Tootfinder

Scattering angle in a Topological Star spacetime: a self-force approach
Massimo Bianchi, Donato Bini, Giorgio Di Russo
https://arxiv.org/abs/2506.04876 htt…

Scattering angle in a Topological Star spacetime: a self-force approach
We compute the scattering angle for a scalar neutral probe undergoing unbound motion around a Topological Star, including self-force effects. Moreover we identify the `electro-magnetic' source of the background as Papapetrou Field compatible with the isometries and characterize Topological Stars by studying their sectional curvature, geometric transport along special curves and the gravitational energy content in terms of the super-energy tensors.

Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
Yerong Xu, Luigi C. Gallo, Kouichi Hagino, James N. Reeves, Francesco Tombesi, Misaki Mizumoto, Alfredo Luminari, Adam G. Gonzalez, Ehud Behar, Rozenn Boissay-Malaquin, Valentina Braito, Pierpaolo Condo, Chris Done, Aiko Miyamoto, Ryuki Mizukawa, Hirokazu Odaka, Riki Sato, Atsushi Tanimoto, Makoto Tashiro, Tahir Yaqoob, Satoshi Yamada

Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
Multiple clumpy wind components ($v_{out}\sim0.2-0.3c$) in the luminous quasar PDS 456 have recently been resolved by XRISM in the Fe-K band for the first time. In this paper, we investigate the structure of ultra-fast outflows (UFOs) using coordinated observations from XRISM, XMM-Newton, and NuSTAR, along with the self-consistently calculated photoionization model \texttt{PION}. Our results reveal a stratified ionization structure likely driven by the radiation field, characterized by a relati…

COSMOS-Web: Estimating Physical Parameters of Galaxies Using Self-Organizing Maps
Fatemeh Abedini, Ghassem Gozaliasl, Akram Hasani Zonoozi, Atousa Kalantari, Maarit Korpi-Lagg, Olivier Ilbert, Hollis B. Akins, Natalie Allen, Rafael C. Arango-Toro, Caitlin M. Casey, Nicole E. Drakos, Andreas L. Faisst, Carter Flayhart, Maximilien Franco, Santosh Harish, Hossein Hatamnia, Jeyhan S. Kartaltepe, Ali Ahmad Khostovan, Anton M. Koekemoer, Vasily Kokorev, Rebecca L. Larson, Gavin Leroy, Daizho…

COSMOS-Web: Estimating Physical Parameters of Galaxies Using Self-Organizing Maps
The COSMOS-Web survey, with its unparalleled combination of multiband data -- particularly near-infrared imaging from JWST's NIRCam (F115W, F150W, F277W, and F444W), provides a transformative dataset reaching down to approximately 28th magnitude (F444W) for studying galaxy evolution. In this work, we employ Self-Organizing Maps (SOMs), an unsupervised machine learning method, to estimate key physical parameters of galaxies, redshift, stellar mass, star formation rate (SFR), specific SFR (sSFR),…

Coherent polarization self-rotation
Roy Shaham, Orr Meron, Or Katz, Dimitry Yankelev, Ofer Firstenberg
https://arxiv.org/abs/2506.01892 https://

Coherent polarization self-rotation
We introduce and study coherent polarization self-rotation (CPSR), a two-photon light-matter interaction in dense alkali-metal vapors that enables both narrowband optical spectroscopy of magnetic transitions and coherent coupling between light and collective atomic spins. Unlike conventional polarization self-rotation, CPSR requires initial spin polarization and a predominantly linearly polarized probe. It operates efficiently even in optically thick vapors with high buffer-gas pressure, rapid …

The incidence of magnetic cataclysmic variables can be explained by the late appearance of white dwarf magnetic fields
Matthias R. Schreiber, Diogo Belloni
https://arxiv.org/abs/2505.24153

The incidence of magnetic cataclysmic variables can be explained by the late appearance of white dwarf magnetic fields
Assuming that white dwarf (WD) magnetic fields are generated by a crystallization- and rotation-driven dynamo, the impact of the late appearance of WD magnetic fields in cataclysmic variables (CVs) has been shown to potentially solve several long-standing problems of CV evolution. However, recent theoretical works show that the dynamo idea might not be viable and that the late appearance of WD magnetic fields might be an age effect rather than related to the cooling of the core of the WD. We in…

Læser om jer andres ferieplaner og er noget misundelig på jer der ikke skal særlig meget. Det trænger jeg også til, men vi får familiebesŸg fra udlandet (hyggeligt, men også krævende når det er fem dage med andre i ens hjem) og skal derefter med til Blåvand i en uge (det bliver sikkert fantastisk på mange måder - men jeg kan så godt lide at have tid for mig selv hvor jeg ikke skal noget).
Når de drager retur til Frankrig, dog, så har jeg en uge hvor kun YngsteSŸn og jeg er hjemme, juhuu!…

Self-organization of earth's inner magnetospheric multi-ion plasma
Usman Shazad, M. Iqbal
https://arxiv.org/abs/2507.00734 https://

Self-organization of earth's inner magnetospheric multi-ion plasma
The self-organization of a magnetized multi-ion plasma, composed of inertialess electrons and inertial H+, He+, and O+ ions, leads to the formation of quadruple Beltrami (QB) field structures. The QB self-organized state is a linear combination of four single Beltrami fields, and it is a non-force-free state that shows strong magnetofluid coupling. Moreover, the QB state is characterized by four relaxed state structures of different length scales. The investigation reveals that the generalized …

This https://arxiv.org/abs/2505.19636 has been replaced.
initial toot: https://mastoxiv.page/@a…

Longitudinal magnetoconductivity in chiral multifold semimetals exemplified by pseudospin-1 nodal points
We embark on computing the longitudinal magnetoconductivity within the semiclassical Boltzmann formalism, where an isotropic triple-point semimetal (TSM) is subjected to collinear electric ($\boldsymbol E $) and magnetic ($\boldsymbol B$) fields. Except for the Drude part, the $B$-dependence arises exclusively from topological properties like the Berry curvature and the orbital magnetic moment. We solve the Boltzmann equations exactly in the linear-response regime, applicable in the limit of we…

Vanishing Vertical Viscosity in Two-Dimensional Anisotropic Navier-Stokes Equations with No-Slip Boundary Conditions: An $L^p$ result
Chongsheng Cao, Yanqiu Guo
https://arxiv.org/abs/2507.02794

Vanishing Vertical Viscosity in Two-Dimensional Anisotropic Navier-Stokes Equations with No-Slip Boundary Conditions: An $L^p$ result
This paper studies the inviscid limit problem for the two-dimensional Navier-Stokes equations with anisotropic viscosity. The fluid is assumed to be bounded above and below by impenetrable walls, with a no-slip boundary condition imposed on the bottom wall. For $H^2$ initial velocity, we establish strong convergence in the $L^p$ norm to the limiting problem as the vertical viscosity approaches zero, for any $2\leq p <\infty$. The main challenge lies in the mismatch of boundary conditions - spec…

This https://arxiv.org/abs/2505.09708 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The uncertainty of magnetic fields in 3D non-local thermodynamic equilibrium inversions
We describe our approach to solve the problem of ensuring the solenoidality of the magnetic field vector in three-dimensional (3D) inversions, as well as the estimation of the uncertainty in the inferred magnetic field. The solenoidality of the magnetic field vector is often disregarded in the inversion of spectropolarimetric data due to limitations in the traditional one-dimensional inversion techniques. We propose a method to ensure the solenoidal condition in 3D inversions based on our meshf…