Elastic Scattering of Cosmological Gravitational Wave Backgrounds: Primordial Black Holes and Stellar Objects

Abstract

Primordial black holes (PBHs) are plausible dark matter candidates that formed from the gravitational collapse of primordial density fluctuations. Current observational constraints allow asteroid-mass PBHs to account for all of the cosmological dark matter. We show that elastic scattering of a cosmological gravitational wave background, these black holes generate spectral distortions on the background of 0.3% for cosmologically relevant frequencies without considering coherent scattering and 5% when the coherent enhancement is included. Scattering from stellar objects induce much smaller distortions. Detectability of this signal depends on our ultimate understanding of the unperturbed background spectrum.

Updated draft to reflect version to appear in JCAP including an appendix of PBH clustering boosting the cross section

References in corpus (24)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Primordial Black Holes as Dark Matter
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• Primordial Black Holes as Dark Matter: Recent Developments
• The merger rate of primordial-black-hole binaries
• Challenges and Opportunities of Gravitational Wave Searches at MHz to GHz Frequencies
• The Spectrum of Gravitational Radiation from Primordial Turbulence
• The Parkes Pulsar Timing Array Third Data Release
• A brief review on primordial black holes as dark matter
• The gravitational-wave background null hypothesis: Characterizing noise in millisecond pulsar arrival times with the Parkes Pulsar Timing Array
• Inflation and Primordial Black Holes
• The NANOGrav 15-Year Data Set: Detector Characterization and Noise Budget
• The Formation Probability of Primordial Black Holes
• PBH formation from spherically symmetric hydrodynamical perturbations: a review
• Primordial Black Holes from Multifield Inflation with Nonminimal Couplings
• Planck Constraints and Gravitational Wave Forecasts for Primordial Black Hole Dark Matter Seeded by Multifield Inflation
• Subtracting Compact Binary Foregrounds to Search for Subdominant Gravitational-Wave Backgrounds in Next-Generation Ground-Based Observatories
• Evading no-go for PBH formation and production of SIGWs using Multiple Sharp Transitions in EFT of single field inflation
• On the derivation of the Kompaneets equation
• The History of Inflation from Microwave Background Polarimetry and Laser Interferometry
• Boltzmann equations for astrophysical Stochastic Gravitational Wave Backgrounds scattering off of massive objects
• Compact Binary Foreground Subtraction in Next-Generation Ground-Based Observatories
• The sensitivity of pulsar timing arrays
• An SZ-Like Effect on Cosmological Gravitational Wave Backgrounds