Tootfinder

Observation of relativistic domain wall motion in amorphous ferrimagnets
Pietro Diona, Luca Maranzana, Sergey Artyukhin, Giacomo Sala
https://arxiv.org/abs/2508.13950 https://…

Observation of relativistic domain wall motion in amorphous ferrimagnets
Domain walls in magnetic materials are sine-Gordon solitons characterized by relativistic kinematics, with the maximum spin-wave group velocity setting a limit for the domain wall speed and hence the highest operation frequency of magnetic devices. This relativistic regime has been observed only in crystalline iron-garnet ferrimagnets but is in general expected in many magnetic materials. In particular, amorphous rare-earth -- transition metal ferrimagnets should exhibit relativistic effects be…

Denisovan skull discovered
https://www.science.org/content/article/dragon-man-skull-belongs-mysterious-human-relative

Functional inference on deviations from General Relativity
Costantino Pacilio, Riccardo Buscicchio
https://arxiv.org/abs/2507.13454 https://

Functional inference on deviations from General Relativity
Extensions of general relativity often predict modifications to gravitational waveform morphology that depend functionally on source parameters, such as the masses and spins of coalescing black holes. However, current analyses of strong-field gravity lack robust, data-driven methods to infer such functional dependencies. In this work, we introduce GRANITA, a non-perturbative, theory-agnostic framework to characterize parameter-dependent deviations from general relativity using Gaussian process …

Comparing Model-agnostic Feature Selection Methods through Relative Efficiency
Chenghui Zheng, Garvesh Raskutti
https://arxiv.org/abs/2508.14268 https://ar…

Comparing Model-agnostic Feature Selection Methods through Relative Efficiency
Feature selection and importance estimation in a model-agnostic setting is an ongoing challenge of significant interest. Wrapper methods are commonly used because they are typically model-agnostic, even though they are computationally intensive. In this paper, we focus on feature selection methods related to the Generalized Covariance Measure (GCM) and Leave-One-Covariate-Out (LOCO) estimation, and provide a comparison based on relative efficiency. In particular, we present a theoretical compar…

Necessary and sufficient conditions for relative controllability of discrete linear delay systems
Javad A. Asadzade, Nazim I. Mahmudov
https://arxiv.org/abs/2508.13336 https://

Necessary and sufficient conditions for relative controllability of discrete linear delay systems
In this paper, we investigate delayed linear difference systems and establish several fundamental results. We first provide a Kalman-type rank condition tailored for delayed linear difference systems. Furthermore, we construct the discrete Gramian matrix and prove its non-singularity, which is essential for analyzing system properties. Additionally, we obtain necessary and sufficient conditions ensuring the relative controllability of the system. Finally, we formulate the control function for e…

Suppression of two stream instability in relativistic electron-ion plasmas
Vivek Shrivastav, Mani K Chettri, Hemam D Singh, Rupak Mukherjee
https://arxiv.org/abs/2508.14362 http…

Suppression of two stream instability in relativistic electron-ion plasmas
This paper investigates the suppression of two stream instabilities in electron ion plasmas when the individual species attain relativistic velocities. This suppression of the growth rate of two stream instability is consistent even when the ions form a neutralizing background. It is found that the parameter space of the growth rate reasonably squeezes for relativistic electrons at higher plasma frequencies. We further report the suppression of the growth rate of the said instability as the ion…

Symmetrizing relativistic three-body partial wave amplitudes
Andrew W. Jackura, Nicholas C. Chambers, Ra\'ul A. Brice\~no
https://arxiv.org/abs/2507.14098

Symmetrizing relativistic three-body partial wave amplitudes
S matrix principles and symmetries impose constraints on three-particle scattering amplitudes, which can be formulated as a class of integral equations for their partial wave projections. However, these amplitudes are typically expressed in an asymmetric basis, where one of the initial and final state particles is singled out, and all quantum numbers are defined relative to this spectator. In this work, we show how to construct symmetric partial wave amplitudes, which have been symmetrized over…

Particle Injection in 3D Relativistic Magnetic Reconnection
Omar French, Gregory R. Werner, Dmitri A. Uzdensky
https://arxiv.org/abs/2508.14886 https://arx…

Particle Injection in 3D Relativistic Magnetic Reconnection
Relativistic magnetic reconnection has been proposed as an important nonthermal particle acceleration (NTPA) mechanism that generates power-law spectra and high-energy emissions. Power-law particle spectra are in general characterized by three parameters: the power-law index, the high-energy cutoff, and the low-energy cutoff (i.e., the injection energy). Particle injection into the nonthermal power law, despite also being a critical step in the NTPA chain, has received considerably less attenti…

On combination theorems and Bowditch boundaries of relatively hyperbolic TDLC groups
Swarnali Datta, Arunava Mandal, Ravi Tomar
https://arxiv.org/abs/2508.13038 https://

On combination theorems and Bowditch boundaries of relatively hyperbolic TDLC groups
Based on the work of Farb, Bowditch, and Groves-Manning on discrete relatively hyperbolic groups, we introduce an approach to relative hyperbolicity for totally disconnected locally compact (TDLC) groups. For compactly generated TDLC groups, we prove that this notion is equivalent to the one introduced by Arora-Pedroza. Let $G=A\ast_C B$ or $G=A\ast_C$ where $A$ and $B$ are relatively hyperbolic TDLC groups and $C$ is compact. We prove that $G$ is a relatively hyperbolic TDLC group and give a c…

Family Reunion
This weekend marks the 70th reunion of Albert Campbell Smith and Mary Susan Mallow's descendants in West Virginia. I take a nostalgic trip through familiar places, reflecting on family history and memories. I also wonder about my grandmother's estrangement from her relatives.
https://www.bobm…

Family Reunion – Bob Mueller
This weekend marks the 70th reunion of Albert Campbell Smith and Mary Susan Mallow's descendants in West Virginia. I take a nostalgic trip through familiar places, reflecting on family history and memories. I also wonder about my grandmother's estrangement from her relatives.