X-ray lines and self-interacting dark matter.
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We study the correlation between a monochromatic signal from annihilating dark matter and its self-interacting cross section.We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model.We also propose a way to distinguish such models by future direct detection techniques.
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Affiliation: Laboratoire de Physique Théorique, Université de Paris-Sud 11, CNRS-UMR 8627, 91405 Orsay Cedex, France.
ABSTRACT
We study the correlation between a monochromatic signal from annihilating dark matter and its self-interacting cross section. We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model. We combine the recent observation of the cluster Abell 3827 for self-interacting dark matter and the constraints on the annihilation cross section for monochromatic X-ray lines. We also confront our model to a set of recent experimental analyses and find that such an extension can naturally produce a monochromatic keV signal corresponding to recent observations of Perseus or Andromeda, while in the meantime it predicts a self-interacting cross section of the order of [Formula: see text], as recently claimed in the observation of the cluster Abell 3827. We also propose a way to distinguish such models by future direct detection techniques. No MeSH data available. Related in: MedlinePlus |
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Mentions: In our model, we have four diagrams contributing to the self-interacting cross section as depicted in Fig. 1. Once the scalar part of develops a VEV it becomes possible to re-express the total cross section as3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} \frac{\sigma _{aa}}{m_a}= & {} \frac{\lambda ^2 m_a}{32 \pi m_s^4 \left( 1-4 \frac{m_a^2}{m_s^2}\right) ^2} \nonumber \\\simeq & {} \frac{\lambda ^2 m_a}{32 \pi m_s^4},\quad (m_s \gg m_a). \end{aligned}$$\end{document}σaama=λ2ma32πms41-4ma2ms22≃λ2ma32πms4,(ms≫ma).It is interesting to note that the cross section is of the form and then for , whereas if one takes into account only the quartic vertex aaaa, it should naively be proportional to and could potentially diverge. The mechanism canceling the divergences is in fact similar to the Higgs contribution occurring in the WW scattering in the Standard Model. This can easily be understood as can be considered as the pseudo-Goldstone boson generated by the breaking of the global U(1) symmetry. This fundamental feature would not have been observed in the framework of an effective approach if one introduces a dimensional coupling of the form , being a free mass parameter. It is thus the dynamical structure of the construction which defines precisely its self-coupling constants. Another interesting point is that, for a MeV scale mediator s, one does not need to invoke very large values of to obtain a self-interacting cross section compatible with recent analysis. For instance, in the case of keV and MeV, one obtains , which is of the order of the measured limit () for a reasonable value of , much below the perturbativity limit, without invoking velocity enhancement. |
View Article: PubMed Central - PubMed
Affiliation: Laboratoire de Physique Théorique, Université de Paris-Sud 11, CNRS-UMR 8627, 91405 Orsay Cedex, France.
We study the correlation between a monochromatic signal from annihilating dark matter and its self-interacting cross section. We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model. We combine the recent observation of the cluster Abell 3827 for self-interacting dark matter and the constraints on the annihilation cross section for monochromatic X-ray lines. We also confront our model to a set of recent experimental analyses and find that such an extension can naturally produce a monochromatic keV signal corresponding to recent observations of Perseus or Andromeda, while in the meantime it predicts a self-interacting cross section of the order of [Formula: see text], as recently claimed in the observation of the cluster Abell 3827. We also propose a way to distinguish such models by future direct detection techniques.
No MeSH data available.