On the Single-Event-Based Identification of Primordial Black Hole Mergers at Cosmological Distances
On the single-event-based identification of primordial black hole mergers at cosmological distances Ken K. Y. Ng,1, 2, 3, ∗ Shiqi Chen,1, 2, 3 Boris Goncharov,4, 5 Ulyana Dupletsa,4, 5 Ssohrab Borhanian,6, 7 Marica Branchesi,4, 5 Jan Harms,4, 5 Michele Maggiore,8 B. S. Sathyaprakash,6, 9, 10 and Salvatore Vitale1, 2, 3 1LIGO, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 2Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 4Gran Sasso Science Institute (GSSI), I-67100 L'Aquila, Italy 5INFN, Laboratori Nazionali del Gran Sasso, I-67100 Assergi, Italy 6Institute for Gravitation and the Cosmos, Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA 7Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universit¨atJena, 07743, Jena, Germany 8D´epartement de Physique Th´eoriqueand Center for Astroparticle Physics, Universit´ede Gen`eve,24 quai Ansermet, CH{1211 Gen`eve4, Switzerland 9Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA, 16802, USA 10School of Physics and Astronomy, Cardiff University, Cardiff, UK, CF24 3AA (Dated: September 14, 2021) The existence of primordial black holes (PBHs), which may form from the collapse of matter overdensities shortly after the Big Bang, is still under debate. Among the potential signatures of PBHs are gravitational waves (GWs) emitted from binary black hole (BBH) mergers at redshifts z & 30, where the formation of astrophysical black holes is unlikely. Future ground-based GW detectors, Cosmic Explorer and Einstein Telescope, will be able to observe equal-mass BBH mergers with total mass of O(10 − 100) M at such distances.
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