Zobrazeno 1 - 10
of 210
pro vyhledávání: '"Garny, Mathias"'
We investigate the formation of bound states of non-relativistic dark matter particles subject to long-range interactions through radiative capture. The initial scattering and final bound states are described by Coulomb potentials with different stre
Externí odkaz:
http://arxiv.org/abs/2411.08737
Dark matter (DM) self-interactions alter the matter distribution on galactic scales and alleviate tensions with observations. A feature of the self-interaction cross section is its angular dependence, influencing offsets between galaxies and DM halos
Externí odkaz:
http://arxiv.org/abs/2410.07175
We propose a simple model that can alleviate the $H_0$ tension while remaining consistent with big bang nucleosynthesis (BBN). It is based on a dark sector described by a standard Lagrangian featuring a $SU(N)$ gauge symmetry with $N\geq3$ and a mass
Externí odkaz:
http://arxiv.org/abs/2404.07256
The invisible decay of cold dark matter into a slightly lighter dark sector particle on cosmological time-scales has been proposed as a solution to the $S_8$ tension. In this work we discuss the possible embedding of this scenario within a particle p
Externí odkaz:
http://arxiv.org/abs/2403.15543
We scrutinize the Sommerfeld enhancement in dark matter pair annihilation for $p$-wave and higher-$\ell$ partial waves. For the Yukawa potential these feature a super-resonant Breit-Wigner peak in their velocity-dependence close to Sommerfeld resonan
Externí odkaz:
http://arxiv.org/abs/2403.07108
Autor:
Mazoun, Asmaa, Bocquet, Sebastian, Garny, Mathias, Mohr, Joseph J., Rubira, Henrique, Vogt, Sophie M. L.
We forecast the sensitivity of ongoing and future galaxy cluster abundance measurements to detect deviations from the cold dark matter (CDM) paradigm. Concretely, we consider a class of dark sector models that feature an interaction between dark matt
Externí odkaz:
http://arxiv.org/abs/2312.17622
Autor:
Taule, Petter, Garny, Mathias
Publikováno v:
JCAP 11 (2023) 078
We present the matter power spectrum in redshift space including two-loop corrections. We follow a strictly perturbative approach incorporating all non-linearities entering both via the redshift-space mapping and within real space up to the required
Externí odkaz:
http://arxiv.org/abs/2308.07379
Autor:
Hartmeier, Michael, Garny, Mathias
We derive a minimal basis of kernels furnishing the perturbative expansion of the density contrast and velocity divergence in powers of the initial density field that is applicable to cosmological models with arbitrary expansion history, thereby rela
Externí odkaz:
http://arxiv.org/abs/2308.06096
We explore the impact of highly excited bound states on the evolution of number densities of new physics particles, specifically dark matter, in the early Universe. Focusing on dipole transitions within perturbative, unbroken gauge theories, we devel
Externí odkaz:
http://arxiv.org/abs/2308.01336
We present non-linear solutions of Vlasov Perturbation Theory (VPT), describing gravitational clustering of collisionless dark matter with dispersion and higher cumulants induced by orbit crossing. We show that VPT can be cast into a form that is for
Externí odkaz:
http://arxiv.org/abs/2210.08089