Disentangling the Potential Dark Matter Origin of LIGO’s Black Holes

Magee, R. M.; Hanna, C.

doi:10.3847/2041-8213/aa831c

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…A smaller boost extends over a wide range of masses O(0.1M ⊙ ) up to O(100M ⊙ ), with LIGO precursors (M ∼ 10M ⊙ ) boosted by a factor of about 5. If the fractional mass density in the range 10 < M/M ⊙ < 50 is tuned consistent with the merger rate inferred from the LIGO observations, f ≃ 0.001 [13,14,113] (see also [57] which does not assume a monochromatic PBH mass spectrum, and [114] who reached a different conclusion about the required mass fraction), a much larger density in solar mass black holes is found; PBHs make up 13% of DM in the mass range 0.2 < M/M ⊙ < 1. This fraction can be adjusted by small changes in the tilt of the density power spectrum.…”

Section: Discussionsupporting

confidence: 60%

Primordial black holes with an accurate QCD equation of state

Byrnes

Hindmarsh

Young

et al. 2018

J. Cosmol. Astropart. Phys.

197

173

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Making use of definitive new lattice computations of the Standard Model thermodynamics during the quantum chromodynamic (QCD) phase transition, we calculate the enhancement in the mass distribution of primordial black holes (PBHs) due to the softening of the equation of state. We find that the enhancement peaks at approximately 0.7M⊙, with the formation rate increasing by at least two orders of magnitude due to the softening of the equation of state at this time, with a range of approximately 0.3M⊙ < M < 1.4M⊙ at full width half-maximum. PBH formation is increased by a smaller amount for PBHs with masses spanning a large range, 10 −3 M⊙ < MPBH < 10 3 M⊙, which includes the masses of the BHs that LIGO detected. The most significant source of uncertainty in the number of PBHs formed is now due to unknowns in the formation process, rather than from the phase transition. A near scale-invariant density power spectrum tuned to generate a population with mass and merger rate consistent with that detected by LIGO should also produce a much larger energy density of PBHs with solar mass. The existence of BHs below the Chandresekhar mass limit would be a smoking gun for a primordial origin and they could arguably constitute a significant fraction of the cold dark matter density. They also pose a challenge to inflationary model building which seek to produce the LIGO BHs without overproducing lighter PBHs. * C.Byrnes@sussex.ac.uk † m.b.hindmarsh@sussex.ac.uk ‡ S.M.Young@sussex.ac.uk

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Section: Discussionsupporting

confidence: 60%

Primordial black holes with an accurate QCD equation of state

Byrnes

Hindmarsh

Young

et al. 2018

J. Cosmol. Astropart. Phys.

197

173

View full text Add to dashboard Cite

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“…[40] that wider mass functions usually develop an extended low mass tail when compared to the lognormal form. Another common choice is the power law mass function [15,[46][47][48] which we do not consider in this paper.…”

Section: Review Of Pbh Binary Formationmentioning

confidence: 99%

Gravitational waves from primordial black hole mergers

Raidal

Vaskonen

Veermäe

2017

J. Cosmol. Astropart. Phys.

333

375

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We study the production of primordial black hole (PBH) binaries and the resulting merger rate, accounting for an extended PBH mass function and the possibility of a clustered spatial distribution. Under the hypothesis that the gravitational wave events observed by LIGO were caused by PBH mergers, we show that it is possible to satisfy all present constraints on the PBH abundance, and find the viable parameter range for the lognormal PBH mass function. The non-observation of a gravitational wave background allows us to derive constraints on the fraction of dark matter in PBHs, which are stronger than any other current constraint in the PBH mass range 0.5 − 16M . We show that the predicted gravitational wave background can be observed by the coming runs of LIGO, and its non-observation would indicate that the observed events are not of primordial origin. As the PBH mergers convert matter into radiation, they may have interesting cosmological implications, for example in the context of relieving the tension between high and low redshift measurements of the Hubble constant. However, we find that these effects are suppressed as, after recombination, no more that 1% of dark matter can be converted into gravitational waves.

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“…LISA will be able to determine the eccentricity for mergers with e 10 −6 (Seto 2016). Detection of BHs with masses less than ∼ 1 M , which may be possible with the advanced LIGO, VIRGO, and KAGRA at design sensitivity, would provide strong evidence of the existence of PBHs (Magee & Hanna 2017;. Finally, future GW detectors will allow us to map out the cosmological luminosity distance (or redshift) distribution for BH mergers to high redshifts (Nakamura et al 2016;Koushiappas & Loeb 2017b).…”

Section: Hidden Universality In the Merger Rate Densitymentioning

confidence: 99%

Hidden Universality in the Merger Rate Distribution in the Primordial Black Hole Scenario

Kocsis

Suyama

Tanaka

et al. 2018

ApJ

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It has been proposed that primordial black holes (PBHs) form binaries in the radiation dominated era. Once formed, some fraction of them may merge within the age of the Universe by gravitational radiation reaction. We investigate the merger rate of the PBH binaries when the PBHs have a distribution of masses around O(10)M , which is a generalization of the previous studies where the PBHs are assumed to have the same mass. After deriving a formula for the merger time probability distribution in the PBH mass plane, we evaluate it under two different approximations. We identify a quantity constructed from the mass-distribution of the merger rate density per unit cosmic time and comoving volume R(m 1 , m 2 ), α = −(m 1 + m 2 ) 2 ∂ 2 ln R/∂m 1 ∂m 2 , which universally satisfies 0.97 α 1.05 for all binary masses independently of the PBH mass function. This result suggests that the measurement of this quantity is useful for testing the PBH scenario.

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Disentangling the Potential Dark Matter Origin of LIGO’s Black Holes

Cited by 6 publications

References 49 publications

Primordial black holes with an accurate QCD equation of state

Primordial black holes with an accurate QCD equation of state

Gravitational waves from primordial black hole mergers

Hidden Universality in the Merger Rate Distribution in the Primordial Black Hole Scenario

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