Inflationary primordial black holes as all dark matter

Inomata, Keisuke; Kawasaki, Masahiro; Mukaida, Kyohei; Tada, Yuichiro; Yanagida, Tsutomu T.

doi:10.1103/physrevd.96.043504

Cited by 215 publications

(203 citation statements)

References 78 publications

(151 reference statements)

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“…To obtain the PBH abundance, we follow the treatment of [36] (and references therein) that models the collapse of an overdense region with some simplifying assumptions. The procedure consists in first evaluating the variance [37] σ 2 (M PBH (k)) = 16 81…”

Section: Primordial Black Hole Productionmentioning

confidence: 99%

Constant roll and primordial black holes

Motohashi

Mukohyama

Oliosi

2020

J. Cosmol. Astropart. Phys.

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The constant-roll inflation with small positive value of the constant-roll parameter β ≡φ Hφ = const. has been known to produce a slightly red-tilted curvature power spectrum compatible with the current observational constraints. In this work, we shed light on the constant-roll inflation with negative β and investigate how a stage of constant-roll inflation may realize the growth in the primordial curvature power spectrum necessary to produce a peaked spectrum of primordial black hole abundance. We first review the behavior of constant-roll models in the range of parameters − 3 2 < β < 0, which allows for a constant-roll attractor stage generating a blue-tilted curvature power spectrum without superhorizon growth. As a concrete realization, we consider a potential with two slow-roll stages, separated by the constant-roll stage, in a way that satisfies the current constraints on the power spectrum and the primordial black hole abundance. The model can produce primordial black holes as all dark matter, LIGO-Virgo events, or OGLE microlensing events. Due to the range of different scalar tilts allowed by the constant-roll potential, this construction is particularly robust and testable by future observations.

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Section: Primordial Black Hole Productionmentioning

confidence: 99%

Constant roll and primordial black holes

Motohashi

Mukohyama

Oliosi

2020

J. Cosmol. Astropart. Phys.

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“…[9,17,19] the sharp peak is realized mainly by the cancellation of the Hubble-induced mass during the oscillation phase due to the kinetic coupling, while it is simply a red-tilted one due to the inflaton's mass in this paper such as Refs. [18,63,64]. If one adopts the Press-Schechter approach with the Gaussian window which is relatively inefficient, the required primordial perturbations become large and the peak of the power spectrum should be highly sharp with use of such a complicated mechanism in order to avoid the current pulsar timing array (PTA) constraints on the stochastic GWs.…”

Section: Plmentioning

confidence: 99%

Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes

2019

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We investigate a possibility of primordial black hole (PBH) formation with a hierarchical mass spectrum in multiple phases of inflation. As an example, we find that one can simultaneously realize a mass spectrum which has recently attracted a lot of attention: stellar-mass PBHs (∼ O(10)M ) as a possible source of binary black holes detected by LIGO/Virgo collaboration, asteroid-mass (∼ O(10 −12 )M ) as a main component of dark matter, and earth-mass (∼ O(10 −5 )M ) as a source of ultrashort-timescale events in Optical Gravitational Lensing Experiment microlensing data. The recent refined de Sitter swampland conjecture may support such a multi-phase inflationary scenario with hierarchical mass PBHs as a transition signal of each inflationary phase.

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“…Such a peak in the curvature perturbation is possible in some inflation models, which has attracted much attention recently [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. It is also well known that the large scalar perturbation can induce large tensor perturbations since they are coupled at the nonlinear order.…”

Section: Introductionmentioning

confidence: 99%

Pulsar timing array constraints on the induced gravitational waves

Cai

Wang

et al. 2019

J. Cosmol. Astropart. Phys.

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If the black holes detected by LIGO/VIRGO are primordial black holes (PBHs) sourcing from a large primordial curvature perturbation at small scales, the corresponding induced gravitational waves (GWs) would peak at nanohertz that is detectable by the current and future observations of pulsar timing array (PTA). In this paper we show that with the mass function estimated from the merger rate of LIGO O1 and O2 events, the induced GWs from such a curvature perturbation with a Gaussian narrow peak at some small scale would be in a seemingly mild tension with current constraints from PTA. However, if the curvature perturbation is of local-type non-Gaussianity with a non-linear parameter f NL O(10), the tension could be relieved. Nevertheless, such an induced GWs must be detectable by the Square Kilometer Array in a decade or less.

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Inflationary primordial black holes as all dark matter

Cited by 215 publications

References 78 publications

Constant roll and primordial black holes

Constant roll and primordial black holes

Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes

Pulsar timing array constraints on the induced gravitational waves

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