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• W2172214882 abstract "We use cosmic microwave background data from the WMAP, SPT, BICEP, and QUaD experiments to obtain constraints on the dark matter particle mass ${m}_{ensuremath{chi}}$, and show that the combined data requires ${m}_{ensuremath{chi}}>7.6text{ }text{ }mathrm{GeV}$ at the 95% confidence level for the $ensuremath{chi}ensuremath{chi}ensuremath{rightarrow}boverline{b}$ channel assuming $s$-wave annihilation and a thermal cross section $⟨{ensuremath{sigma}}_{mathrm{a}}v⟩=3ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}26}text{ }text{ }{mathrm{cm}}^{3}/mathrm{s}$. We examine whether the bound on ${m}_{ensuremath{chi}}$ is sensitive to ${ensuremath{sigma}}_{8}$ measurements made by galaxy cluster observations. The large uncertainty in ${ensuremath{sigma}}_{8}$ and the degeneracy with ${ensuremath{Omega}}_{mathrm{m}}$ allow only small improvements in the dark matter mass bound. Increasing the number of effective neutrinolike degrees of freedom to ${N}_{mathrm{eff}}=3.85$ improves the mass bound to ${m}_{ensuremath{chi}}>8.6text{ }text{ }mathrm{GeV}$ at 95% confidence, for the $ensuremath{chi}ensuremath{chi}ensuremath{rightarrow}boverline{b}$ channel. We also study models in which dark matter halos at $z<60$ reionize the Universe. We compute the Ostriker-Vishniac power resulting from partial reionization at intermediate redshifts $10<z<60$, but find the effect to be small. We discuss the importance of the large angle polarization as a complementary probe of dark matter annihilation. By performing Monte Carlo simulations, we show that future experiments that measure the $EE$ power spectrum from $20<l<50$ can exclude ${m}_{ensuremath{chi}}ensuremath{sim}10text{ }text{ }mathrm{GeV}$ at the $2(3)ensuremath{sigma}$ level provided the error bars are smaller than $4(3)ifmmodetimeselsetexttimesfi{}mathrm{text{cosmic variance}}$. We show that the Planck experiment will significantly improve our knowledge of dark matter properties." @default.
• W2172214882 created "2016-06-24" @default.
• W2172214882 creator A5028438229 @default.
• W2172214882 date "2012-04-19" @default.
• W2172214882 modified "2023-09-23" @default.
• W2172214882 title "Closer look at CMB constraints on WIMP dark matter" @default.
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• W2172214882 doi "https://doi.org/10.1103/physrevd.85.083517" @default.
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