Visualizing invisible dark matter annihilation with the CMB and matter power spectrum

Cui, Yanou; Huo, Ran

doi:10.1103/physrevd.100.023004

Title: Visualizing invisible dark matter annihilation with the CMB and matter power spectrum

Journal Article · Fri Jul 12 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/physrevd.100.023004· OSTI ID:1611073

Cui, Yanou ^[1];

^[1]

Univ. of California, Riverside, CA (United States)

We study the cosmological signatures of invisibly annihilating dark matter (IAnDM), where DM annihilates into dark radiation particles that are decoupled from the Standard Model (SM). In the simple benchmark model we consider here, such invisible annihilation determines the relic abundance of DM via dark thermal freeze-out. We demonstrate that IAnDM may reveal itself through observable, novel signatures that are correlated: scale-dependent ΔN_eff (number of extra effective neutrinos) in the cosmic microwave background (CMB) spectrum due to DM residual annihilation, while the phase of acoustic peaks shifts towards the opposite direction relative to that due to SM neutrinos, resembling the effect due to scattering (fluidlike) thermal dark radiation; in addition, IAnDM induces modifications to the matter power spectrum that resemble those due to warm dark matter. Current data are sensitive to IAnDM with masses up to ~200 keV, while future observations will improve this reach, especially if the late-time DM annihilation cross section is enhanced relative to the standard thermal value, which can be realized in a variety of scenarios. Furthermore, this work also demonstrates a new possibility of realizing thermal sub-MeV DM with observable signals.

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Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008541

OSTI ID:: 1611073

Alternate ID(s):: OSTI ID: 1546374

Journal Information:: Physical Review D, Vol. 100, Issue 2; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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