Tootfinder

Lonely Little Red Dots: Challenges to the AGN-nature of little red dots through their clustering and spectral energy distributions
Mar\'ia de las Mercedes Carranza Escudero, Christopher J. Conselice, Nathan Adams, Thomas Harvey, Duncan Austin, Peter Behroozi, Leonardo Ferreira, Katherine Ormerod, Qiao Duan, James Trussler, Qiong Li, Lewi Westcott, Rogier A. Windhorst, Dan Coe, Seth H. Cohen, Cheng Cheng, Simon P. Driver, Brenda Frye, Lukas J. Furtak, Norman A. Grogin, Nimish P. Hat…

Lonely Little Red Dots: Challenges to the AGN-nature of little red dots through their clustering and spectral energy distributions
Observations with the James Webb Space Telescope (JWST) reveal a previously unseen population of compact red objects, known as ``little red dots`` (LRDs). We study a new photometrically selected sample of 124 LRDs in the redshift range $z$ $\sim$ 3 - 10 selected from NIRCam coverage of the CEERS, NEP-TDF, JADES and JEMS surveys. For JADES, the NEP-TDF and CEERS, we compare SED models with and without AGN components and analyse the impact of an AGN component on the goodness of fit using the Baye…

This https://arxiv.org/abs/2408.04094 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On endosplit $p$-permutation resolutions and Broué's conjecture for $p$-solvable groups
Endosplit $p$-permutation resolutions play an instrumental role in verifying Broué's abelian defect group conjecture in numerous cases. In this article, we give a complete classification of endosplit $p$-permutation resolutions and reduce the question of Galois descent of an endosplit $p$-permutation resolution to the Galois descent of the module it resolves. This is shown using techniques from the study of endotrivial complexes, the invertible objects of the bounded homotopy category of $p$-p…

Exploring black hole shadows in axisymmetric spacetimes with coordinate-independent methods and neural networks
Temurbek Mirzaev, Bobomurat Ahmedov, Cosimo Bambi
https://arxiv.org/abs/2507.02520

Exploring black hole shadows in axisymmetric spacetimes with coordinate-independent methods and neural networks
The study of black hole shadows provides a powerful tool for testing the predictions of general relativity and exploring deviations from the standard Kerr metric in the strong gravitational field regime. Here, we investigate the shadow properties of axisymmetric gravitational compact objects using a coordinate-independent formalism. We analyze black hole shadows in various spacetime geometries, including the Kerr, Taub-NUT, $γ$, and Kaluza-Klein metrics, to identify distinctive features that c…

This https://arxiv.org/abs/2504.08884 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The role of wind asphericity in dynamical friction
Dynamical friction (DF) may affect the dynamics of stars moving through dense media. This is the case for stars and compact objects (COs) crossing active galactic nuclei (AGN) discs, stellar clusters, and common envelopes (CE), driving stellar migration. DF may decelerate the moving stellar object and may also, under certain conditions, produce an acceleration. In this paper, we study the DF and its effects in the interaction between a star and the ambient gaseous medium through a set of two-di…

Protoplanetary Disk Survival Time-scales: A Blind Survey of Young Clusters up to 100 Myr in the Solar Vicinity
Gregory Mathews Ben, Jessy Jose, Jes\'us Hern\'andez
https://arxiv.org/abs/2507.01619

Protoplanetary Disk Survival Time-scales: A Blind Survey of Young Clusters up to 100 Myr in the Solar Vicinity
We study the protoplanetary disk lifetimes using a large sample of young stellar objects in nearby clusters. To investigate the final phase of disk dissipation, we selected 32 clusters, located within 500 pc and aged between 1 and 100 Myr, with membership determined using Gaia data. The Age and mass information of the sources are obtained through spectral energy distribution (SED) analysis and using evolutionary models of various ages. Using the IR data from 2MASS and WISE catalogues, we employ…

MINDS: The very low-mass star and brown dwarf sample. Detections and trends in the inner disk gas
A. M. Arabhavi, I. Kamp, Th. Henning, E. F. van Dishoeck, H. Jang, L. B. F. M. Waters, V. Christiaens, D. Gasman, I. Pascucci, G. Perotti, S. L. Grant, M. G\"udel, P. -O. Lagage, D. Barrado, A. Caratti o Garatti, F. Lahuis, T. Kaeufer, J. Kanwar, M. Morales-Calder\'on, K. Schwarz, A. D. Sellek, B. Tabone, M. Temmink, M. Vlasblom, P. Patapis

MINDS: The very low-mass star and brown dwarf sample. Detections and trends in the inner disk gas
Planet-forming disks around brown dwarfs and very low-mass stars (VLMS) are on average less massive and are expected to undergo faster radial solid transport than their higher mass counterparts. Spitzer had detected C$_2$H$_2$, CO$_2$ and HCN around these objects. With better sensitivity and spectral resolving power, JWST recently revealed incredibly carbon-rich spectra from such disks. A study of a larger sample of objects is necessary to understand how common such carbon-rich inner disk regio…

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Protein folding classes - High-dimensional geometry of amino acid composition space revisited
Boryeu Mao
https://arxiv.org/abs/2506.01857 https://

Protein folding classes - High-dimensional geometry of amino acid composition space revisited
In this study, the distributions of protein folding classes of experimentally determined structures from a legacy dataset and a comprehensive database SCOPe are modeled with precise geometric objects as convex polytopes in the high-dimensional amino acid composition space. This is a follow-up of a previous non-statistical, geometry-motivated modeling of protein classes with ellipsoidal models, which are superseded presently in three important respects: (1) as a paradigm shift descriptive 'distr…

Symport/Antiport P Systems with Membrane Separation Characterize P^(#P)
Vivien Ducros, Claudio Zandron
https://arxiv.org/abs/2507.01657

Symport/Antiport P Systems with Membrane Separation Characterize P^(#P)
Membrane systems represent a computational model that operates in a distributed and parallel manner, inspired by the behavior of biological cells. These systems feature objects that transform within a nested membrane structure. This research concentrates on a specific type of these systems, based on cellular symport/antiport communication of chemicals. Results in the literature show that systems of this type that also allow cell division can solve PSPACE problems. In our study, we investigate…

Computing Path Signature Varieties in Macaulay2
Carlos Am\'endola, Angelo El Saliby, Felix Lotter, Oriol Reig Fit\'e
https://arxiv.org/abs/2506.01429

Computing Path Signature Varieties in Macaulay2
The signature of a path is a non-commutative power series whose coefficients are given by certain iterated integrals over the path coordinates. This series almost uniquely characterizes the path up to translation and reparameterization. Taking only fixed degree parts of these series yields signature tensors. We introduce the Macaulay2 package $\texttt{PathSignatures}$ to simplify the study of these interesting objects for piecewise polynomial paths. It allows for the creation and manipulation o…

This https://arxiv.org/abs/2001.09029 has been replaced.
link: https://scholar.google.com/scholar?q=a

Rewriting Structured Cospans
To support the study of compositional networks, we further develop the formalism of structured cospans. To enable rewriting, we introduce a category whose objects are structured cospans and characterize conditions under which this category is a topos or is adhesive. We then define a structured cospan grammar and language, using a 2-category framework. As an application, we demonstrate that for various sorts of graphs, hypergraphs, and Petri nets, any grammar induces the same language as its cor…

Dichoptic Opacity: Managing Occlusion in Stereoscopic Displays via Dichoptic Presentation
George Bell (Newcastle University), Alma Cantu (Newcastle University)
https://arxiv.org/abs/2506.22841

Dichoptic Opacity: Managing Occlusion in Stereoscopic Displays via Dichoptic Presentation
Adjusting transparency is a common method of mitigating occlusion but is often detrimental for understanding the relative depth relationships between objects as well as removes potentially important information from the occluding object. We propose using dichoptic opacity, a novel method for occlusion management that contrasts the transparency of occluders presented to each eye. This allows for better simultaneous understanding of both occluder and occluded. A user study highlights the techniqu…

Finding Similar Objects and Active Inference for Surprise in Numenta Neocortex Model
Hajime Kawakami
https://arxiv.org/abs/2506.21554 https://

Finding Similar Objects and Active Inference for Surprise in Numenta Neocortex Model
Jeff Hawkins and his colleagues in Numenta have proposed the thousand-brains system. This is a model of the structure and operation of the neocortex and is under investigation as a new form of artificial intelligence. In their study, learning and inference algorithms running on the system are proposed, where the prediction is an important function. The author believes that one of the most important capabilities of the neocortex in addition to prediction is the ability to make association, that …

Non-local random deposition models for earthquakes and energy propagation
Philippe Carmona, Fran\c{c}ois P\'etr\'elis, Nicolas P\'etr\'elis
https://arxiv.org/abs/2506.23853

Non-local random deposition models for earthquakes and energy propagation
We investigate a new class of non-local random deposition models, initially introduced by physicists to study the field of mechanical constraints (stress) applied along a line or on a given area located in a seismic zone. The non-local features are twofold. First, the falling objects have random and heavy-tailed dimensions. Second, the locations where the objects are falling are at least for some of the models that we consider, depending on the shape of the surface before deposition. We conside…

DexMachina: Functional Retargeting for Bimanual Dexterous Manipulation
Zhao Mandi, Yifan Hou, Dieter Fox, Yashraj Narang, Ajay Mandlekar, Shuran Song
https://arxiv.org/abs/2505.24853

DexMachina: Functional Retargeting for Bimanual Dexterous Manipulation
We study the problem of functional retargeting: learning dexterous manipulation policies to track object states from human hand-object demonstrations. We focus on long-horizon, bimanual tasks with articulated objects, which is challenging due to large action space, spatiotemporal discontinuities, and embodiment gap between human and robot hands. We propose DexMachina, a novel curriculum-based algorithm: the key idea is to use virtual object controllers with decaying strength: an object is first…

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 works of M. Saorin and A. Zvonoreva on gluing (co)silting objects and of L. Angeler Hugel, R. Laking, J. Stovicek and J. Vitoria on mutating (co)silting objects, we first study further on gluing pure-injective cosilting objects in algebraically compactly generated triangulated categories and gluing cosilting complexes in the derived categories of rings. Then we discuss the compatibility of cosilting gluing and cosilting mutation.

Yang-Baxter Equation and Related Algebraic Structures
Valeriy Bardakov, Mohamed Elhamdadi, Mahender Singh
https://arxiv.org/abs/2506.23175 https://

Yang-Baxter Equation and Related Algebraic Structures
In the 1990s, Drinfel'd proposed the study of set-theoretical solutions to the quantum Yang-Baxter equation, initiating a line of research that has since garnered substantial attention and led to notable developments in algebra, low-dimensional topology, and related areas. This monograph offers a concise introduction to the algebraic theory of such solutions, focusing on key structures including skew braces, quandles, racks, and Rota-Baxter groups, which have emerged as central objects in this …

This https://arxiv.org/abs/2502.20923 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Spinning boson stars in nonlinear sigma models and Universal Relations
Boson stars are hypothetical compact objects derived from solutions of a self-gravitating complex scalar field. In this study, we extend the traditional models by generalizing the kinetic term of the scalar field to that of a nonlinear sigma model. Concretely, we obtain spinning boson star solutions for a family of models parametrized by the curvature of their two-dimensional target manifold, as well as for various self-interaction potentials. We derive the global properties and multipolar stru…

Collective effects of neighbouring melting ice objects
Sof\'ia Angriman, Detlef Lohse, Roberto Verzicco, Sander G. Huisman
https://arxiv.org/abs/2506.16926

Collective effects of neighbouring melting ice objects
We present a study on the melting dynamics of neighbouring ice bodies by means of idealised simulations, focusing on collective effects. Two vertically aligned, square-shaped, and equally sized ice objects (size on the order of centimetres) are immersed in quiescent fresh water at a temperature of 20 °C. By performing two-dimensional direct numerical simulations, and using the phase-field method to model the phase change, the collective melting of these objects is studied. While the melting of…

On jet schemes of determinantal varieties
Yifan Chen, Huaiqing Zuo
https://arxiv.org/abs/2506.22898 https://arxiv.org/pdf/2506.22898

On jet schemes of determinantal varieties
Determinantal varieties are important objects of study in algebraic geometry. In this paper, we will investigate them using the jet scheme approach. We have found a new connection for the Hilbert series between a determinantal variety and its jet schemes. We denote the $k$-th order jet scheme of the determinantal variety defined by $r$-minors in an $m \times n$ matrix as $\mathscr{L}^{m,n}_{r,k}$. For the special case where $m$, $n$, and $r$ are equal, and $m$ and $r$ are 3 while $k$ is 1, we e…

The Phase Space of Low-Mass Binary Compact Objects from LIGO-Virgo-KAGRA Catalog: Hints on the Chances of Different Formation Scenarios
Samsuzzaman Afroz, Suvodip Mukherjee
https://arxiv.org/abs/2505.22739

The Phase Space of Low-Mass Binary Compact Objects from LIGO-Virgo-KAGRA Catalog: Hints on the Chances of Different Formation Scenarios
Gravitational wave (GW) observations have significantly advanced our understanding of binary compact object (BCO) formation, yet directly linking these observations to specific formation scenarios remains challenging. The BCO phase space provides a robust and data-driven approach to discover the likely formation scenarios of these binaries. In this study, we expand the previously introduced binary black hole phase-space technique to encompass low-mass compact objects (LMCOs), establishing a nov…

This https://arxiv.org/abs/2405.08837 has been replaced.
initial toot: https://mastoxiv.page/@a…

Deciphering Solar Cycle Influence on Long-Term Orbital Deterioration of Low-Earth Orbiting Space Debris
The rapid increase in the number of space debris represents a substantial threat to the sustained viability of space operations and underscores the importance of understanding long-term drivers of orbital decay. This first of its kind study examines the long-term impact of solar activity on the orbital decay of 17 LEO debris objects across Solar Cycles 22, 23, and 24 using Two-Line Element (TLE) data spanning these three cycles. Analysis of TLE-derived decay profiles, in conjunction with sunspo…

Infrared Variability of Carbon Stars in the LMC Observed with NEOWISE-R
Kyung-Won Suh
https://arxiv.org/abs/2506.22100 https://arxiv.…

Infrared Variability of Carbon Stars in the LMC Observed with NEOWISE-R
We investigate the infrared variability of carbon stars in the Large Magellanic Cloud (LMC). Our sample consists of 11,134 carbon stars identified in both visual and infrared bands. Among these, 1,184 objects are known Mira variables based on the Optical Gravitational Lensing Experiment III (OGLE-III) observations. We study the infrared variability of the entire sample using the Wide-field Infrared Survey Explorer (WISE) photometric data spanning the past 16 years, including the AllWISE multiep…

A JWST study of CO$_2$ on the satellites of Saturn
Michael E. Brown, Samantha K. Trumbo, Matthew Belyakov, M. Ryleigh Davis, Ashma Pandaya
https://arxiv.org/abs/2506.19921

A JWST study of CO$_2$ on the satellites of Saturn
Solid state CO$_2$ has been detected throughout the outer solar system, even at temperatures where crystalline CO$_2$ is unstable, requiring that the CO$_2$ be trapped in a separate host material. The Saturnian satellites provide an ideal laboratory for the study of this trapped CO$_2$, allowing us to examine objects with identical insolation, but with a range of environments, ice exposure, organic abundance, and formation locations. Here, we present JWST spectra of 8 mid-sized satellites of Sa…

An Axiomatization of the Random Priority Rule
Christian Basteck
https://arxiv.org/abs/2506.17997 https://arxiv.org/pdf/2506.17997

An Axiomatization of the Random Priority Rule
We study the problem of assigning indivisible objects to agents where each is to receive at most one. To ensure fairness in the absence of monetary compensation, we consider random assignments. Random Priority, also known as Random Serial Dictatorship, is characterized by equal-treatment-of-equals, ex-post efficiency and probabilistic (Maskin) monotonicity -- whenever preferences change so that a given deterministic assignment is ranked weakly higher by all agents, the probability of that assig…

Trinitary algebras
V. A. Vassiliev
https://arxiv.org/abs/2506.12865 https://arxiv.org/pdf/2506.12865…

Trinitary algebras
A {\em trinitary algebra} is any subalgebra of the space of smooth functions $f: M \to {\mathbb R}$ that is distinguished in this space by finitely many linear conditions of the form $f(x_i) = f(\tilde x_i) = f(\hat x_i)$, where $x_i, \tilde x_i,$ and $ \hat x_i $ are distinct points in $ M$, $i=1, \dots, k$, or is approximated by such subalgebras. These algebras naturally arise in the study of discriminant varieties, i.e., the spaces of singular geometric objects, in theories where the propert…

Hearing Hands: Generating Sounds from Physical Interactions in 3D Scenes
Yiming Dou, Wonseok Oh, Yuqing Luo, Antonio Loquercio, Andrew Owens
https://arxiv.org/abs/2506.09989

Hearing Hands: Generating Sounds from Physical Interactions in 3D Scenes
We study the problem of making 3D scene reconstructions interactive by asking the following question: can we predict the sounds of human hands physically interacting with a scene? First, we record a video of a human manipulating objects within a 3D scene using their hands. We then use these action-sound pairs to train a rectified flow model to map 3D hand trajectories to their corresponding audio. At test time, a user can query the model for other actions, parameterized as sequences of hand pos…

Complex harmonic maps and rank 2 higher Teichm\"uller theory
Christian El Emam, Nathaniel Sagman
https://arxiv.org/abs/2506.11746 https://

Complex harmonic maps and rank 2 higher Teichmüller theory
We initiate and develop the theory of complex harmonic maps to holomorphic Riemannian symmetric spaces, which we make use of to study complex analytic aspects of higher Teichmüller theory, with a focus on rank $2$ Hitchin components. Complex harmonic maps lead to various generalizations of objects from the theory of Higgs bundles; for instance, the Hitchin fibration, cyclic Higgs bundles, and the affine Toda equations. Beyond such generalizations, we also find a relation between complex harm…

This https://arxiv.org/abs/2406.11369 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCG_…

Approximation Algorithms for Smallest Intersecting Balls
We study a general smallest intersecting ball problem and its soft-margin variant in high-dimensional Euclidean spaces for input objects that are compact and convex. These two problems link and unify a series of fundamental problems in computational geometry and machine learning, including smallest enclosing ball, polytope distance, intersection radius, $\ell_1$-loss support vector machine, $\ell_1$-loss support vector data description, and so on. Leveraging our novel framework for solving zero…

Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit timing variation analysis of Brown Dwarfs around Solar-type Stars
Wenqin Wang, Xinyue Ma, Zhangliang Chen, Cong Yu, Shangfei Liu, Bo Ma
https://arxiv.org/abs/2505.21270

Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit timing variation analysis of Brown Dwarfs around Solar-type Stars
Transit timing variation (TTV) is a useful tool for studying the orbital properties of transiting objects. However, few TTV studies have been done on transiting brown dwarfs (BDs) around solar-type stars. Here we study the long-term TTV of a population of close BD companions around solar-type stars using TESS data. We use the measured orbital period change rate to constrain the tidal interaction strength between the host star and the BD companion and put limits on the destruction timescale of t…

A Point Cloud Completion Approach for the Grasping of Partially Occluded Objects and Its Applications in Robotic Strawberry Harvesting
Ali Abouzeid, Malak Mansour, Chengsong Hu, Dezhen Song
https://arxiv.org/abs/2506.14066

A Point Cloud Completion Approach for the Grasping of Partially Occluded Objects and Its Applications in Robotic Strawberry Harvesting
In robotic fruit picking applications, managing object occlusion in unstructured settings poses a substantial challenge for designing grasping algorithms. Using strawberry harvesting as a case study, we present an end-to-end framework for effective object detection, segmentation, and grasp planning to tackle this issue caused by partially occluded objects. Our strategy begins with point cloud denoising and segmentation to accurately locate fruits. To compensate for incomplete scans due to occlu…

Contactless Precision Steering of Particles in a Fluid inside a Cube with Rotating Walls
Lucas Amoudruz, Petr Karnakov, Petros Koumoutsakos
https://arxiv.org/abs/2506.15958

Contactless Precision Steering of Particles in a Fluid inside a Cube with Rotating Walls
Contactless manipulation of small objects is essential for biomedical and chemical applications, such as cell analysis, assisted fertilisation, and precision chemistry. Established methods, including optical, acoustic, and magnetic tweezers, are now complemented by flow control techniques that use flow-induced motion to enable precise and versatile manipulation. However, trapping multiple particles in fluid remains a challenge. This study introduces a novel control algorithm capable of steering…

Grasp Prediction based on Local Finger Motion Dynamics
Dimitar Valkov, Pascal Kockwelp, Florian Daiber, Antonio Kr\"uger
https://arxiv.org/abs/2506.10818

Grasp Prediction based on Local Finger Motion Dynamics
The ability to predict the object the user intends to grasp offers essential contextual information and may help to leverage the effects of point-to-point latency in interactive environments. This paper explores the feasibility and accuracy of real-time recognition of uninstrumented objects based on hand kinematics during reach-to-grasp actions. In a data collection study, we recorded the hand motions of 16 participants while reaching out to grasp and then moving real and synthetic objects. Our…

VLBA astrometry of PSRs B0329 54 and B1133 16: Improved pulsar distances and comparison of global ionospheric models
Ashish Kumar, Adam T. Deller, Pankaj Jain, Javier Mold\'on
https://arxiv.org/abs/2506.14368

VLBA astrometry of PSRs B0329+54 and B1133+16: Improved pulsar distances and comparison of global ionospheric models
Very long baseline interferometry (VLBI) astrometry is used to determine the three-dimensional position and proper motion of astronomical objects. A typical VLBI astrometric campaign generally includes around ten observations, making it challenging to characterise systematic uncertainties. Our study on two bright pulsars, B0329+54 and B1133+16, involves analysis of broadband Very Long Baseline Array (VLBA) data over $\sim30$ epochs (spanning approximately $3.5\, {\rm years}$). This extended dat…

This https://arxiv.org/abs/2503.11653 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csOH_…

The Junction of Immersive Analytics and Virtual Reconstructions -- A Case Study on the Mausoleum of Emperor Maxentius
Virtual Archaeology has significantly evolved over the last decades through advancements in data acquisition and representation by, e.g., improved data recording technologies and virtual reality devices. Immersive environments provide novel ways to present historical events or objects with high visual quality for both, the general public as well as researchers. Here, we examine how the emerging field of Immersive Analytics can contribute to enhancing the understanding and exploration of archaeo…

Neutron Star Radial Perturbations for Causal, Viscous, Relativistic Fluids
Daniel A. Caballero, Nicol\'as Yunes
https://arxiv.org/abs/2506.09149 https:…

Neutron Star Radial Perturbations for Causal, Viscous, Relativistic Fluids
Which of the multiple models of causal and stable relativistic viscous fluids that have been developed is best suited to describe neutron stars? The modeling of out-of-equilibrium effects in these relativistic, astrophysical objects must be one with care, as simple Newtonian intuition fails to remain causal. Radial stability of neutron stars is one of the primary conditions for the viability of such out-of-equilibrium models. In this paper, we study radial perturbations of neutron stars for the…

Submillimeter and Mid-Infrared Variability of Young Stellar Objects in the M17 HII Region
Zhiwei Chen, Doug Johnstone, Carlos Contreras Pe\~na, Jeong-Eun Lee, Sheng-Yuan Liu, Gregory Herczeg, Steve Mairs, Geumsook Park, Kee-Tae Kim, Mi-Ryang Kim, Keping Qiu, Yao-Te Wang, Xu Zhang, Megan Reiter, the JCMT Transient Team
https://ar…

Submillimeter and Mid-Infrared Variability of Young Stellar Objects in the M17 HII Region
We conducted a comprehensive analysis of young stellar object (YSO) variability at submillimeter and mid-infrared (mid-IR) wavelengths for the M\,17 \ion{H}{2} region, using 3.5 years monitoring data from the JCMT Transient Survey at $450$ and $850\,μ$m and 9 years mid-IR monitoring data from the NEOWISE mission. Our study encompasses observations of 198 and 164 bright submillimeter peaks identified within the deep JCMT coadded maps at 450 and $850\,μ$m, and 66 YSOs seen by NEOWISE W2 that we…

ACM tilting bundles on a Geigle-Lenzing projective plane of type $(2,2,2,p)$
Jianmin Chen, Shiquan Ruan, Weikang Weng
https://arxiv.org/abs/2506.13376 http…

ACM tilting bundles on a Geigle-Lenzing projective plane of type $(2,2,2,p)$
Let $\mathbb{X}$ be a Geigle-Lenzing projective plane of type $(2,2,2,p)$ and $\mathsf{coh} \mathbb{X}$ the category of coherent sheaves on $\mathbb{X}$. This paper is devoted to study ACM tilting bundles over $\mathbb{X}$, that is, tilting objects in the derived category $\mathsf{D}^{\rm b}(\mathsf{coh} \, \mathbb{X})$ that are also ACM bundles. We show that a tilting bundle consisting of line bundles is the $2$-canonical tilting bundle up to degree shift. We also provide a program to construc…

Superradiant amplification by rotating viscous compact objects
Jaime Redondo-Yuste, Vitor Cardoso
https://arxiv.org/abs/2506.13850 https://

Superradiant amplification by rotating viscous compact objects
We study fluctuations of rotating viscous stars, using the causal relativistic hydrodynamics of Bemfica, Disconzi, Kovtun, and Noronha. We derive, in a slow-rotation approximation, a coupled system of equations describing the propagation of axial gravitational waves through the star, which couple to internal viscous modes. We show that rotating viscous stars amplify incoming low-frequency gravitational waves, a phenomenon which we argue to be universal. Superradiant amplification does not seem …

Precise Timing Analysis of Four Magnetic Cataclysmic Variables with TESS
Srinivas M Rao, Jeewan C Pandey, Nikita Rawat, Arti Joshi, Ajay Kumar Singh
https://arxiv.org/abs/2506.04371

Precise Timing Analysis of Four Magnetic Cataclysmic Variables with TESS
We analysed high time-resolution optical photometric data from the Transiting Exoplanet Survey Satellite (TESS) to study the timing behaviour of four intermediate polar-like objects, namely, V1460 Her, 1RXS J045707.4+452751, Swift J0958.0-4208, and V842 Cen. In the case of V1460 Her, we refined the measurement of its orbital period. Long-term observations suggest a gradual decrease in the orbital period of V1460 Her, and the stable light curve during the TESS observations indicates its quiescen…

This https://arxiv.org/abs/2407.02725 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Derived preprojective algebras and spherical twist functors
We study silting objects over derived preprojective algebras of acyclic quivers by giving a direct relationship between silting objects, spherical twist functors and mutations. Especially, for a Dynkin quiver, we establish a bijection between the elements of the braid group and the set of isomorphism classes of basic silting objects over the derived preprojective algebra.

Towards Biosignals-Free Autonomous Prosthetic Hand Control via Imitation Learning
Kaijie Shi, Wanglong Lu, Hanli Zhao, Vinicius Prado da Fonseca, Ting Zou, Xianta Jiang
https://arxiv.org/abs/2506.08795

Towards Biosignals-Free Autonomous Prosthetic Hand Control via Imitation Learning
Limb loss affects millions globally, impairing physical function and reducing quality of life. Most traditional surface electromyographic (sEMG) and semi-autonomous methods require users to generate myoelectric signals for each control, imposing physically and mentally taxing demands. This study aims to develop a fully autonomous control system that enables a prosthetic hand to automatically grasp and release objects of various shapes using only a camera attached to the wrist. By placing the ha…

JWST Insights into Narrow-line Little Red Dots
Zijian Zhang, Linhua Jiang, Weiyang Liu, Luis C. Ho, Kohei Inayoshi
https://arxiv.org/abs/2506.04350 https:/…

JWST Insights into Narrow-line Little Red Dots
James Webb Space Telescope (JWST) has revealed a population of red and compact objects with a unique V-shape SED at z >= 4 known as Little Red Dots (LRDs). Most of the LRDs with existing spectral observations exhibit broad Balmer lines and are thus likely to host active galactic nuclei (AGNs). Here we present a study of LRDs with no broad H-alpha component. Our sample consists of five LRDs at z~5 with H-alpha line widths of about 250 km/s. They are selected from 32 LRDs that have NIRSpec high- …

Periodic equatorial orbits in a black bounce scenario
Anderson Bragado, Gonzalo J. Olmo
https://arxiv.org/abs/2506.15600 https://arxi…

Periodic equatorial orbits in a black bounce scenario
We study equatorial closed orbits in a popular black bounce model to see if the internal structure of these objects could lead to peculiar observable features. Paralleling the analysis of the Schwarzschild and Kerr metrics, we show that in the black bounce case each orbit can also be associated with a triplet of integers which can then be used to construct a rational number characterizing each periodic orbit. When the black bounce solution represents a traversable wormhole, we show that the pre…

A Categorical Perspective on Braid Representations
P. P. Martin, E. C. Rowell, F. Torzewska
https://arxiv.org/abs/2506.07950 https://…

A Categorical Perspective on Braid Representations
We study categories whose objects are the braid representations, that is, strict monoidal functors from the braid category $B$ to the category of matrices $Mat$. Braid representations are equivalent to solutions to the (constant) Yang-Baxter equation. So their classification problems are also equivalent. We consider both the categories $MoonFun(B,Mat)$ whose morphisms are natural transformations and the category $MonFun(B,Mat)$ whose morphisms are the monoidal natural transformations. This cate…

Bayesian luminosity function estimation in multidepth datasets with selection effects: a case study for $3<z<5$ Ly$\alpha$ emitters
Davide Tornotti, Matteo Fossati, Michele Fumagalli, Davide Gerosa, Lorenzo Pizzuti, Fabrizio Arrigoni Battaia
https://arxiv.org/abs/2506.10083

Bayesian luminosity function estimation in multidepth datasets with selection effects: a case study for $3
We present a hierarchical Bayesian framework designed to infer the luminosity function of any class of objects by jointly modeling data from multiple surveys with varying depth, completeness, and sky coverage. Our method explicitly accounts for selection effects and measurement uncertainties (e.g., in luminosity) and could be generalized to any extensive quantity, such as mass. We validate the model using mock catalogs, recovering how deep data reaching $\gtrsim 1.5$ dex below a characteristic …