arXiv : Asymmetric dark matter: residual annihilations and self-interactions

Baldes, Iason; Panci, Paolo; Petraki, Kalliopi; Sala, Filippo; Cirelli, Marco; Taoso, Marco

doi:10.21468/SciPostPhys.4.6.041

Article
Report number	arXiv:1712.07489 ; CERN-TH-2017-272 ; DESY-17-232 ; NIKHEF-2017-070
Title	Asymmetric dark matter: residual annihilations and self-interactions
Related title	Asymmetric dark matter: residual annihilations and self-interactions
Author(s)	Baldes, Iason (DESY) ; Cirelli, Marco (Paris, LPTHE) ; Panci, Paolo (CERN) ; Petraki, Kalliopi (Paris, LPTHE ; NIKHEF, Amsterdam) ; Sala, Filippo (DESY) ; Taoso, Marco (Madrid, IFT ; INFN, Turin)
Publication	2018-06-26
Imprint	2017-12-20
Number of pages	9
Note	20 pages, 4 figures
In:	SciPost Phys. 4 (2018) 041
DOI	10.21468/SciPostPhys.4.6.041
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	Dark matter (DM) coupled to light mediators has been invoked to resolve the putative discrepancies between collisionless cold DM and galactic structure observations. However, $\gamma$-ray searches and the CMB strongly constrain such scenarios. To ease the tension, we consider asymmetric DM. We show that, contrary to the common lore, detectable annihilations occur even for large asymmetries, and derive bounds from the CMB, $\gamma$-ray, neutrino and antiproton searches. We then identify the viable space for self-interacting DM. Direct detection does not exclude this scenario, but provides a way to test it.
Copyright/License	arXiv nonexclusive-distrib. 1.0

$Constrained regions (shaded areas in blue, pink, purple and cyan) in the parameter space of the DM mass $M_{p_{\mathsmaller{D}}}$ and mediator mass $M_V$, together with areas of sizable self-interactions (shaded green), for the symmetric DM case, i.e.~$r_{\infty}=1$, and including the effect of the dark electrons. The areas of sizable self-interactions are ruled out by the CMB and {\sc Fermi} dSphs constraints. This panel is to be contrasted to the asymmetric cases, $r_{\infty} < 1$, illustrated in Fig.~\ref{fig:constraints2}. The yellow contours show the direct detection constraints for the indicated values of $\epsilon$. The blue dashed line shows the location of the first parametric resonance due to the Sommerfeld effect. Formation of $\bar{p}_{\mathsmaller{D}}p_{\mathsmaller{D}}$ bound states is possible to the right of the blue solid line. Formation of $p_{\mathsmaller{D}}e_{\mathsmaller{D}}$ bound states is possible to the right of the red dashed lines for, from left to right, $m_{e_{\mathsmaller{D}}}=M_{p_{\mathsmaller{D}}}/10,100,1000$. The kinematically inaccessible part of the parameter space on the top left corner, shaded here for $M_V > M_{p_{\mathsmaller{D}}}$, extends to encompass the region $M_V > m_{e_{\mathsmaller{D}}}$ in the presence of dark electrons.$ $Dark matter annihilation processes. Due to the light mediator the annihilations are Sommerfeld enhanced. Unstable $p_{\mathsmaller{D}}-\bar{p}_{\mathsmaller{D}}$ bound states can also form radiatively and decay into mediators, thus depleting the DM density.$ $Diagramatic summary of the $\bar{p}_{\mathsmaller{D}}p_{\mathsmaller{D}}$ DM bound state decays, analogous to those of true muonium~\cite{Brodsky:2009gx}. Bound state formation becomes important at relatively large values of $\aD$ and $\MDM$ and when the temperature drops far enough for the inverse ionization process to become slower than the relevant decay rates.$ Show more plots

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記錄創建於2017-12-23，最後更新在2023-12-20

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