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Cosmic Microwave Background constraint on residual annihilations of relic particles | | Patrick McDonald
; Robert J. Scherrer
; Terry P. Walker
; | | Date: |
9 Aug 2000 | | Journal: | Phys.Rev. D63 (2001) 023001 | | Subject: | astro-ph hep-ph | | Abstract: | Energy injected into the Cosmic Microwave Background at redshifts z<10^6 will distort its spectrum permanently. In this paper we discuss the distortion caused by annihilations of relic particles. We use the observational bounds on deviations from a Planck spectrum to constrain a combination of annihilation cross section, mass, and abundance. For particles with (s-wave) annihilation cross section, =sigma_0, the bound is f[(sigma_0/6e-27cm^3/s)(Omega_{Xar{X}}h^2)^2]/(m_X/MeV)<0.2, where m_X is the particle mass, Omega_{Xar{X}} is the fraction of the critical density the particle and its antiparticle contribute if they survive to the present time, h=H_0/(100km/s/Mpc), H_0 is the Hubble constant, and f is the fraction of the annihilation energy that interacts electromagnetically. We also compute the less stringent limits for p-wave annihilation. We update other bounds on residual annihilations and compare them to our CMB bound. | | Source: | arXiv, astro-ph/0008134 | | Services: | Forum | Review | PDF | Favorites | |
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