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Title: Signatures of self-interacting dark matter on cluster density profile and subhalo distributions

Abstract

Non-gravitational interactions between dark matter particles with strong scattering, but relatively small annihilation and dissipation, has been proposed to match various observables on cluster and group scales. In this paper, we present the results from large cosmological simulations which include the effects of different self-interaction scenarios. In particular we explore a model with the differential cross section that can depend on both the relative velocity of the interacting particles and the angle of scattering. We focus on how quantities, such as the stacked density profiles, subhalo counts and the splashback radius change as a function of different forms of self-interaction. We find that self-interactions not only affect the central region of the cluster, the effect well known from previous studies, but also significantly alter the distribution of subhalos and the density of particles out to the splashback radius. Therefore, our results suggest that current weak lensing data can already put constraints on the self-interaction cross-section that are only slightly weaker than the Bullet Cluster constraints (σ/m ≲ 2 cm2/g), and future lensing surveys should be able to tighten them even further making halo profiles on cluster scales a competitive probe for DM physics.

Authors:
 [1];  [1];  [2];  [3];  [4]
  1. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  3. Univ. of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI); Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune (India)
  4. Univ. of Chicago, IL (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); Kavli Institute for Cosmological Physics, University of Chicago
OSTI Identifier:
1633956
Grant/Contract Number:  
AC02-76SF00515; AST-171465; PHY-1125897
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2020; Journal Issue: 02; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Cosmological simulations; dark matter simulations; galaxy clusters; weak gravitational lensing

Citation Formats

Banerjee, Arka, Adhikari, Susmita, Dalal, Neal, More, Surhud, and Kravtsov, Andrey. Signatures of self-interacting dark matter on cluster density profile and subhalo distributions. United States: N. p., 2020. Web. doi:10.1088/1475-7516/2020/02/024.
Banerjee, Arka, Adhikari, Susmita, Dalal, Neal, More, Surhud, & Kravtsov, Andrey. Signatures of self-interacting dark matter on cluster density profile and subhalo distributions. United States. doi:https://doi.org/10.1088/1475-7516/2020/02/024
Banerjee, Arka, Adhikari, Susmita, Dalal, Neal, More, Surhud, and Kravtsov, Andrey. Wed . "Signatures of self-interacting dark matter on cluster density profile and subhalo distributions". United States. doi:https://doi.org/10.1088/1475-7516/2020/02/024. https://www.osti.gov/servlets/purl/1633956.
@article{osti_1633956,
title = {Signatures of self-interacting dark matter on cluster density profile and subhalo distributions},
author = {Banerjee, Arka and Adhikari, Susmita and Dalal, Neal and More, Surhud and Kravtsov, Andrey},
abstractNote = {Non-gravitational interactions between dark matter particles with strong scattering, but relatively small annihilation and dissipation, has been proposed to match various observables on cluster and group scales. In this paper, we present the results from large cosmological simulations which include the effects of different self-interaction scenarios. In particular we explore a model with the differential cross section that can depend on both the relative velocity of the interacting particles and the angle of scattering. We focus on how quantities, such as the stacked density profiles, subhalo counts and the splashback radius change as a function of different forms of self-interaction. We find that self-interactions not only affect the central region of the cluster, the effect well known from previous studies, but also significantly alter the distribution of subhalos and the density of particles out to the splashback radius. Therefore, our results suggest that current weak lensing data can already put constraints on the self-interaction cross-section that are only slightly weaker than the Bullet Cluster constraints (σ/m ≲ 2 cm2/g), and future lensing surveys should be able to tighten them even further making halo profiles on cluster scales a competitive probe for DM physics.},
doi = {10.1088/1475-7516/2020/02/024},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 02,
volume = 2020,
place = {United States},
year = {2020},
month = {2}
}

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