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G objects and primordial black holes

Marcos M. Flores1, Alexander Kusenko1,2,3, Andrea M. Ghez1, and Smadar Naoz1,4

  • 1Department of Physics and Astronomy, University of California, Los Angeles (UCLA), Los Angeles, California 90095, USA
  • 2Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
  • 3Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland
  • 4Mani L. Bhaumik Institute for Theoretical Physics, Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA

Phys. Rev. D 108, L061301 – Published 7 September, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L061301

Abstract

We suggest that “G objects” recently discovered in the Galactic Center may be clouds of gas bound by the gravitational field of stellar-mass black holes produced in the interactions of sublunar primordial black holes with neutron stars. If dark matter is composed of primordial black holes with masses (10−16–10−10)M⊙, these black holes can be captured by neutron stars in the Galactic Center, where the dark matter density is high. After the capture, the neutron star is consumed by the black hole, resulting in a population of (1−2)M⊙ black holes. These stellar-mass black holes, accompanied by gaseous atmospheres, can account for the observed properties of the G objects, including their resilience to tidal disruption by the supermassive black hole in the Galactic Center, while also producing emission consistent with inferred luminosities.

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