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- W3100502404 endingPage "009" @default.
- W3100502404 startingPage "009" @default.
- W3100502404 abstract "Dark Matter annihilations after recombination and during the epoch of structure formation deposit energy in the primordial intergalactic medium, producing reionization and heating. We investigate the constraints that are imposed by the observed optical depth of the Universe and the measured temperature of the intergalactic gas. We find that the bounds are significant, and have the power to rule out large portions of the `DM mass/cross section' parameter space. The optical depth bound is generally stronger and does not depend significantly on the history of structure formation. The temperature bound can be competitive in some cases for small masses or the hadronic annihilation channels (and is affected somewhat by the details of structure formation). We find in particular that DM particles with a large annihilation cross section into leptons and a few TeV mass, such as those needed to explain the PAMELA and FERMI+HESS cosmic ray excesses in terms of Dark Matter, are ruled out as they produce too many free electrons. We also find that low mass particles (≲ 10 GeV) tend to heat too much the gas and are therefore disfavored." @default.
- W3100502404 created "2020-11-23" @default.
- W3100502404 creator A5039666085 @default.
- W3100502404 creator A5047587648 @default.
- W3100502404 creator A5049559639 @default.
- W3100502404 date "2009-10-12" @default.
- W3100502404 modified "2023-10-01" @default.
- W3100502404 title "Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas" @default.
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