CMB bounds on dark matter annihilation: Nucleon energy losses after recombination
2013 (English)In: Physical Review D, ISSN 1550-7998, Vol. 87, no 12, 123008- p.Article in journal (Refereed) Published
We consider the propagation and energy losses of protons and antiprotons produced by dark matter annihilation at redshifts 100 < z less than or similar to 2000. In the case of dark matter annihilations into quarks, gluons and weak gauge bosons, protons and antiprotons carry about 20% of the energy injected into e(+/-) and gamma's, but their interactions are normally neglected when deriving cosmic microwave background bounds from altered recombination histories. Here, we follow numerically the energy-loss history of typical protons/antiprotons in the cosmological medium. We show that about half of their energy is channeled into photons and e(+/-), and we present a simple prescription to estimate the corresponding strengthening of the cosmic microwave background bounds on the dark matter annihilation cross section.
Place, publisher, year, edition, pages
2013. Vol. 87, no 12, 123008- p.
IdentifiersURN: urn:nbn:se:su:diva-92651DOI: 10.1103/PhysRevD.87.123008ISI: 000320951900005OAI: oai:DiVA.org:su-92651DiVA: diva2:641296