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Type: Journal article
Title: The distribution of inelastic dark matter in the Sun
Author: Blennow, M.
Clementz, S.
Herrero-Garcia, J.
Citation: European Physical Journal C, 2018; 78(5):386-1-386-16
Publisher: Springer-Verlag
Issue Date: 2018
ISSN: 1434-6044
Statement of
Mattias Blennow, Stefan Clementz, Juan Herrero-Garcia
Abstract: If dark matter is composed of new particles, these may become captured after scattering with nuclei in the Sun, thermalize through additional scattering, and finally annihilate into neutrinos that can be detected on Earth. If dark matter scatters inelastically into a slightly heavier (O(10−100)keV) state it is unclear whether thermalization occurs. One issue is that up-scattering from the lower mass state may be kinematically forbidden, at which point the thermalization process effectively stops. A larger evaporation rate is also expected due to down-scattering. In this work, we perform a numerical simulation of the capture and thermalization process in order to study the evolution of the dark matter distribution. We then calculate and compare the annihilation rate with that of the often assumed Maxwell–Boltzmann distribution. We also check if equilibrium between capture and annihilation is reached. We find that, unless the mass splitting is very small (≲50 keV) and/or the dark matter has a sub-dominant elastic cross section, the dark matter distribution does not reach a stationary state, it is not isothermal, annihilation is severely suppressed, and equilibrium is generally not reached. We also find that evaporation induced by down-scattering is not effective in reducing the total dark matter abundance.
Description: Published online: 18 May 2018
Rights: © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecomm, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP³.
RMID: 0030090205
DOI: 10.1140/epjc/s10052-018-5863-4
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Appears in Collections:Physics publications

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