Tootfinder

Dark matter spikes with strongly self-interacting particles
Boris Betancourt Kamenetskaia, Motoko Fujiwara, Alejandro Ibarra, Takashi Toma
https://arxiv.org/abs/2506.12642

Dark matter spikes with strongly self-interacting particles
An unavoidable prediction of scenarios with Dark Matter (DM) self-interactions is the existence of number changing processes that convert $n$ initial DM particles into $m$ final ones ($n\to m$ processes), possibly accompanied by Standard Model particles. We argue that the $n\rightarrow m$ processes could be probed in DM spikes at the center of galaxies, where the high density may allow sizable rates. We systematically study the implications of the $n \to m$ processes in DM spikes, including oth…

Numerical evolution of self-gravitating halos of self-interacting dark matter
Marc Kamionkowski, Kris Sigurdson, Oren Slone
https://arxiv.org/abs/2506.04334

Numerical evolution of self-gravitating halos of self-interacting dark matter
We discuss a modification of a recently developed numerical scheme for evolving spherically symmetric self-gravitating systems to include the effects of self-interacting dark matter. The approach is far more efficient than traditional N-body simulations and cross sections with different dependencies on velocity and scattering-angle are easily accommodated. To demonstrate, we provide results of a simulation, which runs quickly on a personal computer, that shows the expected initial flattening of…

Collapse Scenario and Final State of Evaporation for Schwarzschild Black Hole in Dimensionally-Reduced Model of Dilaton Gravity
Voja Radovanovi\'c, Stefan {\DJ}or{\dj}evi\'c
https://arxiv.org/abs/2506.09946

Collapse Scenario and Final State of Evaporation for Schwarzschild Black Hole in Dimensionally-Reduced Model of Dilaton Gravity
We study a model of (1+1)-dimensional dilaton gravity derived from the four-dimensional Einstein-Hilbert action by dimensional reduction in a semiclassical approximation including back-reaction. The reduced action involves the cosmological constant and admits black hole solutions; among these, the solutions of interest are the evaporating black holes. We solve the equations of motion perturbatively by demanding that the initial state geometry is a Minkowski space-time. When the infalling matter…

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 …

Semiclassical evolution of a dynamically formed spherical black hole with an inner horizon
Valentin Boyanov, David Hilditch, Artur Semi\~ao
https://arxiv.org/abs/2506.04845

Semiclassical evolution of a dynamically formed spherical black hole with an inner horizon
In this work we obtain a numerical self-consistent spherical solution of the semiclassical Einstein equations representing the evaporation of a trapped region which initially has both an outer and an inner horizon. The classical matter source used is a static electromagnetic field, allowing for an approximately Reissner-Nordström black hole as the initial configuration, where the charge sets the initial scale of the inner horizon. The semiclassical contribution is that of a quantum scalar fiel…

This https://arxiv.org/abs/2408.03056 has been replaced.
initial toot: https://mastoxiv.page/@a…

Self-consistent theory of $2\times2$ pair density waves in kagome superconductors
Pair density wave (PDW) is an intriguing quantum matter proposed in the frontier of condensed matter physics. However, the existence of PDW in microscopic models has been rare. In this work, we obtain, by Ginzburg-Landau arguments and self-consistent mean field theory, novel $2a_0\times2a_0$ PDW on the kagome lattice arising from attractive on-bond pairing interactions and the distinct Bloch wave functions near the p-type van Hove singularity. The PDW state carrying three independent wave-vecto…

This https://arxiv.org/abs/2502.17570 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Effects of spacetime geometry on neutrino oscillation inside a Core-Collapse Supernova
Neutrinos are excellent probes of the inner structures of supernovas. However, an understanding of their dynamics remains incomplete, which is crucial for properly interpreting the detector data. The huge matter density inside a core collapse supernova affects the self-coupling of the neutrinos through a geometrical four-fermion interaction induced by spacetime torsion generated by the fermions themselves. For normal mass hierarchy, the effect is negligible; for inverted mass hierarchy however,…

Gravothermal expansion of dwarf spheroidal galaxies heated by dark subhaloes
Jorge Pe\~narrubia, Rapha\"el Errani, Eduardo Vitral, Matthew G. Walker
https://arxiv.org/abs/2506.03904

Gravothermal expansion of dwarf spheroidal galaxies heated by dark subhaloes
We use analytical and $N$-body methods to study the evolution of dwarf spheroidal galaxies (dSphs) embedded in dark matter (DM) haloes that host a sizeable subhalo population. Dark subhaloes generate a fluctuating gravitational field that injects energy into stellar orbits, driving a gradual expansion of dSphs. Despite the overall expansion, the stellar density profile preserves its initial shape, suggesting that the evolution proceeds in a self-similar manner. Meanwhile, the velocity dispersio…

This https://arxiv.org/abs/2403.14762 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Flavor composition of supernova neutrinos
Predicting the flavor composition of neutrinos from supernovae is a challenging task, primarily due to the high neutrino densities at their core. In such an environment, neutrino self-interactions give rise to collective effects that have dramatic yet poorly understood consequences for their flavor evolution. In this paper, however, we show that standard matter effects in the outer layers of supernovae can significantly constrain the flavor composition of the neutrino flux. We assume that, sinc…

This https://arxiv.org/abs/2408.01487 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

EDEN: Exploring Disks Embedded in N-body simulations of Milky-Way-mass halos from Symphony
We investigate the impact of galactic disks on the tidal stripping of cold dark matter subhalos within Milky Way (MW)-mass halos ($M_{\rm vir}\sim 10^{12}\mathrm{M_{\odot}}$) using a new simulation suite, EDEN. By re-simulating 45 MW-mass zoom-in halos from the N-body Symphony compilation with embedded disk potentials, which evolve according to star formation histories predicted by the UniverseMachine model, we self-consistently tie disk growth to halo accretion rate and significantly expand th…