Establishing the Non-Primordial Origin of Black Hole-Neutron Star Mergers

Sasaki, Misao; Takhistov, Volodymyr; Vardanyan, Valeri; Zhang, Ying-li

doi:10.48550/arxiv.2110.09509

Cited by 4 publications

(4 citation statements)

References 69 publications

(78 reference statements)

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“…8 We do not address the possibility of mixed astrophysical-PBH mergers (i.e. binaries formed dynamically with a compact object coming from each population) because, generally, the merger rates produced by dynamical capture are insufficient to explain the observed events under reasonable assumptions on the dark matter overdensity in star clusters [32,177,178]. We note, however, that multiple exchange interactions may boost the formation rate for those mixed objects, as suggested in Refs.…”

Section: B Gwtc-3-like Events As Observed By 3g Detectorsmentioning

confidence: 98%

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

et al. 2022

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A population of primordial black holes formed in the early Universe could contribute to at least a fraction of the black-hole merger events detectable by current and future gravitational-wave interferometers. With the ever-increasing number of detections, an important open problem is how to discriminate whether a given event is of primordial or astrophysical origin. We systematically present a comprehensive and interconnected list of discriminators that would allow us to rule out, or potentially claim, the primordial origin of a binary by measuring different parameters, including redshift, masses, spins, eccentricity, and tidal deformability. We estimate how accurately future detectors (such as the Einstein Telescope and LISA) could measure these quantities, and we quantify the constraining power of each discriminator for current interferometers. We apply this strategy to the GWTC-3 catalog of compact binary mergers. We show that current measurement uncertainties do not allow us to draw solid conclusions on the primordial origin of individual events, but this may become possible with next-generation ground-based detectors.

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Section: B Gwtc-3-like Events As Observed By 3g Detectorsmentioning

confidence: 98%

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

et al. 2022

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“…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. Shao & Li (2021) have studied merging BH binaries with compact star systematically based on binary evolution calculations which can reproduce the distributions of known Galactic binaries and obtained the NS-BH merger rate density of 10.2-71.7 yr −1 Gpc −3 .…”

Section: Introductionmentioning

confidence: 99%

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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“…Nevertheless, the PBHs hypothesis might have various astrophysical manifestations, such as gravitational waves (GWs) from black holes merging, nature of high redshift quasars, production of DM halos, etc. The registration of GWs by LIGO/Virgo [16] has inspired a renewed interest in PBHs [17][18][19][20][21][22][23][24][25] because the GWs events are difficult to explain by stellar origin [26]. The PBHs could be responsible for the formation of early DM halos [27] at z > 10, which could explain the near-IR cosmic infrared background fluctuations [28].…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Merger Rate of Primordial Black Holes in a Cluster

2022

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The PBH clusters can be sources of gravitational waves, and the merger rate depends on the spatial distribution of PBHs in the cluster which changes over time. It is well known that gravitational collisional systems experience the core collapse that leads to significant increase of the central density and shrinking of the core. After core collapse, the cluster expands almost self-similarly (i.e., density profile extends in size without changing its shape). These dynamic processes affect the merger rate of PBHs. In this paper, the dynamics of the PBH cluster is considered using the Fokker–Planck equation. We calculate the merger rate of PBHs on cosmic time scales and show that its time dependence has a unique signature. Namely, it grows by about an order of magnitude at the moment of core collapse which depends on the characteristics of the cluster, and then decreases according to the dependence R∝t−1.48. It was obtained for monochromatic and power-law PBH mass distributions with some fixed parameters. Obtained results can be used to test the model of the PBH clusters via observation of gravitational waves at high redshift.

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Establishing the Non-Primordial Origin of Black Hole-Neutron Star Mergers

Cited by 4 publications

References 69 publications

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

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

Dynamics and Merger Rate of Primordial Black Holes in a Cluster

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