Tootfinder

Lady of the Sea.
2 FREE wallpapers for you to use.
Also uploaded to my Ko-fi completely uncompressed (Mastodon compresses images) for free here: #MidJourneyArt

Click to view on Ko-fi
Follow Be Aware on Ko-fi

This https://arxiv.org/abs/2402.15674 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csPL_…

Formally Verified C Code Generation from Hybrid Communicating Sequential Processes
Hybrid Communicating Sequential Processes (HCSP) is a formal model for hybrid systems, including primitives for evolution along an ordinary differential equation (ODE), communication, and parallel composition. Code generation is needed to convert HCSP models into code that can be executed in practice, and the correctness of this conversion is essential to ensure that the generated code accurately reflects the formal model. In this paper, we propose a code generation algorithm from HCSP to C wit…

#TBT Lately I've been writing a lot of charts for upcoming shows in April and it jogged a long-forgotten memory of playing in this concert with the #LehighUniversity Very Modern Ensemble (LUVME) in 1981. It was a classical guitar part in a pretty crazy Amy Reich composition.
I honest…

SciCapenter: Supporting Caption Composition for Scientific Figures with Machine-Generated Captions and Ratings
Ting-Yao Hsu, Chieh-Yang Huang, Shih-Hong Huang, Ryan Rossi, Sungchul Kim, Tong Yu, C. Lee Giles, Ting-Hao K. Huang
https://arxiv.org/abs/2403.17784

SciCapenter: Supporting Caption Composition for Scientific Figures with Machine-Generated Captions and Ratings
Crafting effective captions for figures is important. Readers heavily depend on these captions to grasp the figure's message. However, despite a well-developed set of AI technologies for figures and captions, these have rarely been tested for usefulness in aiding caption writing. This paper introduces SciCapenter, an interactive system that puts together cutting-edge AI technologies for scientific figure captions to aid caption composition. SciCapenter generates a variety of captions for each f…

This https://arxiv.org/abs/2310.05649 has been replaced.
link: https://scholar.google.com/scholar?q=a

Context, Composition, Automation, and Communication -- The C2AC Roadmap for Modeling and Simulation
Simulation has become, in many application areas, a sine-qua-non. Most recently, COVID-19 has underlined the importance of simulation studies and limitations in current practices and methods. We identify four goals of methodological work for addressing these limitations. The first is to provide better support for capturing, representing, and evaluating the context of simulation studies, including research questions, assumptions, requirements, and activities contributing to a simulation study. I…

This https://arxiv.org/abs/2311.16991 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Asteroseismology of the young open cluster NGC 2516 I: Photometric and spectroscopic observations
Asteroseismic modelling of isolated star presents significant challenges due to the difficulty in accurately determining stellar parameters, particularly the stellar age. These challenges can be overcomed by observing stars in open clusters, whose coeval members share an initial chemical composition. The light curves by TESS allow us to investigate and analyse stellar variations in clusters with an unprecedented level. We aim to detect gravity-mode oscillations in the early-type main-sequence m…

This https://arxiv.org/abs/2403.10010 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A
We present the measurements of all-particle energy spectrum and mean logarithmic mass of cosmic rays in the energy range of 0.3-30 PeV using data collected from LHAASO-KM2A between September 2021 and December 2022, which is based on a nearly composition-independent energy reconstruction method, achieving unprecedented accuracy. Our analysis reveals the position of the knee at $3.67 \pm 0.05 \pm 0.15$ PeV. Below the knee, the spectral index is found to be -$2.7413 \pm 0.0004 \pm 0.0050$, while a…

Trees with flowers: A catalog of integer partition and integer composition trees with their asymptotic analysis
Ricardo G\'omez A\'iza
https://arxiv.org/abs/2402.16111

Trees with flowers: A catalog of integer partition and integer composition trees with their asymptotic analysis
We present families of combinatorial classes described as trees with nodes that can carry one of two types of ``flowers'': integer partitions or integer compositions. Two parameters on the flowers of trees will be considered: the number of ``petals'' in all the flowers (petals' weight) and the number of edges in the petals of all the flowers (flowers' weight). We give explicit expressions of their generating functions and deduce general formulas for the asymptotic growth of their coefficients a…

This https://arxiv.org/abs/2302.08907 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Fusion and (non)-rigidity of Virasoro Kac modules in logarithmic minimal models at $(p,q)$-central charge
Let $\mathcal{O}_c$ be the category of finite-length modules for the Virasoro Lie algebra at central charge $c$ whose composition factors are irreducible quotients of reducible Verma modules. For any $c\in\mathbb{C}$, this category admits the vertex algebraic braided tensor category structure of Huang, Lepowsky, and Zhang. Here, we begin the detailed study of $\mathcal{O}_{c_{p,q}}$ where $c_{p,q} = 1-\frac{6(p-q)^2}{pq}$ for relatively prime integers $p, q \geq 2$; in conformal field theory, $…

This https://arxiv.org/abs/2312.09491 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Axion-like Particle Detection in Alkali-Noble-Gas Haloscopes
Revealing the essence of dark matter (DM) and dark energy is essential for understanding our universe. Ultralight (rest energy $<$10 eV) bosonic particles, including pseudoscalar axions and axion-like particles (ALPs) have emerged among leading candidates to explain the composition of DM and searching for them has become an important part of precision-measurement science. Ultrahigh-sensitivity alkali-noble-gas based comagnetometers and magnetometers are being used as powerful haloscopes, i.e., …

This https://arxiv.org/abs/2203.14382 has been replaced.
link: https://scholar.google.com/scholar?q=a

Calabi-Yau structures on (quasi-)bisymplectic algebras
We show that relative Calabi--Yau structures on noncommutative moment maps give rise to (quasi-)bisymplectic structures, as introduced by Crawley-Boevey-Etingof-Ginzburg (in the additive case) and Van den Bergh (in the multiplicative case). We prove along the way that the fusion process (a) corresponds to the composition of Calabi-Yau cospans with "pair-of-pants" ones, and (b) preserves the duality between non-degenerate double quasi-Poisson structures and quasi-bisymplectic structures. As an a…

Hey friends!
We are just back from another nice 42km #cycling loop. Lots of headwind, lots of up and down and a little mistake in starting the tour at the highest point of the loop. The final, long ascent was a bit... Not so much fun.
But the views were just ace, more streets than yesterday but very few traffic! I was rather happy to have sun cream today.
Just a great Sunday!

Computational decomposition and composition technique for approximate solution of nonstationary problems
P. N. Vabishchevich
https://arxiv.org/abs/2403.18472

Computational decomposition and composition technique for approximate solution of nonstationary problems
Stable computational algorithms for the approximate solution of the Cauchy problem for nonstationary problems are based on implicit time approximations. Computational costs for boundary value problems for systems of coupled multidimensional equations can be reduced by additive decomposition of the problem operator(s) and composition of the approximate solution using particular explicit-implicit time approximations. Such a technique is currently applied in conditions where the decomposition step…

Symmetry-restricted quantum circuits are still well-behaved
Maximilian Balthasar Mansky, Santiago Londo\~no Castillo, Miguel Armayor-Mart\'inez, Alejandro Bravo de la Serna, Gautham Sathish, Zhihao Wang, Sebastian W\"olckerlt, Claudia Linnhoff-Popien
https://arxiv.org/abs/2402.16329…

Symmetry-restricted quantum circuits are still well-behaved
We show that quantum circuits restricted by a symmetry inherit the properties of the whole special unitary group $SU(2^n)$, in particular composition, algebraic and topological closedness and connectedness. It extends prior work on symmetric states to the operators and shows that the operator space follows the same structure as the state space. The well-behavedness is independent of the symmetry requirement imposed on the subgroup. We provide an example of a permutation invariance across all qu…

This https://arxiv.org/abs/2303.01643 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Additive Invariants of Open Petri Nets
We classify all additive invariants of open Petri nets: these are $\mathbb{N}$-valued invariants which are additive with respect to sequential and parallel composition of open Petri nets. In particular, we prove two classification theorems: one for open Petri nets and one for monically open Petri nets (i.e. open Petri nets whose interfaces are specified by monic maps). Our results can be summarized as follows. The additive invariants of open Petri nets are completely determined by their values …

DiFashion: Towards Personalized Outfit Generation
Yiyan Xu, Wenjie Wang, Fuli Feng, Yunshan Ma, Jizhi Zhang, Xiangnan He
https://arxiv.org/abs/2402.17279 h…

DiFashion: Towards Personalized Outfit Generation
The evolution of Outfit Recommendation (OR) in the realm of fashion has progressed through two distinct phases: Pre-defined Outfit Recommendation and Personalized Outfit Composition. Despite these advancements, both phases face limitations imposed by existing fashion products, hindering their effectiveness in meeting users' diverse fashion needs. The emergence of AI-generated content has paved the way for OR to overcome these constraints, demonstrating the potential for personalized outfit gene…

This https://arxiv.org/abs/2309.16735 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Shallow learning enables real-time inference of molecular composition from spectroscopy of brain tissue
Optical imaging modalities such as near-infrared spectroscopy (NIRS) and hyperspectral imaging (HSI) represent a promising alternative for low-cost, non-invasive, and fast monitoring of functional and structural properties of living tissue. Particularly, the possibility of extracting the molecular composition of the tissue from the optical spectra in real-time deems the spectroscopy techniques as a unique diagnostic tool. However, due to a lack of paired optical and molecular profiling studies,…

The Composition and Chemistry of Titan's Atmosphere
Conor A. Nixon
https://arxiv.org/abs/2402.17116 https://arxiv.org/pdf/2402.17…

The Composition and Chemistry of Titan's Atmosphere
In this article I summarize the current state of knowledge about the composition of Titan's atmosphere, and our current understanding of the suggested chemistry that leads to that observed composition. I begin with our present knowledge of the atmospheric composition, garnered from a variety of measurements including Cassini-Huygens, the Atacama Large Millimeter/submillimeter Array (ALMA), and other ground and space-based telescopes. This review focuses on the typical vertical profiles of gases…

Extended eigenvalues of composition operator on Bergman space and Fock space
Li Jiale
https://arxiv.org/abs/2403.18748 https://arxiv.…

Extended eigenvalues of composition operator on Bergman space and Fock space
A complex scalar k is said to be an extended eigenvalue of a bounded linear operator A on a complex Hilbert space if there is a nonzero operator X such that AX=kXA. There are some solutions to the problem of computing the extended eigenvalues for composition operators induced on the Fock space and Bergman space by linear fractional transformationsof the complex plane in this paper.

SongComposer: A Large Language Model for Lyric and Melody Composition in Song Generation
Shuangrui Ding, Zihan Liu, Xiaoyi Dong, Pan Zhang, Rui Qian, Conghui He, Dahua Lin, Jiaqi Wang
https://arxiv.org/abs/2402.17645

SongComposer: A Large Language Model for Lyric and Melody Composition in Song Generation
We present SongComposer, an innovative LLM designed for song composition. It could understand and generate melodies and lyrics in symbolic song representations, by leveraging the capability of LLM. Existing music-related LLM treated the music as quantized audio signals, while such implicit encoding leads to inefficient encoding and poor flexibility. In contrast, we resort to symbolic song representation, the mature and efficient way humans designed for music, and enable LLM to explicitly compos…

#TBT Lately I've been writing a lot of charts for upcoming shows in April and it jogged a long-forgotten memory of playing in this concert with the #LehighUniversity Very Modern Ensemble (LUVME) in 1981. It was a classical guitar part in a pretty crazy Amy Reich composition.
I honest…

This https://arxiv.org/abs/2301.04863 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Choosing observation operators to mitigate model error in Bayesian inverse problems
In statistical inference, a discrepancy between the parameter-to-observable map that generates the data and the parameter-to-observable map that is used for inference can lead to misspecified likelihoods and thus to incorrect estimates. In many inverse problems, the parameter-to-observable map is the composition of a linear state-to-observable map called an `observation operator' and a possibly nonlinear parameter-to-state map called the `model'. We consider such Bayesian inverse problems where…

Unraveling Functional Equations in Composition Algebra: Resolving Conjectures and Examining Implications
Daniel Kawai, Bruno Leonardo Macedo Ferreira
https://arxiv.org/abs/2403.17971

Unraveling Functional Equations in Composition Algebra: Resolving Conjectures and Examining Implications
We address the conjectures left by the recent article by Ferreira et al. titled ``Commuting maps and identities with inverses on alternative division rings.'' We also present an example showing the necessity of the conditions of the results that answer the conjectures.

In-plane ordering and tunable magnetism in Cr-based MXenes
Himangshu Sekhar Sarmah, Subhradip Ghosh
https://arxiv.org/abs/2402.17577 https://

In-plane ordering and tunable magnetism in Cr-based MXenes
MXene, the two-dimensional derivatives of MAX compounds, due to their structural and compositional flexibility, is an ideal family of compounds to study a number of structure-property relations. In this work, we have investigated the tunability of magnetic properties in Cr-based MXenes that have an in-plane ordering arising out of alloying Cr with another non-magnetic transition metal atom. Using Density Functional Theory based calculations we have explored the effects of composition and surfac…

Formally Verified C Code Generation from Hybrid Communicating Sequential Processes
Shuling Wang, Zekun Ji, Bohua Zhan, Xiong Xu, Qiang Gao, Naijun Zhan
https://arxiv.org/abs/2402.15674

Formally Verified C Code Generation from Hybrid Communicating Sequential Processes
Hybrid Communicating Sequential Processes (HCSP) is a formal model for hybrid systems, including primitives for evolution along an ordinary differential equation (ODE), communication, and parallel composition. Code generation is needed to convert HCSP models into code that can be executed in practice, and the correctness of this conversion is essential to ensure that the generated code accurately reflects the formal model. In this paper, we propose a code generation algorithm from HCSP to C wit…

This https://arxiv.org/abs/2307.00082 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Photometric determination of rotation axis inclination, rotation rate, and mass of rapidly rotating intermediate-mass stars
Intermediate-mass stars are often fast rotators, and hence are centrifugally flattened and affected by gravity darkening. To analyse this kind of stars properly, one must turn to 2D models to compute the visible radiative flux and to take the geometrical effect of the star inclination into account. Assuming a given stellar age and chemical composition, we aim to derive the mass and rotation rates of main sequence fast rotating stars, along with their inclination, from photometric quantities. We…

Non-monotonic surface tension leads to spontaneous symmetry breaking in a binary evaporating drop
Christian Diddens, Pim J. Dekker, Detlef Lohse
https://arxiv.org/abs/2402.17452 <…

Non-monotonic surface tension leads to spontaneous symmetry breaking in a binary evaporating drop
The evaporation of water/1,2-hexanediol binary drops shows remarkable segregation dynamics, with hexanediol-rich spots forming at the rim, thus breaking axisymmetry. While the segregation of hexanediol near the rim can be attributed to the preferential evaporation of water, the symmetry-breaking and spot formation could not yet be successfully explained. With three-dimensional simulations and azimuthal stability analysis of a minimal model, we investigate the flow and composition in the drop. W…

This https://arxiv.org/abs/2305.08256 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A generalization of operads based on subgraph contractions
We introduce a generalization of the notion of operad that we call a contractad, whose set of operations is indexed by connected graphs and whose composition rules are numbered by contractions of connected subgraphs. We show that many classical operads, such as the operad of commutative algebras, Lie algebras, associative algebras, pre-Lie algebras, the little disks operad, and the operad of moduli spaces of stable curves $\overline{\mathcal{M}}_{0,n+1}$ admit generalizations to contractads. We…

Determination of output composition in reaction-advection-diffusion systems on network reactors
Renato Feres, Eric Pasewark, Gregory Yablonsky
https://arxiv.org/abs/2403.18239

Determination of output composition in reaction-advection-diffusion systems on network reactors
We consider reaction-transport processes in open reactors in which systems of first order reactions involving a number of gas species and solid catalysts can occur at localized active regions. Reaction products flow out of the reactor into vacuum conditions and are collected at an exit boundary. The output composition problem (OCP) is to determine the composition (molar fractions) of the collected gas after the reactor is fully emptied. We provide a solution to this problem in the form of a bou…

Hey friends!
We are just back from another nice 42km #cycling loop. Lots of headwind, lots of up and down and a little mistake in starting the tour at the highest point of the loop. The final, long ascent was a bit... Not so much fun.
But the views were just ace, more streets than yesterday but very few traffic! I was rather happy to have sun cream today.
Just a great Sunday!

Symmetry-restricted quantum circuits are still well-behaved
Maximilian Balthasar Mansky, Santiago Londo\~no Castillo, Miguel Armayor-Mart\'inez, Alejandro Bravo de la Serna, Gautham Sathish, Zhihao Wang, Sebastian W\"olckerlt, Claudia Linnhoff-Popien
https://arxiv.org/abs/2402.16329…

Symmetry-restricted quantum circuits are still well-behaved
We show that quantum circuits restricted by a symmetry inherit the properties of the whole special unitary group $SU(2^n)$, in particular composition, algebraic and topological closedness and connectedness. It extends prior work on symmetric states to the operators and shows that the operator space follows the same structure as the state space. The well-behavedness is independent of the symmetry requirement imposed on the subgroup. We provide an example of a permutation invariance across all qu…

Understanding the Multi-wavelength Thermal Dust Polarization from the Orion Molecular Cloud in Light of the Radiative Torque Paradigm
Le Ngoc Tram, Thiem Hoang, Helmut Wiesemeyer, Isabelle Ristorcelli, Karl M. Menten, Nguyen Bich Ngoc, Pham Ngoc Diep
https://arxiv.org/abs/2403.17088

Understanding the Multi-wavelength Thermal Dust Polarization from the Orion Molecular Cloud in Light of the Radiative Torque Paradigm
Dust grains are important in various astrophysical processes and serve as indicators of interstellar medium structures, density, and mass. Understanding their physical properties and chemical composition is crucial in astrophysics. Dust polarization is a valuable tool for studying these properties. The Radiative Torque (RAT) paradigm, which includes Radiative Torque Alignment (RAT-A) and Radiative Torque Disruption (RAT-D), is essential to interpret the dust polarization data and constrain the …

Organizing Physics with Open Energy-Driven Systems
Matteo Capucci, Owen Lynch, David I. Spivak
https://arxiv.org/abs/2404.16140 https://

Organizing Physics with Open Energy-Driven Systems
Organizing physics has been a long-standing preoccupation of applied category theory, going back at least to Lawvere. We contribute to this research thread by noticing that Hamiltonian mechanics and gradient descent depend crucially on a consistent choice of transformation -- which we call a reaction structure -- from the cotangent bundle to the tangent bundle. We then construct a compositional theory of reaction structures. Reaction-based systems offer a different perspective on composition in…

Nonequilibrium Bound for Canonical Nonlinearity Under Single-Shot Work
Koretaka Yuge
https://arxiv.org/abs/2403.16383 https://arxiv.o…

Nonequilibrium Bound for Canonical Nonlinearity Under Single-Shot Work
For classical discrete systems under constant composition (specifically substitutional alloys), canonical average acts as a map from a set of many-body interatomic interactions to a set of configuration in thermodynamic equilibrium, which is generally nonlinear. In terms of the configurational geometry (i.e., information about configurational density of states), the nonlinearity has been measured as special vector on configuration space, which is extended to Kullback-Leibler (KL) divergence on …

Extended eigenvalues of composition operator on Bergman space and Fock space
Li Jiale
https://arxiv.org/abs/2403.18748 https://arxiv.…

Extended eigenvalues of composition operator on Bergman space and Fock space
A complex scalar k is said to be an extended eigenvalue of a bounded linear operator A on a complex Hilbert space if there is a nonzero operator X such that AX=kXA. There are some solutions to the problem of computing the extended eigenvalues for composition operators induced on the Fock space and Bergman space by linear fractional transformationsof the complex plane in this paper.

This https://arxiv.org/abs/2310.17543 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On invariant distributions of Feller Markov chains with applications to dynamical systems with random switching
We introduce simple conditions ensuring that invariant distributions of a Feller Markov chain on a compact Riemannian manifold are absolutely continuous with a lower semi-continuous, continuous or smooth density with respect to the Riemannian measure. This is applied to Markov chains obtained by random composition of maps and to piecewise deterministic Markov processes obtained by random switching between flows.

The sharp $C^0$-fragmentation property for Hamiltonian diffeomorphisms and homeomorphisms on surfaces
Baptiste Serraille
https://arxiv.org/abs/2403.15767 h…

The sharp $C^0$-fragmentation property for Hamiltonian diffeomorphisms and homeomorphisms on surfaces
In this paper, we present a $C^0$-fragmentation property for Hamiltonian diffeomorphisms. More precisely, it is known that for a given open covering $\mathcal{U}$ of a compact symplectic surface we can write each $C^0$-small enough Hamiltonian diffeomorphism as the composition of Hamiltonian diffeomorphisms compactly supported inside the open sets of the covering $\mathcal{U}$. We show that such a decomposition can be done with a Lipschitz estimate on the $C^0$-norm of the fragments. We also sh…

A highly efficient computational approach for part-scale microstructure predictions in Ti-6Al-4V additive manufacturing
Sebastian D. Proell, Julian Brotz, Martin Kronbichler, Wolfgang A. Wall, Christoph Meier
https://arxiv.org/abs/2402.17580

A highly efficient computational approach for part-scale microstructure predictions in Ti-6Al-4V additive manufacturing
Fast and efficient simulations of metal additive manufacturing (AM) processes are highly relevant to exploring the full potential of this promising manufacturing technique. The microstructure composition plays an important role in characterizing the part quality and deriving mechanical properties. When complete parts are simulated, one often needs to resort to strong simplifications such as layer-wise heating due to the large number of simulated time steps compared to the small time step sizes.…

Datasets of Great Britain Primary Substations Integrated with Household Heating Information
Yihong Zhou, Chaimaa Essayeh, Thomas Morstyn
https://arxiv.org/abs/2403.16313

Datasets of Great Britain Primary Substations Integrated with Household Heating Information
The growing demand for electrified heating, electrified transportation, and power-intensive data centres challenge distribution networks. If electrification projects are carried out without considering electrical distribution infrastructure, there could be unexpected blackouts and financial losses. Datasets containing real-world distribution network information are required to address this. On the other hand, social data, such as household heating composition, are closely coupled with people's …

Exploring why #Composition beats #Inheritance in software design for more flexible, maintainable code structures inspired by retro games. Dive into modular design principles. #SoftwareDevelopment

This https://arxiv.org/abs/2309.06985 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_sta…

CARE: Large Precision Matrix Estimation for Compositional Data
High-dimensional compositional data are prevalent in many applications. The simplex constraint poses intrinsic challenges to inferring the conditional dependence relationships among the components forming a composition, as encoded by a large precision matrix. We introduce a precise specification of the compositional precision matrix and relate it to its basis counterpart, which is shown to be asymptotically identifiable under suitable sparsity assumptions. By exploiting this connection, we prop…

Dark Matter Debunked in Revolutionary Cosmic Study #science #astrophysics
https://sci…

Dark Matter Debunked in Revolutionary Cosmic Study
The current theoretical model for the composition of the universe is that it’s made of ‘normal matter,’ ‘dark energy’ and ‘dark matter.’ A new study challenges this. A University of Ottawa study published in The Astrophysical Journal challenges the current model of the universe by showing that, i

General predictions of neutron star properties using unified relativistic mean-field equations of state
Luigi Scurto, Helena Pais, Francesca Gulminelli
https://arxiv.org/abs/2402.15548

General predictions of neutron star properties using unified relativistic mean-field equations of state
In this work we present general predictions for the static observables of neutron stars (NSs) under the hypothesis of a purely nucleonic composition of the ultra-dense baryonic matter, using Bayesian inference on a very large parameter space conditioned by both astrophysical and nuclear physics constraints. The equation of states are obtained using a unified approach of the NS core and inner crust within a fully covariant treatment based on a relativistic mean-field Lagrangian density with dens…

Compete and Compose: Learning Independent Mechanisms for Modular World Models
Anson Lei, Frederik Nolte, Bernhard Sch\"olkopf, Ingmar Posner
https://arxiv.org/abs/2404.15109 …

Compete and Compose: Learning Independent Mechanisms for Modular World Models
We present COmpetitive Mechanisms for Efficient Transfer (COMET), a modular world model which leverages reusable, independent mechanisms across different environments. COMET is trained on multiple environments with varying dynamics via a two-step process: competition and composition. This enables the model to recognise and learn transferable mechanisms. Specifically, in the competition phase, COMET is trained with a winner-takes-all gradient allocation, encouraging the emergence of independent …

Hey friends! My print arrived and is placed on the wall! 😍
#photo #photography #landscape

Compact linear combinations of composition operators on Hardy spaces
Evgueni Doubtsov, Dmitry Rutsky
https://arxiv.org/abs/2404.14947 https://

Compact linear combinations of composition operators on Hardy spaces
Let $φ_j$, $j=1,2, \dots, N$, be holomorphic self-maps of the unit disk $\mathbb{D}$ of $\mathbb{C}$. We prove that the compactness of a linear combination of the composition operators $C_{φ_j}: f\mapsto f\circφ_j$ on the Hardy space $H^p(\mathbb{D})$ does not depend on $p$ for $0

Long gamma-ray burst light curves as the result of a common stochastic pulse-avalanche process
Lorenzo Bazzanini, Lisa Ferro, Cristiano Guidorzi, Giuseppe Angora, Lorenzo Amati, Massimo Brescia, Mattia Bulla, Filippo Frontera, Romain Maccary, Manuele Maistrello, Piero Rosati, Anastasia Tsvetkova
https://arxiv.org/abs/2403.18754<…

Long gamma-ray burst light curves as the result of a common stochastic pulse-avalanche process
Context. The complexity and variety exhibited by the light curves of long gamma-ray bursts (GRBs) enclose a wealth of information that still awaits being fully deciphered. Despite the tremendous advance in the knowledge of the energetics, structure, and composition of the relativistic jet that results from the core collapse of the progenitor star, the nature of the inner engine, how it powers the relativistic outflow, and the dissipation mechanisms remain open issues. Aims. A promising way to g…

Amy Castor and @… analyze the composition and likely origin of the gas inside the #Bitcoin‍💩 and #Bitcoin‍ETF💩 bubbles. And recommend that

Bitcoin goes up, so it must come down. What goes into the price of BTC?
Even as the price went up through 2023, every day people wanted bitcoins less and less.

Broadband transverse susceptibility in multiferroic Y-type hexaferrite Ba0.5Sr1.5Co2Fe12O22
P. Hern\'andez-G\'omez, D. Mart\'in-Gonz\'alez, C. Torres, J. M. Mu\~noz
https://arxiv.org/abs/2402.16879

Broadband transverse susceptibility in multiferroic Y-type hexaferrite Ba0.5Sr1.5Co2Fe12O22
Single phase multiferroics in which ordered magnetic and ferroelectricity coexist, are of great interest for new multifunctional devices, and among them Y-type hexaferrites are good candidates. Transverse susceptibility measurements, which have been proved to be a versatile tool to study singular properties of bulk and nanoparticle magnetic systems, have been carried out with a broadband system on polycrystalline Y type hexaferrites with composition Ba0.5Sr1.5Co2Fe2O22, optimal to exhibit multi…

A highly efficient computational approach for part-scale microstructure predictions in Ti-6Al-4V additive manufacturing
Sebastian D. Proell, Julian Brotz, Martin Kronbichler, Wolfgang A. Wall, Christoph Meier
https://arxiv.org/abs/2402.17580

A highly efficient computational approach for part-scale microstructure predictions in Ti-6Al-4V additive manufacturing
Fast and efficient simulations of metal additive manufacturing (AM) processes are highly relevant to exploring the full potential of this promising manufacturing technique. The microstructure composition plays an important role in characterizing the part quality and deriving mechanical properties. When complete parts are simulated, one often needs to resort to strong simplifications such as layer-wise heating due to the large number of simulated time steps compared to the small time step sizes.…

This https://arxiv.org/abs/2308.14649 has been replaced.
link: https://scholar.google.com/scholar?q=a

Composition in Differential Privacy for General Granularity Notions (Long Version)
The composition theorems of differential privacy (DP) allow data curators to combine different algorithms to obtain a new algorithm that continues to satisfy DP. However, new granularity notions (i.e., neighborhood definitions), data domains, and composition settings have appeared in the literature that the classical composition theorems do not cover. For instance, the original parallel composition theorem does not translate well to general granularity notions. This complicates the opportunity …

This https://arxiv.org/abs/2402.05191 has been replaced.
link: https://scholar.google.com/scholar?q=a

Anisotropy of Density Fluctuations in the Solar Wind at 1 au
A well-known property of solar wind plasma turbulence is the observed anisotropy of the autocorrelations, or equivalently the spectra, of velocity and magnetic field fluctuations. Here we explore the related but apparently not well-studied issue of the anisotropy of plasma density fluctuations in the energy-containing and inertial ranges of solar wind turbulence. Using 10 years (1998-2008) of in situ data from the Advanced Composition Explorer (ACE) mission, we find that for all but the fastest…

This https://arxiv.org/abs/2110.07696 has been replaced.
link: https://scholar.google.com/scholar?q=a

Integrating Fréchet distance and AI reveals the evolutionary trajectory and origin of SARS-CoV-2
A genome, composed of a precisely ordered sequence of four nucleotides (ATCG), encompasses a multitude of specific genome features like AAA motif. Mutations occurring within a genome disrupt the sequential order and composition of these features, thereby influencing the evolutionary trajectories and yielding variants. The evolutionary relatedness between a variant and its ancestor can be estimated by assessing evolutionary distances across a spectrum of genome features. This study develops a no…

On monoids of metric preserving functions
Viktoriia Bilet, Oleksiy Dovgoshey
https://arxiv.org/abs/2404.13280 https://arxiv.org/pdf/2…

On monoids of metric preserving functions
Let $\mathbf{X}$ be a class of metric spaces and let $\mathbf{P}_{\mathbf{X}}$ be the set of all $f:[0, \infty)\to [0, \infty)$ preserving $\mathbf{X},$ $(Y, f\circρ)\in\mathbf{X}$ whenever $(Y, ρ)\in\mathbf{X}.$ For arbitrary subset $\mathbf{A}$ of the set of all metric preserving functions we show that the equality $\mathbf{P}_{\mathbf{X}}=\mathbf{A}$ has a solution iff $\mathbf{A}$ is a monoid with respect to the operation of function composition. In particular, for the set $\mathbf{SI}$ o…

This https://arxiv.org/abs/2305.19196 has been replaced.
link: https://scholar.google.com/scholar?q=a

Responsible Composition and Optimization of Integration Processes under Correctness Preserving Guarantees
Enterprise Application Integration deals with the problem of connecting heterogeneous applications, and is the centerpiece of current on-premise, cloud and device integration scenarios. For integration scenarios, structurally correct composition of patterns into processes and improvements of integration processes are crucial. In order to achieve this, we formalize compositions of integration patterns based on their characteristics, and describe optimization strategies that help to reduce the mo…

Balanced Data Sampling for Language Model Training with Clustering
Yunfan Shao, Linyang Li, Zhaoye Fei, Hang Yan, Dahua Lin, Xipeng Qiu
https://arxiv.org/abs/2402.14526

Balanced Data Sampling for Language Model Training with Clustering
Data plays a fundamental role in the training of Large Language Models (LLMs). While attention has been paid to the collection and composition of datasets, determining the data sampling strategy in training remains an open question. Most LLMs are trained with a simple strategy, random sampling. However, this sampling strategy ignores the unbalanced nature of training data distribution, which can be sub-optimal. In this paper, we propose ClusterClip Sampling to balance the text distribution of t…

This https://arxiv.org/abs/2311.07743 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Sensitivity of 3D Convective Urca Simulations to Changes in Urca Reactions
A proposed setting for thermonuclear (Type Ia) supernovae is a white dwarf that has gained mass from a companion to the point of carbon ignition in the core. There is a simmering phase in the early stages of burning that involves the formation and growth of a core convection zone. One aspect of this phase is the convective Urca process, a linking of weak nuclear reactions to convection that may alter the composition and structure of the white dwarf. Convective Urca is not well understood and re…

Multi-band reflectance and shadowing of RX J1604.3-2130 protoplanetary disk in scattered light
Huisheng Zhong, Bin B. Ren, Bo Ma, Chen Xie, Jie Ma, Nicole L. Wallack, Dimitri Mawet, Garreth Ruane
https://arxiv.org/abs/2402.16698

Multi-band reflectance and shadowing of RX J1604.3-2130 protoplanetary disk in scattered light
Context.Spatially-resoved cicrumstellar disk spectrum and composition can provide valuable insights into the bulk composition of forming planets, as well as the mineralogical signatures that emerge during and after planet formation. Aims. We aim to systemically extract the RX~J1604.3-213010 (J1604 hereafter) protoplanetary disk in high-contrast imaging observations, and obtain its multi-band reflectance in visible to near-infrared wavelengths. Methods. We obtained coronagraphic observations of …

Hi guys,
Last chance if you want to get this #photo of my #pristineWinter collection as a print from FineArtAmerica.
As I only have 25 items free there and want to upload new ones soon, I'll drop this one from the portfolio in the next couple of days.
Or - just enjoy it he…

Into the White Framed Print by Franz Graf
Purchase a framed print of the photograph "Into the White" by Franz Graf. Choose from multiple print sizes and hundreds of frame and mat options. All framed prints are professionally printed, framed, assembled, and shipped within 3 - 4 business days and delivered ready-to-hang on your wall.

Strong Linearizability using Primitives with Consensus Number 2
Hagit Attiya, Armando Casta\~neda, Constantin Enea
https://arxiv.org/abs/2402.13618 https:/…

Strong Linearizability using Primitives with Consensus Number 2
A powerful tool for designing complex concurrent programs is through composition with object implementations from lower-level primitives. Strongly-linearizable implementations allow to preserve hyper-properties, e.g., probabilistic guarantees of randomized programs. However, the only known wait-free strongly-linearizable implementations for many objects rely on compare&swap, a universal primitive that allows any number of processes to solve consensus. This is despite the fact that these objects…

Numerical integrators for confined Langevin dynamics
B. Leimkuhler, A. Sharma, M. V. Tretyakov
https://arxiv.org/abs/2404.16584 https://

Numerical integrators for confined Langevin dynamics
We derive and analyze numerical methods for weak approximation of underdamped (kinetic) Langevin dynamics in bounded domains. First-order methods are based on an Euler-type scheme interlaced with collisions with the boundary. To achieve second order, composition schemes are derived based on decomposition of the generator into collisional drift, impulse, and stochastic momentum evolution. In a deterministic setting, this approach would typically lead to first-order approximation, even in symmetr…

I ❤️ where this is going (incl. quite a few incoming additions to #Abstract

Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast

Ah, it was caused by mac-auto-operator-composition-mode (Emacs-Mac port): it seems that “]]” was replaced by a ligature, which then didn't match anymore. So, if one wants to use this feature with a font that supports such ligatures, one should probably set mac-auto-operator-composition-characters to a smaller set of characters to avoid surprises…
#Emacs

Ah, it was caused by mac-auto-operator-composition-mode (Emacs-Mac port): it seems that “]]” was replaced by a ligature, which then didn't match anymore. So, if one wants to use this feature with a font that supports such ligatures, one should probably set mac-auto-operator-composition-characters to a smaller set of characters to avoid surprises…
#Emacs

Weighted Composition Operator on Fock Space
Rui Hu
https://arxiv.org/abs/2403.16572 https://arxiv.org/pdf/2403.16572

Weighted Composition Operator on Fock Space
In this thesis, we establish a necessary and sufficient condition for a weighted composition operator to commute with a self-adjoint weighted composition operator on the Fock space, then obtain a sufficient condition for these commuting weighted composition operators to be normal.

This https://arxiv.org/abs/2207.09350 has been replaced.
link: https://scholar.google.com/scholar?q=a

Riemannian Stochastic Gradient Method for Nested Composition Optimization
This work considers optimization of composition of functions in a nested form over Riemannian manifolds where each function contains an expectation. This type of problems is gaining popularity in applications such as policy evaluation in reinforcement learning or model customization in meta-learning. The standard Riemannian stochastic gradient methods for non-compositional optimization cannot be directly applied as stochastic approximation of inner functions create bias in the gradients of the …

Ground- and excited-state properties of LiNb$_{1-x}$Ta$_x$O$_3$ solid solutions
Felix Bernhardt, Florian A. Pfeiffer, Felix Schug, Anton Pfannstiel, Tobias Hehemann, Steffen Ganschow, Mirco Imlau, Simone Sanna
https://arxiv.org/abs/2403.17623

Ground- and excited-state properties of LiNb$_{1-x}$Ta$_x$O$_3$ solid solutions
LiNb$_{1-x}$Ta$_x$O$_3$ solid solutions are investigated from first principles and by optical spectroscopy. The ground- and excited-state properties of the solid solutions are modelled within density functional theory as a function of the Ta concentration using special quasirandom structures spanning the entire composition range between LiNbO$_3$ and LiTaO$_3$. Deviations from a Vegard behavior are predicted for the lattice parameters, the heat capacity, the electronic bandgap, and consequently…

This https://arxiv.org/abs/2401.14253 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Vapor compression and energy dissipation in a collapsing laser-induced bubble
The composition of the gaseous phase of cavitation bubbles and its role on the collapse remains to date poorly understood. In this work, experiments of single cavitation bubbles in aqueous ammonia serve as a novel approach to investigate the effect of the vapor contained in a bubble on its collapse. We find that the higher vapor pressure of more concentrated aqueous ammonia acts as a resistance to the collapse, reducing the total energy dissipation. In line with visual observation, acoustic mea…

Norm attaining composition operators on Segal-Bargmann spaces
Neeru Bala, Sudip Ranjan Bhuia
https://arxiv.org/abs/2402.15482 https://

Norm attaining composition operators on Segal-Bargmann spaces
In this note, we study the composition operators on Segal-Bargmann spaces, which attains its norm and we show that every composition operators on the classical Fock space over $\mathbb{ C}^n$ is norm attaining. Also, we establish a necessary and sufficient condition for a sum of two kernel functions to be an extremal function for the norm of composition operators.

New Timing Results of MSPs from NICER Observations
Shijie Zheng, Dawei Han, Heng Xu, Kejia Lee, Jianping Yuan, Haoxi Wang, Mingyu Ge, Liang Zhang, Yongye Li, Yitao Yin, Xiang Ma, Yong Chen, Shuangnan Zhang
https://arxiv.org/abs/2404.16263

New Timing Results of MSPs from NICER Observations
Millisecond pulsars (MSPs) are known for their long-term stability. Using six years of observations from the Neutron Star Interior Composition Explorer (NICER), we have conducted an in-depth analysis of the X-ray timing results for six MSPs: PSRs B1937+21, B1821$-$24, J0437$-$4715, J0030+0451, J0218+4232, and J2124$-$3358. The timing stability parameter $σ_z$ has been calculated, revealing remarkable timing precision on the order of $10^{-14}$ for PSRs B1937+21 and J0437$-$4715, and $10^{-13}$…

This https://arxiv.org/abs/2402.17116 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The Composition and Chemistry of Titan's Atmosphere
In this article I summarize the current state of knowledge about the composition of Titan's atmosphere, and our current understanding of the suggested chemistry that leads to that observed composition. I begin with our present knowledge of the atmospheric composition, garnered from a variety of measurements including Cassini-Huygens, the Atacama Large Millimeter/submillimeter Array (ALMA), and other ground and space-based telescopes. This review focuses on the typical vertical profiles of gases…

This https://arxiv.org/abs/2308.14649 has been replaced.
link: https://scholar.google.com/scholar?q=a

Composition in Differential Privacy for General Granularity Notions (Long Version)
The composition theorems of differential privacy (DP) allow data curators to combine different algorithms to obtain a new algorithm that continues to satisfy DP. However, new granularity notions (i.e., neighborhood definitions), data domains, and composition settings have appeared in the literature that the classical composition theorems do not cover. For instance, the original parallel composition theorem does not translate well to general granularity notions. This complicates the opportunity …

This https://arxiv.org/abs/2110.07696 has been replaced.
link: https://scholar.google.com/scholar?q=a

Integrating Fréchet distance and AI reveals the evolutionary trajectory and origin of SARS-CoV-2
A genome, composed of a precisely ordered sequence of four nucleotides (ATCG), encompasses a multitude of specific genome features like AAA motif. Mutations occurring within a genome disrupt the sequential order and composition of these features, thereby influencing the evolutionary trajectories and yielding variants. The evolutionary relatedness between a variant and its ancestor can be estimated by assessing evolutionary distances across a spectrum of genome features. This study develops a no…

A class of symbols that induce bounded composition operators for Dirichlet-type spaces on the disc
Athanasios Beslikas
https://arxiv.org/abs/2402.10759 htt…

A class of symbols that induce bounded composition operators for Dirichlet-type spaces on the disc
In this note we study the problem of determining the holomorphic self maps of the unit disc that induce a bounded composition operator on Dirichlet-type spaces. We find a class of symbols $φ$ that induce a bounded composition operator on the Dirichlet-type spaces, by applying results of the multidimensional theory of composition operators for the weighted Bergman spaces of the bi-disc.

This https://arxiv.org/abs/2310.17543 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On invariant distributions of Feller Markov chains with applications to dynamical systems with random switching
We introduce simple conditions ensuring that invariant distributions of a Feller Markov chain on a compact Riemannian manifold are absolutely continuous with a lower semi-continuous, continuous or smooth density with respect to the Riemannian measure. This is applied to Markov chains obtained by random composition of maps and to piecewise deterministic Markov processes obtained by random switching between flows.

A Control Barrier Function Composition Approach for Multi-Agent Systems in Marine Applications
Yujia Yang, Chris Manzie, Ye Pu
https://arxiv.org/abs/2403.14369

A Control Barrier Function Composition Approach for Multi-Agent Systems in Marine Applications
The agents within a multi-agent system (MAS) operating in marine environments often need to utilize task payloads and avoid collisions in coordination, necessitating adherence to a set of relative-pose constraints, which may include field-of-view, line-of-sight, collision-avoidance, and range constraints. A nominal controller designed for reference tracking may not guarantee the marine MAS stays safe w.r.t. these constraints. To modify the nominal input as one that enforces safety, we introduce…

I ❤️ where this is going (incl. quite a few incoming additions to #Abstract

Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast

This https://arxiv.org/abs/2303.17518 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Constraining a relativistic mean field model using neutron star mass-radius measurements I: Nucleonic models
Measurements of neutron star mass and radius or tidal deformability deliver unique insight into the equation of state (EOS) of cold dense matter. EOS inference is very often done using generalized parametric or non-parametric models which deliver no information on composition. In this paper we consider a microscopic nuclear EOS model based on a field theoretical approach. We show that current measurements from NICER and gravitational wave observations constrain primarily the symmetric nuclear m…

Ascent and Descent of Weighted Composition Operators on Lorentz spaces
Gopal Datt, Daljeet Singh Bajaj
https://arxiv.org/abs/2404.16491 https://

Ascent and Descent of Weighted Composition Operators on Lorentz spaces
The aim of this article is to detect the ascent and descent of weighted composition operators on Lorentz spaces. We investigate the conditions on the measurable transformation $T$ and the complex-valued measurable function $u$ defined on measure space $(X, \mathcal{A}, μ)$ that cause the weighted composition operators on Lorentz space $L(p, q)$, $1 < p \leq \infty, 1 \leq q \leq \infty$ to have finite or infinite ascent (descent). We also give a number of examples in support of our findings.

This https://arxiv.org/abs/2303.04097 has been replaced.
link: https://scholar.google.com/scholar?q=a

On additive differential probabilities of the composition of bitwise exclusive-or and a bit rotation
Properties of the additive differential probability $\mathrm{adp}^{\mathrm{XR}}$ of the composition of bitwise XOR and a bit rotation are investigated, where the differences are expressed using addition modulo $2^n$. This composition is widely used in ARX constructions consisting of additions modulo $2^n$, bit rotations and bitwise XORs. Differential cryptanalysis of such primitives may involve maximums of $\mathrm{adp}^{\mathrm{XR}}$, where some of its input or output differences are fixed. Al…

A class of symbols that induce bounded composition operators for Dirichlet-type spaces on the disc
Athanasios Beslikas
https://arxiv.org/abs/2402.10759 htt…

A class of symbols that induce bounded composition operators for Dirichlet-type spaces on the disc
In this note we study the problem of determining the holomorphic self maps of the unit disc that induce a bounded composition operator on Dirichlet-type spaces. We find a class of symbols $φ$ that induce a bounded composition operator on the Dirichlet-type spaces, by applying results of the multidimensional theory of composition operators for the weighted Bergman spaces of the bi-disc.

This https://arxiv.org/abs/2310.17699 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Honing cross-correlation tools for inference on ultra-high-energy cosmic-ray composition
The chemical composition of the highest-energy cosmic rays, namely the atomic number $Z$ of rays with energies $E\gtrsim40~\mathrm{EeV}$, remains to date largely unknown. Some information on the composition can be inferred from the deflections that charged ultra-high-energy cosmic rays experience while they traverse intervening magnetic fields. Indeed, such deflections distort and suppress the original anisotropy in the cosmic ray arrival directions; thus, given a source model, a measure of the…

A link between the size and composition of comets
James E. Robinson, Uri Malamud, Cyrielle Opitom, Hagai Perets, J\"urgen Blum
https://arxiv.org/abs/2403.15644

A link between the size and composition of comets
All cometary nuclei that formed in the early Solar System incorporated radionuclides and therefore were subject to internal radiogenic heating. Previous work predicts that if comets have a pebble-pile structure internal temperature build-up is enhanced due to very low thermal conductivity, leading to internal differentiation. An internal thermal gradient causes widespread sublimation and migration of either ice condensates, or gases released from amorphous ice hosts during their crystallisation…

Decoherence-free algebras in quantum dynamics
Daniele Amato, Paolo Facchi, Arturo Konderak
https://arxiv.org/abs/2403.12926 https://a…

Decoherence-free algebras in quantum dynamics
In this Article we analyze the algebraic properties of the asymptotic dynamics of finite-dimensional open quantum systems in the Heisenberg picture. In particular, a natural product (Choi-Effros product) can be defined in the asymptotic regime. Motivated by this structure, we introduce a new space called the Choi-Effros decoherence-free algebra. Interestingly, this space is both a C* -algebra with respect to the composition product, and a B* -algebra with respect to the Choi-Effros product. Mor…

This https://arxiv.org/abs/2309.08306 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Cyclic nearly invariant subspaces for semigroups of isometries
In this paper, the structure of the nearly invariant subspaces for discrete semigroups generated by several (even infinitely many) automorphisms of the unit disc is described. As part of this work, the near $S^*$-invariance property of the image space $C_φ({\rm ker\, } T)$ is explored for composition operators $C_φ$, induced by inner functions $φ$, and Toeplitz operators $T$. After that, the analysis of nearly invariant subspaces for strongly continuous multiplication semigroups of isometrie…

Atmospheric parameters and abundances of cool red giant stars
Z. Dencs, A. Derekas, T. Mitnyan, M. F. Andersen, B. Cseh, F. Grundahl, V. Heged\H{u}s, J. Kov\'acs, L. Kriskovics, P. L. Palle, A. P\'al, L. Szigeti, Sz. M\'esz\'aros
https://arxiv.org/abs/2404.13176

Atmospheric parameters and abundances of cool red giant stars
Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to probe the farthest parts of our Galaxy. Our goal is to determine the chemical composition of 21 RGB stars with $T_{\mathrm{eff}}<4200$K selected from the APOGEE-2 DR17 database using new observations carried out with the spectrograph mounted on the 1-m telescope of the Hungarian Piszkéstető Observatory and the SONG spectrograph (R=770…

Linear isometries of Hol(D)
I. Chalendar, L. Oger, J. R. Partington
https://arxiv.org/abs/2402.14671 https://arxiv.org/pdf/2402.14671…

Linear isometries of Hol(D)
A complete characterisation is given of all the linear isometries of the Fréchet space of all holomorphic functions on the unit disc, when it is given one of the two standard metrics: these turn out to be weighted composition operators of a particular form. Operators similar to an isometry are also classified. Further, the larger class of operators isometric when restricted to one of the defining seminorms is identified. Finally, the spectra of such operators are studied.

Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy
Siyi Xu, Sherry Yeh, Laura. K. Rogers, Amy Steele, Erik Dennihy, Alexandra E. Doyle, P. Dufour, Beth L. Klein, Christopher J. Manser, Carl Melis, Tinggui Wang, Alycia J. Weinberger
https://arxiv.org/abs/2403.15794

Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy
The chemical composition of an extrasolar planet is fundamental to its formation, evolution and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets, by measuring the gas composition of the disrupted planetesimals around white dwarf stars. As a first attempt, we used the photo-ionization code Cloudy to model the circumstellar gas emission around a white dwarf Gaia J0611$-$6931 under some simplified assumptions. We fou…

This https://arxiv.org/abs/2007.03809 has been replaced.
link: https://scholar.google.com/scholar?q=a

Skeptic: Automatic, Justified and Privacy-Preserving Password Composition Policy Selection
The choice of password composition policy to enforce on a password-protected system represents a critical security decision, and has been shown to significantly affect the vulnerability of user-chosen passwords to guessing attacks. In practice, however, this choice is not usually rigorous or justifiable, with a tendency for system administrators to choose password composition policies based on intuition alone. In this work, we propose a novel methodology that draws on password probability distr…

As I just posted one of the photos of the day anyways, I thought I could share a bit of a background story with you as well.
A frosty and chill day - but I went there alone as I wanted to focus more on #photography than just #hiking the summit.

Embracing the Elements: A Frosty Photo Journey
Embark on a chilly adventure with me as I navigate the brisk winds and icy terrain of a winter hike. Join me as I brave the elements, capturing the raw beauty of snow-laden landscapes and gusty summits through the lens of my camera.

Linear isometries of Hol(D)
I. Chalendar, L. Oger, J. R. Partington
https://arxiv.org/abs/2402.14671 https://arxiv.org/pdf/2402.14671…

Linear isometries of Hol(D)
A complete characterisation is given of all the linear isometries of the Fréchet space of all holomorphic functions on the unit disc, when it is given one of the two standard metrics: these turn out to be weighted composition operators of a particular form. Operators similar to an isometry are also classified. Further, the larger class of operators isometric when restricted to one of the defining seminorms is identified. Finally, the spectra of such operators are studied.

Lithium Cepheid V708 Car with an unusual chemical composition
V. V. Kovtyukh, S. M. Andrievsky, K. Werner, S. A. Korotin, A. Y. Kniazev
https://arxiv.org/abs/2402.13072

Lithium Cepheid V708 Car with an unusual chemical composition
The purpose of this work is to spectroscopically analyse the classical Cepheid V708 Car. A preliminary check of the spectrum of V708 Car showed that this is a lithium-rich supergiant. We also found that V708 Car has an unusual chemical composition in that the abundances of various elements correlate with their condensation temperatures. We tried to find an explanation of this feature, which is unusual for classical Cepheids. For the spectroscopic analysis, we used methods based on the assumptio…

As I just posted one of the photos of the day anyways, I thought I could share a bit of a background story with you as well.
A frosty and chill day - but I went there alone as I wanted to focus more on #photography than just #hiking the summit.

Embracing the Elements: A Frosty Photo Journey
Embark on a chilly adventure with me as I navigate the brisk winds and icy terrain of a winter hike. Join me as I brave the elements, capturing the raw beauty of snow-laden landscapes and gusty summits through the lens of my camera.

This https://arxiv.org/abs/2403.07427 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

White dwarf systems: exoplanets and debris disks
Although there is abundant and diverse observational evidence in support of white dwarf stars hosting planets or debris disks which form in the catastrophic destruction of various planetary bodies, the key processes that explain these observations are still being intensely investigated. The study of white dwarf planetary systems offers a unique perspective on exo-solar composition, that cannot be obtained by any other means. This chapter describes the various observational techniques that are u…

I just came across the #FotoVorschlag tag about Gegenlicht (Back Light?) while Lightroom opened and I had the day of this hike still open.
It's been VERY windy and cold up there but luckily I was well prepared. A good jacket, balaclava, trousers and cap so only my eyes were uncovered
And #photography

I just came across the #FotoVorschlag tag about Gegenlicht (Back Light?) while Lightroom opened and I had the day of this hike still open.
It's been VERY windy and cold up there but luckily I was well prepared. A good jacket, balaclava, trousers and cap so only my eyes were uncovered
And #photography

Recently someone stumbled across one of my #pristineWinter photos and gave some really lovely feedback.
So I just Browser through those photos again and - yes, I really love them! I should pick up printing them again!
If you want a copy, it's currently available on FineArtAmerica as well.

Stand Strong by Franz Graf
Stand Strong Photograph by Franz Graf