Dark matter density spikes around primordial black holes

Eroshenko, Yurii N.

doi:10.1134/s1063773716060013

Cited by 78 publications

(135 citation statements)

References 51 publications

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“…In particular, their abundance is believed to be intrinsically related to a possible non-Gaussianity of the density perturbations [150,151]. Moreover, it has been argued that a potential detection of a PBH might rule out several WIMP models [152][153][154][155][156][157].…”

Section: Evaporation Of Primordial Black Holesmentioning

confidence: 99%

The synergy between CMB spectral distortions and anisotropies

Lucca

Schöneberg

Hooper

et al. 2020

J. Cosmol. Astropart. Phys.

159

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Spectral distortions and anisotropies of the CMB provide independent and complementary probes to study energy injection processes in the early universe. Here we discuss the synergy between these observables, and show the promising future of spectral distortion missions to constrain both exotic and non-exotic energy injections. We show that conventional probes such as Big Bang Nucleosynthesis and CMB anisotropies can benefit from and even be surpassed by future spectral distortion experiments. For this, we have implemented a unified framework within the Boltzmann code class to consistently treat the thermal evolution of photons and baryons. Furthermore, we give an extensive and pedagogical introduction into the topic of spectral distortions and energy injections throughout the thermal history of the universe, highlighting some of their unique features and potential as a novel probe for cosmology and particle physics.1 This quantity should not be confused with the actual photon temperature Tγ , which may have a more complicated evolution. The precise normalization of Tz is arbitrary, but T0 ≡ Tz(0) will be chosen close to the actual temperature today, Tγ(0) = (2.7255 ± 0.0005)K [65,66], in order to have Tγ Tz at least in the late universe.2 Note that with perturbations in the PPSD this is not true anymore as shown in [51].

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Section: Evaporation Of Primordial Black Holesmentioning

confidence: 99%

The synergy between CMB spectral distortions and anisotropies

Lucca

Schöneberg

Hooper

et al. 2020

J. Cosmol. Astropart. Phys.

159

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show abstract

“…In the above calculations the BH mass could be assumed to be constant in all equations, except for Eqs. (11) and (12) describing the flow onto the BH. In these equations, when differentiating with respect to time, one should take into account the fact thatṙ g = 0.…”

Section: Density and Velocity Distributionsmentioning

confidence: 99%

Black Hole in a Radiation-Dominated Universe

2018

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We study a black hole in an expanding Universe during the radiation-dominated stage. In the case when the black hole radius is much smaller than the cosmological horizon, we present a solution of the Einstein equations for the metric, the matter density and velocity distributions. At distances much smaller than the cosmological horizon the solution features quasi-stationary accretion, while at large distances the solution asymptotes the homogeneous radiation dominated FLRW. We discuss how our solution is related to the McVittie solution. The obtained results can be applied, in particular, for the formation of dark matter density spikes around primordial black holes, and for the evolution of dark matter clumps during the radiation-dominated stage.

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“…Here, following Ref. [54], we aim to derive the DM density profile from first principles. Furthermore, our goal is to derive reliable bounds on the parameter space of the mixed PBH-WIMP scenario, using as little assumptions as possible.…”

Section: Introductionmentioning

confidence: 99%

Novel constraints on mixed dark-matter scenarios of primordial black holes and WIMPs

Boucenna

Kühnel

Ohlsson

et al. 2018

J. Cosmol. Astropart. Phys.

148

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We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a density spike of the WIMPs that are gravitationally bound to the PBHs, which results in an enhanced annihilation rate and increased indirect detection prospects. We show that such scenarios provide strong constraints on the allowed fraction of PBHs that constitutes the dark matter, depending on the WIMP mass m χ and the velocity-averaged annihilation cross-section σv . For the standard scenario with m χ = 100 GeV and σv = 3 × 10 −26 cm 3 /s, we derive bounds that are stronger than all existing bounds for PBHs with masses 10 −12 M M BH 10 4 M , where M is the solar mass, and mostly so by several orders of magnitude.

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Dark matter density spikes around primordial black holes

Cited by 78 publications

References 51 publications

The synergy between CMB spectral distortions and anisotropies

The synergy between CMB spectral distortions and anisotropies

Black Hole in a Radiation-Dominated Universe

Novel constraints on mixed dark-matter scenarios of primordial black holes and WIMPs

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