framework that l…

Generative AI can not generate its way out of prejudice

The concept of "generative" suggests that the tool can produce what it is asked to produce. In a study uncovering how stereotypical global health tropes are embedded in AI image generators, researchers found it challenging to generate images of Black doctors treating white children. They used Midjourney, a tool that after hundreds of attempts would not generate an output matching the prompt. I tried their experiment with…

Axial Gravitational Perturbations of Slowly-Rotating Compact Objects in General Relativity and Beyond
Xing-Hui Feng, Jun Peng
https://arxiv.org/abs/2404.16437

Axial Gravitational Perturbations of Slowly-Rotating Compact Objects in General Relativity and Beyond
We study the axial gravitational perturbations of slowly-rotating compact objects which are assumed to be supported by anisotropic fluids. We find that the gravitational perturbations decouple from the matter perturbations for axial sectors. We obtain a master wave equation whose potential is fully determined by the metric functions. This equation makes the calculations of gravitational QNMs for rotating compact objects extremely easy in specific background configurations.

The power of relativistic jets: a comparative study
Luigi Foschini, Benedetta Dalla Barba, Merja Tornikoski, Heinz Andernach, Paola Marziani, Alan P. Marscher, Svetlana G. Jorstad, Emilia J\"arvel\"a, Sonia Ant\'on, Elena Dalla Bont\`a
https://arxiv.org/abs/2403.17581

The power of relativistic jets: a comparative study
We present the results of a comparison between different methods to estimate the power of relativistic jets from active galactic nuclei (AGN). We selected a sample of 32 objects (21 flat-spectrum radio quasars, 7 BL Lacertae Objects, 2 misaligned AGN, and 2 changing-look AGN) from the Very Large Baseline Array (VLBA) observations at 43 GHz of the Boston University blazar program. We then calculated the total, radiative, and kinetic jet power from both radio and high-energy gamma-ray observation…

A Contextual Inquiry of People with Vision Impairments in Cooking
Franklin Mingzhe Li, Michael Xieyang Liu, Shaun K. Kane, Patrick Carrington
https://arxiv.org/abs/2402.15108

A Contextual Inquiry of People with Vision Impairments in Cooking
Individuals with vision impairments employ a variety of strategies for object identification, such as pans or soy sauce, in the culinary process. In addition, they often rely on contextual details about objects, such as location, orientation, and current status, to autonomously execute cooking activities. To understand how people with vision impairments collect and use the contextual information of objects while cooking, we conducted a contextual inquiry study with 12 participants in their own …

Searching for large dark matter clumps using the Galileo Satnav clock variations
Bruno Bertrand, Pascale Defraigne, Aur\'elien Hees, Alexandra Sheremet, Cl\'ement Courde, Julien Chab\'e, Javier Ventura-Traveset, Florian Dilssner, Erik Schoenemann, Luis Mendes, Pac\^ome Delva
https://arxiv.org/abs/2403.17890

Searching for large dark matter clumps using the Galileo Satnav clock variations
This study presents bounds on transient variations of fundamental constants, with typical timescales ranging from minutes to months, using clocks in space. The underlying phenomenology describing such transient variations relies on models for Dark Matter (DM) which suggest possible encounters of macroscopic compact objects with the Earth, due to the motion of the solar system in the galactic halo. If such compact objects possess an effective feeble interaction with the ordinary matter beyond th…

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Twisted post-Hopf algebras, twisted relative Rota-Baxter operators and Hopf trusses
Jos\'e Manuel Fern\'andez Vilaboa, Ram\'on Gonz\'alez Rodr\'iguez, Brais Ramos P\'erez
https://arxiv.org/abs/2402.16704

Twisted post-Hopf algebras, twisted relative Rota-Baxter operators and Hopf trusses
The present article is devoted to study the categorical relationships between the categories of Hopf trusses, weak twisted post-Hopf algebras and weak twisted relative Rota-Baxter operators. The latter objects are a generalisation of relative Rota-Baxter operators where the Rota-Baxter condition is modified through a cocycle. Under certain conditions, this work shows that the three aforementioned categories are equivalent.

Hyperbolic Jacobsthal Spinor Sequences and Their Mathematical Properties
Selime Beyza \"Oz\c{c}evik, Abdullah Dertli
https://arxiv.org/abs/2403.14632 …

Hyperbolic Jacobsthal Spinor Sequences and Their Mathematical Properties
In this study, novel Hyperbolic spinor sequences of Jacobsthal, Jacobsthal-Lucas and Jacobsthal polynomial, which have not been studied before, are defined by investigating the relationship between spinors, which are important mathematical objects used in physics and mathematics, and split Jacobsthal and split Jacobsthal-Lucas quaternions, which are extensions of the known Jacobsthal and Jacobsthal-Lucas numbers to quaternion algebra. The recurrence relations of sequences whose members are Hype…

A Minority of C Objects Account for the Majority of Allocation CPU Time
Eugene Darashkevich, Roman Rusyaev, Roman Korostinskiy, Yegor Bugayenko
https://arxiv.org/abs/2403.06695 …

A Minority of C++ Objects Account for the Majority of Allocation CPU Time
In C++, an object can be allocated in static memory, on the stack, or on the heap, where the latter is by the order of magnitude more expensive operation, performance wise, than the first two. However, it is not clear how much overall performance loss may be attributed to the use of on-heap objects in C++ applications. This study aims to fill this gap by analyzing object allocation practices in open-source C++ code, investigating the frequency of stack and heap allocations using real-time dynam…

Hitting Meets Packing: How Hard Can it Be?
Jacob Focke, Fabian Frei, Shaohua Li, D\'aniel Marx, Philipp Schepper, Roohani Sharma, Karol W\k{e}grzycki
https://arxiv.org/abs/2402.14927

Hitting Meets Packing: How Hard Can it Be?
We study a general family of problems that form a common generalization of classic hitting (also referred to as covering or transversal) and packing problems. An instance of X-HitPack asks: Can removing k (deletable) vertices of a graph G prevent us from packing $\ell$ vertex-disjoint objects of type X? This problem captures a spectrum of problems with standard hitting and packing on opposite ends. Our main motivating question is whether the combination X-HitPack can be significantly harder tha…

History-Independent Concurrent Objects
Hagit Attiya, Michael A. Bender, Martin Farach-Colton, Rotem Oshman, Noa Schiller
https://arxiv.org/abs/2403.14445 h…

History-Independent Concurrent Objects
A data structure is called history independent if its internal memory representation does not reveal the history of operations applied to it, only its current state. In this paper we study history independence for concurrent data structures, and establish foundational possibility and impossibility results. We show that a large class of concurrent objects cannot be implemented from smaller base objects in a manner that is both wait-free and history independent; but if we settle for either lock-f…

Self-projective sets
Argyrios Christodoulou, Natalia Jurga
https://arxiv.org/abs/2402.12229 https://arxiv.org/pdf/2402.12229

Self-projective sets
Self-projective sets are natural fractal sets which describe the action of a semigroup of matrices on projective space. In recent years there has been growing interest in studying the dimension theory of self-projective sets, as well as progress in the understanding of closely related objects such as Furstenberg measures. The aim of this survey is twofold: first to motivate the study of these objects from several different perspectives and second to make the study of these objects more accessib…

Numerical analysis of a FE/SAV scheme for a Caginalp phase field model with mechanical effects in stereolithography
Xingguang Jin, Kei Fong Lam, Changqing Ye
https://arxiv.org/abs/2403.17434

Numerical analysis of a FE/SAV scheme for a Caginalp phase field model with mechanical effects in stereolithography
In this work we propose a phase field model based on a Caginalp system with mechanical effects to study the underlying physical and chemical processes behind stereolithography, which is an additive manufacturing (3D printing) technique that builds objects in a layer-by-layer fashion by using an ultraviolet laser to solidify liquid polymer resins. Existence of weak solutions is established by demonstrating the convergence of a numerical scheme based on a first order scalar auxiliary variable tem…

One-dimensional Continuous-Time Quantum Markov Chains: qubit probabilities and measures
Manuel D. De la Iglesia, Carlos F. Lardizabal
https://arxiv.org/abs/2402.15878

One-dimensional Continuous-Time Quantum Markov Chains: qubit probabilities and measures
Quantum Markov chains (QMCs) are positive maps on a trace-class space describing open quantum dynamics on graphs. Such objects have a statistical resemblance with classical random walks, while at the same time it allows for internal (quantum) degrees of freedom. In this work we study continuous-time QMCs on the integer line, half-line and finite segments, so that we are able to obtain exact probability calculations in terms of the associated matrix-valued orthogonal polynomials and measures. Th…

This https://arxiv.org/abs/2312.12026 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csLO_…

An Approximate Skolem Function Counter
One approach to probabilistic inference involves counting the number of models of a given Boolean formula. Here, we are interested in inferences involving higher-order objects, i.e., functions. We study the following task: Given a Boolean specification between a set of inputs and outputs, count the number of functions of inputs such that the specification is met. Such functions are called Skolem functions. We are motivated by the recent development of scalable approaches to Boolean function s…

A Universe of Sound: processing NASA data into sonifications to explore participant response https://www.frontiersin.org/articles/10.3389/fcomm.2024.1288896/full "Data analyses from 3,184 sighted or blind or low-vision survey participants yielded sig…

A Universe of Sound: processing NASA data into sonifications to explore participant response
IntroductionHistorically, astronomy has prioritized visuals to present information, with scientists and communicators overlooking the critical need to communicate astrophysics with blind or low-vision audiences and provide novel channels for sighted audiences to process scientific information.MethodsThis study sonified NASA data of three astronomical objects presented as aural visualizations, then surveyed blind or low-vision and sighted individuals to elicit feedback on the experience of these…

This https://arxiv.org/abs/2311.00920 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A note on gluing cosilting objects
Based on the recent work of M. Saorin and A. Zvonoreva of gluing (co)silting objects and L.A. Hugel, R. Laking, J. Stovicek and J. Vitora of mutating (co)silting objects, we first study further on gluing pure-injective cosilting objects in algebraic compactly generated triangulated categories and gluing cosilting complexes in the unbounded derived categories of rings. Then we discuss the compatibility of the gluing method and the mutation operation of cosilting objects.

Towards Safe Robot Use with Edged or Pointed Objects: A Surrogate Study Assembling a Human Hand Injury Protection Database
Robin Jeanne Kirschner, Carina M. Micheler, Yangcan Zhou, Sebastian Siegner, Mazin Hamad, Claudio Glowalla, Jan Neumann, Nader Rajaei, Rainer Burgkart, Sami Haddadin
https://arxiv.org/abs/2404.04004

Towards Safe Robot Use with Edged or Pointed Objects: A Surrogate Study Assembling a Human Hand Injury Protection Database
The use of pointed or edged tools or objects is one of the most challenging aspects of today's application of physical human-robot interaction (pHRI). One reason for this is that the severity of harm caused by such edged or pointed impactors is less well studied than for blunt impactors. Consequently, the standards specify well-reasoned force and pressure thresholds for blunt impactors and advise avoiding any edges and corners in contacts. Nevertheless, pointed or edged impactor geometries cann…

Perturbative Expansion of Yang-Baxter Operators
Emanuele Zappala
https://arxiv.org/abs/2403.09796 https://arxiv.org/pdf/2403.09796

Perturbative Expansion of Yang-Baxter Operators
We study the deformations of a wide class of Yang-Baxter (YB) operators arising from Lie algebras. We relate the higher order deformations of YB operators to Lie algebra deformations. We show that the obstruction to integrating deformations of self-distributive (SD) objects lie in the corresponding Lie algebra third cohomology group, and interpret this result in terms of YB deformations. We show that there are YB operators that admit integrable deformations (i.e. that can be deformed infinitely…

Generative AI can not generate its way out of prejudice

The concept of "generative" suggests that the tool can produce what it is asked to produce. In a study uncovering how stereotypical global health tropes are embedded in AI image generators, researchers found it challenging to generate images of Black doctors treating white children. They used Midjourney, a tool that after hundreds of attempts would not generate an output matching the prompt. I tried their experiment with…

A Topologically Enriched Probability Monad on the Cartesian Closed Category of CGWH Spaces
Peter Kristel, Benedikt Peterseim
https://arxiv.org/abs/2404.08430

A Topologically Enriched Probability Monad on the Cartesian Closed Category of CGWH Spaces
Probability monads on categories of topological spaces are classical objects of study in the categorical approach to probability theory. We construct a probability monad on the category of compactly generated weakly Hausdorff (CGWH) spaces, a (if not the) standard choice of convenient category of topological spaces. Because a novel version of the Riesz representation theorem plays a fundamental role in our construction, we name it the Riesz probability monad. We show that the Riesz probability …

Meticulous care for the Gutenberg Bible ensures that generations of visitors can continue to view and study it.
#yale

Invariant stability conditions on local $\mathbb{P}^1\times \mathbb{P}^1$ (after Del Monte-Longhi)
Yirui Xiong
https://arxiv.org/abs/2404.05232 https://

Invariant stability conditions on local $\mathbb{P}^1\times \mathbb{P}^1$ (after Del Monte-Longhi)
Let $X$ be the total space of canonical bundle of $\pp$, we study an invariant subspace of stability conditions on $X$ under an autoequivalence of $D^b(X)$. We describe the complete set of stable objects with respect to the invariant stability conditions and characterize the space of invariant stability conditions.

This https://arxiv.org/abs/2305.09248 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCG_…

Maximum-Width Rainbow-Bisecting Empty Annulus
Given a set of $n$ colored points with $k$ colors in the plane, we study the problem of computing a maximum-width rainbow-bisecting empty annulus (of objects specifically axis-parallel square, axis-parallel rectangle and circle) problem. We call a region rainbow if it contains at least one point of each color. The maximum-width rainbow-bisecting empty annulus problem asks to find an annulus $A$ of a particular shape with maximum possible width such that $A$ does not contain any input points and…

This https://arxiv.org/abs/2403.10475 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The role of heating on the formation and the dynamics of YSO jets : I. A parametric study
Theoretical arguments as well as observations of young stellar objects (YSO) support the presence of a diversified circumstellar environment. A stellar jet is thought to account for most of the stellar spin down and disk wind outflow for the observed high mass loss rate, thus playing a major role in the launching of powerful jets. RY Tau, for instance, is an extensively studied intermediate mass pre-main sequence star. Observational data reveal a small scale jet called microjet. Nevertheless, i…

This https://arxiv.org/abs/2310.18044 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Isolation of phase edges using off-axis q-plate filters
Edge-enhanced microscopes with q-plate have been attracted more attention to enhance the edges of phase-amplitude objects in biological sample due to their capability for all-directional edge enhancement, while differential interference-contrast microscopy enhances edges in only one-direction. However, the edge-enhanced microscopes cannot distinguish the edges of phase and amplitude objects, as both edges are equally enhanced. This study introduces a novel method for isolating the edge of a pha…

This https://arxiv.org/abs/2403.15321 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csHC_…

Visual Highlighting for Situated Brushing and Linking
Brushing and linking is widely used for visual analytics in desktop environments. However, using this approach to link many data items between situated (e.g., a virtual screen with data) and embedded views (e.g., highlighted objects in the physical environment) is largely unexplored. To this end, we study the effectiveness of visual highlighting techniques in helping users identify and link physical referents to brushed data marks in a situated scatterplot. In an exploratory virtual reality use…

This https://arxiv.org/abs/2307.01555 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A comparative study of MOND and MOG theories versus the$κ$-model: An application to galaxy clusters
Many models have been proposed to minimize the dark matter (DM) content in various astronomical objects at every scale in the Universe. The most widely known model isMOdified Newtonian Dynamics (MOND). MOND was first published by Mordehai Milgromin 1983 (Milgrom, 1983; 2015; see also Banik and Zhao, 2022 for a review). A second concurrent model is modified gravity (MOG), which is a covariant scalar-tensor-vector (STVG)extension of general relativity (Moffat, 2006; 2020). Other theories also exi…

Parking functions and {\L}ukasiewicz paths
Thomas Selig, Haoyue Zhu
https://arxiv.org/abs/2403.17438 https://arxiv.org/pdf/2403.17438…

Parking functions and Łukasiewicz paths
We present a bijection between two well-known objects in the ubiquitous Catalan family: non-decreasing parking functions and Łukasiewicz paths. This bijection maps the maximal displacement of a parking function to the height of the corresponding Łukasiewicz path, and the total displacement to the area of the path. We also study this bijection restricted to two specific families of parking-functions: unit-interval parking functions, and prime parking functions.

This https://arxiv.org/abs/2404.11214 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCV_…

Feature Corrective Transfer Learning: End-to-End Solutions to Object Detection in Non-Ideal Visual Conditions
A significant challenge in the field of object detection lies in the system's performance under non-ideal imaging conditions, such as rain, fog, low illumination, or raw Bayer images that lack ISP processing. Our study introduces "Feature Corrective Transfer Learning", a novel approach that leverages transfer learning and a bespoke loss function to facilitate the end-to-end detection of objects in these challenging scenarios without the need to convert non-ideal images into their RGB counterpar…

New theoretical study of potassium perturbed by He and a comparison to laboratory spectra
N. F. Allard, J. F. Kielkopf, K. Myneni, J. N. Blakely
https://arxiv.org/abs/2403.03059 <…

New theoretical study of potassium perturbed by He and a comparison to laboratory spectra
We report on our new calculations of unified line profiles of K perturbed by He using ab initio potential data for the conditions prevailing in cool substellar brown dwarfs and hot dense planetary atmospheres with temperatures from $T_\mathrm{eff}$=500~$\ \mathrm{K}$ to 3000~$\ \mathrm{K}$. For such objects with atmospheres of H$_2$ and He, conventional laboratory absorption spectroscopy can be used to examine the line wings and test the line shape theories and molecular potentials. We find tha…

Fishing for complements
Lidia Angeleri H\"ugel, David Pauksztello, Jorge Vit\'oria
https://arxiv.org/abs/2402.13356 https://…

Fishing for complements
Given a presilting object in a triangulated category, we find necessary and sufficient conditions for the existence of a complement. This is done both for classic (pre)silting objects and for large (pre)silting objects. The key technique is the study of associated co-t-structures. As a consequence of our techniques we recover some known cases of the existence of complements, including for derived categories of some hereditary abelian categories and for silting-discrete algebras. Moreover, we al…

Galaxies in the Zone of Avoidance: Misclassifications using machine learning tools
P. Marchant Cort\'es, J. L. Nilo Castell\'on, M. V. Alonso, L. Baravalle, C. Villal\'on, M. A. Sgr\'o, I. V. Daza-Perilla, M. Soto, F. Milla Castro, D. Minniti, N. Masetti, C. Valotto, M. Lares
https://arxiv.org/abs/2403.03098 https://arxiv.org/pdf/2403.03098
arXiv:2403.03098v1 Announce Type: new
Abstract: Automated methods for classifying extragalactic objects in large surveys offer significant advantages compared to manual approaches in terms of efficiency and consistency. However, the existence of the Galactic disk raises additional concerns. These regions are known for high levels of interstellar extinction, star crowding, and limited data sets and studies. In this study, we explore the identification and classification of galaxies in the Zone of Avoidance (ZoA). In particular, we compare our results in the near-infrared with X-ray data. We analize the appearance of the objects classified as galaxies using machine learning by Zhang et al. (2021) in the Galactic disk and make a comparison with the visually confirmed galaxies from the VVV NIRGC (Baravalle et al. (2021). Our analysis, which includes the visual inspection of all sources catalogued as galaxies throughout the Galactic disk using machine learning techniques reveals significant differences. Only 4 galaxies were found in both the near-Infrared and X-ray data sets. Several specific regions of interest within the ZoA exhibit a high probability of being galaxies in X-ray data but closely resemble extended Galactic objects. The results indicate the difficulty of using machine learning methods for galaxy classification in the ZoA mainly due to the scarce information on galaxies behind the Galactic plane in the training set. They also stress the importance of considering specific factors that are present to improve the reliability and accuracy of future studies in this challenging region.

This https://arxiv.org/abs/2306.04832 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Stationary rotating and axially symmetric dust systems as peculiar General Relativistic objects
We study an exact solution of Einstein's equations describing a self-gravitating system, made of dust, distributed with axial symmetry and in stationary rotation, and we prove that this type of system has no Newtonian analogue. In a low-energy limit, its existence depends on the solution of a Grad-Shafranov equation in vacuum which can be interpreted as a Laplace equation for the toroidal component of the gravitomagnetic potential; in particular, in this system the relativistic rotational effec…

Lagrangian Particle Tracking at Large Reynolds Numbers
Christian K\"uchler, Antonio Ibanez Landeta, Jan Molacek, Eberhard Bodenschatz
https://arxiv.org/abs/2404.04215

Lagrangian Particle Tracking at Large Reynolds Numbers
Particle tracking in turbulent flows is fundamental to the study of the transport of tracers, inertial particles or even active objects in space and time, i.e. the Lagrangian frame of reference. It provides experimental tests of theoretical predictions (e.g. for the statistics of fluid accelerations and particle dispersion) and helps to understand important natural processes where particle inertia is important (e.g. cloud microphysics). While the spatial (Eulerian) properties of turbulent flows…

Equivalence of multiset-based consequence relations
Ali Madanshekaf, Adam P\v{r}enosil, Zeinab Khanjanzadeh Seresti, Constantine Tsinakis
https://arxiv.org/abs/2404.04347

Equivalence of multiset-based consequence relations
The pioneering work of Blok and Jónsson and its further development by Galatos and Tsinakis initiated an abstract study of consequence relations using the tools of module theory, where consequence relations over all types of syntactic objects are put on an equal footing. However, the assumption that in a consequence relation the premises form merely a set, as opposed to a more complicated structure, is still retained. An attempt to extend this framework to account for inferentially substructur…

This https://arxiv.org/abs/2007.01477 has been replaced.
link: https://scholar.google.com/scholar?q=a

On odd-dimensional modular tensor categories
We study odd-dimensional modular tensor categories and maximally non-self dual (MNSD) modular tensor categories of low rank. We give lower bounds for the ranks of modular tensor categories in terms of the rank of the adjoint subcategory and the order of the group of invertible objects. As an application of these results, we prove that MNSD modular tensor categories of ranks 13 and 15 are pointed. In addition, we show that MNSD tensor categories of ranks 17, 19, 21 and 23 are either pointed or p…

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
Alberto Ulgiati, Simona Paiano, Aldo Treves, Renato Falomo, Boris Sbarufatti, Fabio Pintore, Thomas D. Russell, Giancarlo Cusumano
https://arxiv.org/abs/2402.12081

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
The fourth-DR3 version (4FGL-DR3) of the Fermi/LAT catalogue of $γ$-ray sources contains $\sim$ 1000 objects at a galactic latitude |b| > 10$^{\circ}$ which are not identified with an optical counterpart (UGS). We performed a systematic study of these sources, focusing on 190 objects that have a unique X-ray counterpart in the available Swift/XRT observations. Optical counterparts are then selected, and for 33 sources optical spectra were found in the literature. We found that 21 can…

This https://arxiv.org/abs/2309.13148 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

The Effect of Multiple Cooling Channels on the Formation of Dark Compact Objects
A dissipative dark sector can result in the formation of compact objects with masses comparable to stars and planets. In this work, we investigate the formation of such compact objects from a subdominant inelastic dark matter model, and study the resulting distributions of these objects. In particular, we consider cooling from dark Bremsstrahlung and a rapid decay process that occurs after inelastic upscattering. Inelastic transitions introduce an additional radiative processes which can impact…

An Improved Lower Bound on the Number of Pseudoline Arrangements
Fernando Cort\'es K\"uhnast, Stefan Felsner, Manfred Scheucher
https://arxiv.org/abs/2402.13107

An Improved Lower Bound on the Number of Pseudoline Arrangements
Arrangements of pseudolines are classic objects in discrete and computational geometry. They have been studied with increasing intensity since their introduction almost 100 years ago. The study of the number $B_n$ of non-isomorphic simple arrangements of $n$ pseudolines goes back to Goodman and Pollack, Knuth, and others. It is known that $B_n$ is in the order of $2^{Θ(n^2)}$ and finding asymptotic bounds on $b_n = \frac{\log_2(B_n)}{n^2}$ remains a challenging task. In 2011, Felsner and Valtr…

On the covariant coefficients of geodesic sprays on Finsler manifolds
S. G. Elgendi, A. Soleiman, Nabil L. Youssef
https://arxiv.org/abs/2404.07995 https:/…

On the covariant coefficients of geodesic sprays on Finsler manifolds
For a Finsler metric $F$, we introduce the notion of $F$-covariant coefficients $H_i$ of the geodesic spray of $F$ (Def. 3.1). We study some geometric consequences concerning the objects $H_i$. If the $F$-covariant coefficients $H_i$ are written in the form $H_i={\dot{\partial}}_iH$, for some smooth function $H$ on ${\mathcal T\hspace{-1pt}M}$, positively 3-homogeneous in y, then $H$ is called spray scalar or simply $S$-scalar. We prove that if the $S$-scalar exists, then it is of the form $H=\…

Accretion discs onto supermassive compact objects: a portal to dark matter physics in active galaxies
C. Millauro, C. R. Arg\"uelles, F. L. Vieyro, V. Crespi, M. F. Mestre
https://arxiv.org/abs/2402.12491

Accretion discs onto supermassive compact objects: a portal to dark matter physics in active galaxies
The study of the physics of accretion discs developed around the supermassive black hole (BH) candidates are essential theoretical tools to test their nature. Here, we study the accretion flow and associated emission using generalised $α$-discs on to horizonless dark compact objects, in order to compare with the traditional BH scenario. The BH alternative here proposed consists in a dense and highly degenerate core made of fermionic dark matter (DM) which is surrounded by a more diluted DM hal…

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
Alberto Ulgiati, Simona Paiano, Aldo Treves, Renato Falomo, Boris Sbarufatti, Fabio Pintore, Thomas D. Russell, Giancarlo Cusumano
https://arxiv.org/abs/2402.12081

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
The fourth-DR3 version (4FGL-DR3) of the Fermi/LAT catalogue of $γ$-ray sources contains $\sim$ 1000 objects at a galactic latitude |b| > 10$^{\circ}$ which are not identified with an optical counterpart (UGS). We performed a systematic study of these sources, focusing on 190 objects that have a unique X-ray counterpart in the available Swift/XRT observations. Optical counterparts are then selected, and for 33 sources optical spectra were found in the literature. We found that 21 can…

Rendez-vous with massive interstellar objects, as triggers of destabilisation
Denis V. Mikryukov, Ivan I. Shevchenko
https://arxiv.org/abs/2402.06934 https…

Rendez-vous with massive interstellar objects, as triggers of destabilisation
We study how close passages of interstellar objects of planetary and substellar masses may affect the immediate and long-term dynamics of the Solar system. We consider two nominal approach orbits, namely, the orbits of actual interstellar objects 1I/'Oumuamua and 2I/Borisov, assuming them to be typical or representative for interstellar swarms of matter. Thus, the nominal orbits of the interloper in our models cross the inner part of the Solar system. Series of massive numerical experiments are…

Optical appearance of black holes surrounded by a dark matter halo
Caio F. B. Macedo, Jo\~ao Lu\'is Rosa, Diego Rubiera-Garcia
https://arxiv.org/abs/2402.13047

Optical appearance of black holes surrounded by a dark matter halo
Black holes in General Relativity are described by space-time metrics that are simpler in comparison to non-vacuum compact objects. However, given the universality of the gravitational pull, it is expected that dark matter accumulates around astrophysical black holes, which can have an impact in the overall gravitational field, especially at galactic centers, and induce non-negligible effects in their observational imprints. In this work we study the optical appearance of a spherically symmetri…

This https://arxiv.org/abs/2007.01477 has been replaced.
link: https://scholar.google.com/scholar?q=a

On odd-dimensional modular tensor categories
We study odd-dimensional modular tensor categories and maximally non-self dual (MNSD) modular tensor categories of low rank. We give lower bounds for the ranks of modular tensor categories in terms of the rank of the adjoint subcategory and the order of the group of invertible objects. As an application of these results, we prove that MNSD modular tensor categories of ranks 13 and 15 are pointed. In addition, we show that MNSD tensor categories of ranks 17, 19, 21 and 23 are either pointed or p…

LISA Definition Study Report
Monica Colpi, Karsten Danzmann, Martin Hewitson, Kelly Holley-Bockelmann, Philippe Jetzer, Gijs Nelemans, Antoine Petiteau, David Shoemaker, Carlos Sopuerta, Robin Stebbins, Nial Tanvir, Henry Ward, William Joseph Weber, Ira Thorpe, Anna Daurskikh, Atul Deep, Ignacio Fern\'andez N\'u\~nez, C\'esar Garc\'ia Marirrodriga, Martin Gehler, Jean-Philippe Halain, Oliver Jennrich, Uwe Lammers, Jonan Larra\~naga, Maike Lieser, Nora L\"utzgendorf…

LISA Definition Study Report
The Laser Interferometer Space Antenna (LISA) is the first scientific endeavour to detect and study gravitational waves from space. LISA will survey the sky for Gravitational Waves in the 0.1 mHz to 1 Hz frequency band which will enable the study of a vast number of objects ranging from Galactic binaries and stellar mass black holes in the Milky Way, to distant massive black-hole mergers and the expansion of the Universe. This definition study report, or Red Book, presents a summary of the very…

An introduction to mixed Tate motives
Cl\'ement Dupont
https://arxiv.org/abs/2404.03770 https://arxiv.org/pdf/2404.03770

An introduction to mixed Tate motives
Mixed Tate motives are central objects in the study of cohomology groups of algebraic varieties and their arithmetic invariants. They also play a crucial role in a wide variety of questions related to multiple zeta values and polylogarithms, algebraic K-theory, hyperbolic geometry, and particle physics among others. This survey article is an introduction to mixed Tate motives and their many facets. It was written for the proceedings of the Summer School on Motives and Arithmetic Groups held in …

It's sometimes good to remember that many people have been debunking several
of Nielsen's assertions about usability for more than two decades. Not least the one about only needing to test with five users.

Here's a good study from 2001 (yes, 23 years ago) about page load times. By Christine Perfetti and Lori Landesman.

Remember when Amazon took 36 seconds to load over a 56kbps modem?

This https://arxiv.org/abs/2402.13107 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

An Improved Lower Bound on the Number of Pseudoline Arrangements
Arrangements of pseudolines are classic objects in discrete and computational geometry. They have been studied with increasing intensity since their introduction almost 100 years ago. The study of the number $B_n$ of non-isomorphic simple arrangements of $n$ pseudolines goes back to Goodman and Pollack, Knuth, and others. It is known that $B_n$ is in the order of $2^{Θ(n^2)}$ and finding asymptotic bounds on $b_n = \frac{\log_2(B_n)}{n^2}$ remains a challenging task. In 2011, Felsner and Valtr…

Photometric Re-calibration of VPHAS $u$-band Photometry with the Stellar Colour Regression Method and Gaia DR3
Bing-Qiu Chen, Hai-Bo Yuan, Bo-Wen Huang
https://arxiv.org/abs/2404.13817

Photometric Re-calibration of VPHAS+ $u$-band Photometry with the Stellar Colour Regression Method and Gaia DR3
The u band magnitude is vital for determining stellar parameters and investigating specific astronomical objects. However, flux calibration in the u band for stars in the Galactic disk presents significant challenges. In this study, we introduce a comprehensive re-calibration of $u$-band photometric magnitudes of the VPHAS+ Data Release 4 (DR4), employing the Stellar Colour Regression (SCR) technique. By leveraging the expansive set of XP spectra and $G_{\rm BP}$ photometry from Gaia Data Relea…

This https://arxiv.org/abs/2404.06797 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csDS_…

Fully Dynamic Correlation Clustering: Breaking 3-Approximation
We study the classic correlation clustering in the dynamic setting. Given $n$ objects and a complete labeling of the object-pairs as either similar or dissimilar, the goal is to partition the objects into arbitrarily many clusters while minimizing disagreements with the labels. In the dynamic setting, an update consists of a flip of a label of an edge. In a breakthrough result, [BDHSS, FOCS'19] showed how to maintain a 3-approximation with polylogarithmic update time by providing a dynamic impl…

The role of heating on the formation and the dynamics of YSO jets : I. A parametric study
C. Meskini, C. Sauty, A. Marcowith, N. Vlahakis, V. Brunn
https://arxiv.org/abs/2403.10475

The role of heating on the formation and the dynamics of YSO jets : I. A parametric study
Theoretical arguments as well as observations of young stellar objects (YSO) support the presence of a diversified circumstellar environment. A stellar jet is thought to account for most of the stellar spin down and disk wind outflow for the observed high mass loss rate, thus playing a major role in the launching of powerful jets. RY Tau, for instance, is an extensively studied intermediate mass pre-main sequence star. Observational data reveal a small scale jet called microjet. Nevertheless, i…

Integrability and combinatorics
Paul Zinn-Justin
https://arxiv.org/abs/2404.13221 https://arxiv.org/pdf/2404.13221

Integrability and combinatorics
We discuss the use of methods coming from integrable systems to study problems of enumerative and algebraic combinatorics, and develop two examples: the enumeration of Alternating Sign Matrices and related combinatorial objects, and the theory of symmetric polynomials.

Visual Highlighting for Situated Brushing and Linking
Nina Doerr, Benjamin Lee, Katarina Baricova, Dieter Schmalstieg, Michael Sedlmair
https://arxiv.org/abs/2403.15321

Visual Highlighting for Situated Brushing and Linking
Brushing and linking is widely used for visual analytics in desktop environments. However, using this approach to link many data items between situated (e.g., a virtual screen with data) and embedded views (e.g., highlighted objects in the physical environment) is largely unexplored. To this end, we study the effectiveness of visual highlighting techniques in helping users identify and link physical referents to brushed data marks in a situated scatterplot. In an exploratory virtual reality use…

This https://arxiv.org/abs/2307.15130 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCG_…

Bounding the Interleaving Distance for Mapper Graphs with a Loss Function
Data consisting of a graph with a function mapping into $\R^d$ arise in many data applications, encompassing structures such as Reeb graphs, geometric graphs, and knot embeddings. As such, the ability to compare and cluster such objects is required in a data analysis pipeline, leading to a need for distances between them. In this work, we study the interleaving distance on discretization of these objects, $\R^d$-mapper graphs, where functor representations of the data can be compared by finding…

Combinatorics of Essential Sets for Positroids
Fatemeh Mohammadi, Francesca Zaffalon
https://arxiv.org/abs/2403.09453 https://arxiv.o…

Combinatorics of Essential Sets for Positroids
Positroids are families of matroids introduced by Postnikov in the study of non-negative Grassmannians. Postnikov identified several combinatorial objects in bijections with positroids, among which are bounded affine permutations. On the other hand, the notion of essential sets, introduced for permutations by Fulton, was used by Knutson in the study of the special family of interval rank positroids. We generalize Fulton's essential sets to bounded affine permutations. The bijection of the latte…

This https://arxiv.org/abs/2303.05618 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Tropical Geometry, Quantum Affine Algebras, and Scattering Amplitudes
The goal of this paper is to make a connection between tropical geometry, representations of quantum affine algebras, and scattering amplitudes in physics. The connection allows us to study important and difficult questions in these areas: (1) We give a systematic construction of prime modules (including prime non-real modules) of quantum affine algebras using tropical geometry. We also introduce new objects which generalize positive tropical Grassmannians. (2) We propose a generalization o…

Combinatorics of Essential Sets for Positroids
Fatemeh Mohammadi, Francesca Zaffalon
https://arxiv.org/abs/2403.09453 https://arxiv.o…

Combinatorics of Essential Sets for Positroids
Positroids are families of matroids introduced by Postnikov in the study of non-negative Grassmannians. Postnikov identified several combinatorial objects in bijections with positroids, among which are bounded affine permutations. On the other hand, the notion of essential sets, introduced for permutations by Fulton, was used by Knutson in the study of the special family of interval rank positroids. We generalize Fulton's essential sets to bounded affine permutations. The bijection of the latte…

High Frequency Gravitational Wave Bounds from Galactic Neutron Stars
Virgile Dandoy, Toni Bert\'olez-Mart\'inez, Francesco Costa
https://arxiv.org/abs/2402.14092

High Frequency Gravitational Wave Bounds from Galactic Neutron Stars
High-Frequency Gravitational Waves (HFGWs) constitute a unique window on the early Universe as well as exotic astrophysical objects. If the current gravitational wave experiments are more dedicated to the low frequency regime, the graviton conversion into photons in a strong magnetic field constitutes a powerful tool to probe HFGWs. In this paper, we show that neutron stars, due to their extreme magnetic field, are a perfect laboratory to study the conversion of HFGWs into photons. Using realis…

Fully Dynamic Correlation Clustering: Breaking 3-Approximation
Soheil Behnezhad, Moses Charikar, Vincent Cohen-Addad, Alma Ghafari, Weiyun Ma
https://arxiv.org/abs/2404.06797

Fully Dynamic Correlation Clustering: Breaking 3-Approximation
We study the classic correlation clustering in the dynamic setting. Given $n$ objects and a complete labeling of the object-pairs as either similar or dissimilar, the goal is to partition the objects into arbitrarily many clusters while minimizing disagreements with the labels. In the dynamic setting, an update consists of a flip of a label of an edge. In a breakthrough result, [BDHSS, FOCS'19] showed how to maintain a 3-approximation with polylogarithmic update time by providing a dynamic impl…

This https://arxiv.org/abs/2307.13342 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Study of Magnetic Field and Turbulence in the TeV halo around Monogem Pulsar
Magnetic fields are ubiquitous in the interstellar medium, including extended objects such as supernova remnants and diffuse halos around Pulsars. Its turbulent characteristics govern the diffusion of cosmic rays and the multi-wavelength emission from PWNe. However, the geometry and turbulence nature of the magnetic fields in the ambient region of PWN is still unknown. Recent gamma-ray observations from HAWC and synchrotron observations suggest a highly suppressed diffusion coefficient compared…

Ephemeral Myographic Motion: Repurposing the Myo Armband to Control Disposable Pneumatic Sculptures
Celia Chen, Alex Leitch
https://arxiv.org/abs/2404.08065

Ephemeral Myographic Motion: Repurposing the Myo Armband to Control Disposable Pneumatic Sculptures
This paper details the development of an interactive sculpture built from deprecated hardware technology and intentionally decomposable, transient materials. We detail a case study of "Strain" - an emotive prototype that reclaims two orphaned digital artifacts to power a kinetic sculpture made of common disposable objects. We use the Myo, an abandoned myoelectric armband, in concert with the Programmable Air, a soft-robotics prototyping project, to manipulate a pneumatic bladder array construct…

This https://arxiv.org/abs/2309.11168 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Inverse problem of analog gravity systems
Analog gravity models of black holes and exotic compact objects provide a unique opportunity to study key properties of such systems in controlled laboratory environments. In contrast to astrophysical systems, analog gravity systems can be prepared carefully and their dynamical aspects thus investigated in unprecedented ways. While gravitational wave scattering properties of astrophysical compact objects are more connected to quasinormal modes, laboratory experiments can also access the transmi…

This https://arxiv.org/abs/2303.05618 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Tropical Geometry, Quantum Affine Algebras, and Scattering Amplitudes
The goal of this paper is to make a connection between tropical geometry, representations of quantum affine algebras, and scattering amplitudes in physics. The connection allows us to study important and difficult questions in these areas: (1) We give a systematic construction of prime modules (including prime non-real modules) of quantum affine algebras using tropical geometry. We also introduce new objects which generalize positive tropical Grassmannians. (2) We propose a generalization o…

Search and study of young infrared stellar clusters
Naira Azatyan
https://arxiv.org/abs/2404.05413 https://arxiv.org/pdf/2404.05413…

Search and study of young infrared stellar clusters
The main aim of this paper is to study both the Interstellar Medium (ISM) and the young stellar population in the three star-forming regions, namely IRAS 05137+3919, 05168+3634, and 19110+1045. The study of the ISM includes determination of the hydrogen column density (N(H_2)) and dust temperature (T_d) in the regions using Modified blackbody fitting. The main parameters of identified and classified young stellar objects (YSOs) belonging to the regions were determined comparing with the radiati…

This https://arxiv.org/abs/2402.07441 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCG_…

Fully Dynamic Geometric Vertex Cover and Matching
In this work, we study two fundamental graph optimization problems, minimum vertex cover (MVC) and maximum-cardinality matching (MCM), for intersection graphs of geometric objects, e.g., disks, rectangles, hypercubes, etc., in $d$-dimensional Euclidean space. We consider the problems in fully dynamic settings, allowing insertions and deletions of objects. We develop a general framework for dynamic MVC in intersection graphs, achieving sublinear amortized update time for most natural families …

From known to unknown: cosmic rays transition from the Sun, the Galaxy, and the Extra-Galaxy
Yu-Hua Yao, Yi-Qing Guo, Wei Liu
https://arxiv.org/abs/2403.13482

From known to unknown: cosmic rays transition from the Sun, the Galaxy, and the Extra-Galaxy
The Sun stands out as the closest and clearest astrophysical accelerator of cosmic rays, while other objects within and beyond the galaxy remain enigmatic. It is probable that the cosmic ray spectrum and mass components from these celestial sources share similarities, offering a novel approach to study their origin. In this study, we analyze of spectra and mass in the energy range from MeV to 10~EeV. We find: (1) the mean-logarithmic mass $\rm\left\langle lnA \right\rangle$ distribution with en…

This https://arxiv.org/abs/2403.12439 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Observational signatures of Rotating compact objects in Plasma space-time
We have investigated the characteristics of shadows cast by the Kerr black hole in the presence of plasma and compared them to those of a rotating wormhole in a uniform plasma space-time for an observer at infinity. Interestingly, for the same uniform plasma density, the apparent shadow size of the rotating wormhole is always greater than that of the Kerr black hole. To further distinguish the two compact objects we studied the deflection angle and did a comparative study in the presence of the…

This https://arxiv.org/abs/2401.13032 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Gas Dynamical Friction on Accreting Objects
The drag force experienced by astronomical objects moving through gaseous media (gas dynamical friction) plays a crucial role in their orbital evolution. Ostriker (1999) derived a formula for gas dynamical friction by linear analysis, and its validity has been confirmed through subsequent numerical simulations. However, the effect of gas accretion onto the objects on the dynamical friction is yet to be understood. In this study, we investigate the Mach number dependence of dynamical friction co…

Kinematics $\&$ Star Formation in the Hub-Filament System G6.55-0.1
Saurav Sen (TIFR, Mumbai, India), Bhaswati Mookerjea (TIFR, Mumbai, India), Rolf Guesten (MPIfR, Bonn), Friedrich Wyrowski (MPIfR, Bonn), C. H Ishwara Chandra (NCRA-TIFR, Pune, India)
https://arxiv.org/abs/2404.07640…

Kinematics $\&$ Star Formation in the Hub-Filament System G6.55-0.1
Hub-filament systems (HFSs) being the potential sites of formation of star clusters and high mass stars, provide a test bed for the current theories that attempt to explain star formation globally. It is thus important to study a large number of HFSs using both intensity and velocity information to constrain these objects better observationally. We present here a study of the hub-filament system associated with G6.55-0.1 using newly obtained observations of radio continuum and $J$=2--1 transiti…

This https://arxiv.org/abs/2403.18543 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Accurate analytical modeling of light rays in spherically symmetric spacetimes: Applications in the study of black hole accretion disks and polarimetry
We present new, simple analytical formulas to accurately describe light rays in spherically symmetric static spacetimes. These formulas extend those introduced by Beloborodov and refined by Poutanen for the Schwarzschild metric. Our enhanced formulas are designed to be applicable to a broader range of spacetimes, making them particularly valuable for describing phenomena around compact objects like neutron stars and black holes. As an illustration of their application, we present analytical stu…

This https://arxiv.org/abs/2403.18543 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Accurate analytical modeling of light rays in spherically symmetric spacetimes: Applications in the study of black hole accretion disks and polarimetry
We present new, simple analytical formulas to accurately describe light rays in spherically symmetric static spacetimes. These formulas extend those introduced by Beloborodov and refined by Poutanen for the Schwarzschild metric. Our enhanced formulas are designed to be applicable to a broader range of spacetimes, making them particularly valuable for describing phenomena around compact objects like neutron stars and black holes. As an illustration of their application, we present analytical stu…