GW200105 and GW200115 are compatible with a scenario of primordial black hole binary coalescences

Wang, Qianqian; Zhao, Zhichao

doi:10.1140/epjc/s10052-021-09981-1

Cited by 17 publications

(7 citation statements)

References 36 publications

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“…The precision in this field is increasingly becoming a possible discriminator between the plethora of models in modified gravity. In addition to precise observations of the final phases of the coalescence of binary BHs [19], neutron stars [20], and other scenarios [21,22], we also have confirmed observations from multimessenger astronomy [20,23] and direct observations of the shadow of a supermassive BH [24]. This process is set to drastically increase with the next generation of gravitational wave observatories such as LIGO India [25], the Einstein Telescope [26] and LISA [27], among others, which will drastically increase the number of event observations enlarging the possibility of observing more exotic phenomena.…”

Section: Introductionmentioning

confidence: 99%

Black holes in f(T,B) gravity: exact and perturbed solutions

Bahamonde¹,

Golovnev²,

Guzmán³

et al. 2022

J. Cosmol. Astropart. Phys.

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Spherically symmetric solutions of theories of gravity built one fundamental class of solutions to describe compact objects like black holes and stars. Moreover, they serve as starting point for the search of more realistic axially symmetric solutions which are capable to describe rotating compact objects. Theories of gravity that do not possess spherically symmetric solutions which meet all observational constraints are easily falsified. In this article, we discuss classes of exact and perturbative spherically symmetric solutions in f(T,B)-gravity. The perturbative solutions add to the ones which have already been found in the literature, while the exact solutions are presented here for the first time. Moreover, we present general methods and strategies, like generalized Bianchi identities, to find spherically solutions in modified teleparallel theories of gravity.

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Section: Introductionmentioning

confidence: 99%

Black holes in f(T,B) gravity: exact and perturbed solutions

Bahamonde¹,

Golovnev²,

Guzmán³

et al. 2022

J. Cosmol. Astropart. Phys.

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“…In addition to the BH-BH and NS-NS mergers, BH-NS events constitute another major class of mergers and carry significant implications for multimessenger observations (Ruiz et al 2021). While the detected events are consistent with stellar evolution formation channels (Broekgaarden & Berger 2021), speculations about possible PBH origin, considering that NSs are misidentified solar-mass BHs and detected events correspond to unequal mass PBH-PBH mergers, have already been put forth (Wang & Zhao 2022). As the number of detected events will significantly accumulate in the upcoming future and given their possible implications for fundamental physics, understanding their origin is a pressing matter.…”

Section: Introductionmentioning

confidence: 86%

Establishing the Nonprimordial Origin of Black Hole–Neutron Star Mergers

Sasaki

Takhistov

Vardanyan

et al. 2022

ApJ

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Primordial black holes (PBHs) from the early universe constitute attractive dark matter candidates. First detections of black hole–neutron star (BH–NS) candidate gravitational wave events by the LIGO/Virgo collaboration, GW200105 and GW200115, already prompted speculations about nonastrophysical origin. We analyze, for the first time, the total volumetric merger rates of PBH–NS binaries formed via two-body gravitational scattering, finding them to be subdominant to the astrophysical BH–NS rates. In contrast to binary black holes, a significant fraction of which can be of primordial origin, either formed in dark matter halos or in the early universe, PBH–NS rates cannot be significantly enhanced by contributions preceding star formation. Our findings imply that the identified BH–NS events are of astrophysical origin, even when PBH–PBH events significantly contribute to the gravitational wave observations.

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“…After the announcement of Abbott et al (2021), various works on the population of these binaries have appeared. Wang & Zhao (2022) explained these GW events in a scenario of primordial BH (PBH) binaries (not NS-BHs) that satisfies existing astrophysical/cosmological bounds (see also Chen et al (2021) for another study on a PBH scenario). Sasaki et al (2021) showed that the NS-PBH merger rate is subdominant to the NS-BH rate.…”

Section: Introductionmentioning

confidence: 89%

Neutron star black hole binaries in LIGO/Virgo O3b run were formed from Population I/II binaries

Kinugawa,

Nakamura,

Nakano

2022

Preprint

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Two neutron star (NS)-black hole (BH) binaries, GW200105 and GW200115 found in the LIGO/Virgo O3b run have smaller BH mass of 6-9 M which is consistent with Population I and II origin. Our population synthesis simulations using 10 6 Population I and II binaries with appropriate initial parameters show consistent binary mass, event rate, and no detection of radio pulsar (PSR) and BH binaries in our Galaxy so far. Especially, we found possible progenitors of GW200105 and GW200115 which were formed at redshift z = 0.15 and z = 1.6 with binary mass of (34M , 9.2M ) and (23.7M , 10.6M ), respectively. The final masses of these binaries are (6.85M , 2.14M ) and (6.04M , 1.31M ) which look like (9.0 +1.7 −1.7 M , 1.91 +0.33 −0.24 M ) of GW200105 and (5.9 +2.0 −2.5 M , 1.44 +0.85 −0.29 M ) of GW200115, respectively. We also estimate that 4-20 PSR-BH binaries in our galaxy will be observed by SKA. The existence of NS-BH binaries in our galaxy can be confirmed in future SKA era.

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GW200105 and GW200115 are compatible with a scenario of primordial black hole binary coalescences

Cited by 17 publications

References 36 publications

Black holes in f(T,B) gravity: exact and perturbed solutions

Black holes in f(T,B) gravity: exact and perturbed solutions

Establishing the Nonprimordial Origin of Black Hole–Neutron Star Mergers

Neutron star black hole binaries in LIGO/Virgo O3b run were formed from Population I/II binaries

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