Applicability of approximations used in calculations of the spectrum of dark matter particles produced in particle decays

Fedor Bezrukov, Dmitry Gorbunov

    Research output: Contribution to journalArticlepeer-review

    Abstract

    For the warm dark matter (WDM) candidates the momentum distribution of particles becomes important, since it can be probed with observations of Lyman-α forest structures and confronted with coarse grained phase space density in galaxy clusters. We recall the calculation [M. Kaplinghat, Phys. Rev. D 72, 063510 (2005)] of the spectrum in the case of dark matter nonthermal production in decays of heavy particles emphasizing the inherent applicability conditions, which are rather restrictive and sometimes ignored in literature. The cold part of the spectrum requires special care when WDM is considered.

    Original languageEnglish
    Article number063502
    JournalPhysical Review D
    Volume93
    Issue number6
    DOIs
    Publication statusPublished - 3 Mar 2016

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