Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations

Niikura, Hiroko; Takada, Masahiro; Yasuda, Naoki; Lupton, Robert H.; Sumi, T.; More, Surhud; Kurita, Toshiki; Sugiyama, Sunao; More, Anupreeta; Oguri, Masamune; Chiba, Masashi

doi:10.1038/s41550-019-0723-1

Cited by 494 publications

(606 citation statements)

References 65 publications

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“…One possible explanation for LIGO/Virgo BBHs is the primordial black holes (PBHs) [8][9][10] formed through the gravitational collapse of the primordial density fluctuations [32,33], which may accompany the induced GWs [34][35][36][37]. On the other hand, PBHs can also be a candidate of cold dark matter (CDM), and the abundance of PBHs in CDM has been constrained by various experiments [34,36,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Merger history of primordial black-hole binaries

Wu¹

2020

Phys. Rev. D

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As a candidate of dark matter, primordial black holes (PBHs) have attracted more and more attentions as they could be possible progenitors of the heavy binary black holes (BBHs) observed by LIGO/Virgo. Accurately estimating the merger rate of PBH binaries will be crucial to reconstruct the mass distribution of PBHs. It was pointed out the merger history of PBHs may shift the merger rate distribution depending on the mass function of PBHs. In this paper, we use 10 BBH events from LIGO/Virgo O1 and O2 observing runs to constrain the merger rate distribution of PBHs by accounting the effect of merger history. It is found that the second merger process makes subdominant contribution to the total merger rate, and hence the merger history effect can be safely neglected.

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Section: Introductionmentioning

confidence: 99%

Merger history of primordial black-hole binaries

Wu¹

2020

Phys. Rev. D

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“…We must stress that although it is conceivable that either due to quantum-gravitational back reaction [37,38] 1: Constraints on the allowed N -MACHO DM fraction as a function of N . In the allowed range 10 16 < N < 10 32 , there are bounds from femtolensing of gamma-ray bursts with the FERMI telescope [40] and from the microlensing search of M31 stars based on HSC/Subaru data [41] (red contours; 95% C.L.). It is assumed that the N -MACHO mass is given by…”

Section: Constraints and Signaturesmentioning

confidence: 99%

“…(i) femtolensing of gamma-ray bursts with the FERMI telescope [40], posing constraints in the range 10 −17 M and 10 −14 M , and (ii) microlensing of M31 stars based on HSC/Subaru data [41], which limits the abundance of compact DM objects from ∼ 10 −14 M to ∼ 10 −5 M .…”

Section: Constraints and Signaturesmentioning

confidence: 99%

Compact dark matter objects via N dark sectors

2020

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We propose a novel class of compact dark matter objects in theories where the dark matter consists of multiple sectors. We call these objects N -MACHOs. In such theories neither the existence of dark matter species nor their extremely weak coupling to the observable sector represent additional hypotheses but instead are imposed by the solution to the Hierarchy Problem and unitarity. The crucial point is that particles from the same sector have non-trivial interactions but interact only gravitationally otherwise. As a consequence, the pressure that counteracts the gravitational collapse is reduced while the gravitational force remains the same. This results in collapsed structures much lighter and smaller as compared to the ordinary single-sector case. We apply this phenomenon to a dark matter theory that consists of N dilute copies of the Standard Model. The solutions do not rely on an exotic stabilization mechanism, but rather use the same well-understood properties as known stellar structures. This framework also gives rise to new microscopic superheavy structures, for example with mass 10 8 g and size 10 −13 cm. By confronting the resulting objects with observational constraints, we find that, due to a huge suppression factor entering the mass spectrum, these objects evade the strongest constrained region of the parameter space. Finally, we discuss possible formation scenarios of N -MACHOs. We argue that, due to the efficient dissipation of energy on small scales, high-density regions such as ultra-compact mini-halos could serve as formation sites of N -MACHOs. * Electronic address: emi@mpp.mpg.de 1 An example of the theory that obeys such a standard is that of the axion [1,2], which is motivated by the Peccei-Quinn solu-arXiv:1911.13281v1 [astro-ph.CO]

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“…The primordialorigin BBHs are appealing candidates of LIGO/Virgo BBHs if the abundance of stellar mass PBHs in DM is a few part in thousand [6][7][8]. There are various powerful observational constraints in literature [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], but a substantial window remains open for PBHs as all of DM in the approximate range [10 −16 , 10 −14 ]∪[10 −13 , 10 −12 ]M . See a recent summary in [8].…”

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confidence: 99%

Probing primordial–black-hole dark matter with scalar induced gravitational waves

2019

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The possibility that primordial black holes (PBHs) represent all of the dark matter (DM) in the Universe and explain the coalescences of binary black holes detected by LIGO/Virgo has attracted a lot of attention. PBHs are generated by the enhancement of scalar perturbations which inevitably produce the induced gravitational waves (GWs). We calculate the induced GWs up to the thirdorder correction which not only enhances the amplitude of induced GWs, but also extends the cutoff frequency from 2k * to 3k * . Such effects of the third-order correction lead to an around 10% increase of the signal-to-noise ratio (SNR) for both LISA and pulsar timing array (PTA) observations, and significantly widen the mass range of PBHs in the stellar mass window accompanying detectable induced GWs for PTA observations including IPTA, FAST and SKA. On the other hand, the null detections of the induced GWs by LISA and PTA experiments will exclude the possibility that all of the DM is comprised of PBHs and the GW events detected by LIGO/Virgo are generated by PBHs.

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Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations

Cited by 494 publications

References 65 publications

Merger history of primordial black-hole binaries

Merger history of primordial black-hole binaries

Compact dark matter objects via N dark sectors

Probing primordial–black-hole dark matter with scalar induced gravitational waves

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