Primordial Black Hole Microlensing: The Einstein Crossing Time Distribution

Abstract

Gravitational microlensing is one of the few means of finding primordial black holes (PBHs), if they exist. Recent LIGO detections of 30 Msun black holes have re-invigorated the search for PBHs in the 10-100 Msun mass regime. Unfortunately, individual PBH microlensing events cannot easily be distinguished from stellar lensing events from photometry alone. However, the distribution of microlensing timescales (tE, the Einstein radius crossing time) can be analyzed in a statistical sense using models of the Milky Way with and without PBHs. While previous works have presented both theoretical models and observational constrains for PBHs (e.g. Calcino et al. 2018; Niikura et al. 2019), surprisingly, they rarely show the observed quantity -- the tE distribution -- for different abundances of PBHs relative to the total dark matter mass (fPBH). We present a simple calculation of how the tE distribution changes between models with and without PBHs.

RNAAS

References in corpus (4)

• Primordial Black Holes as Dark Matter
• Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events
• Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
• Updating the MACHO fraction of the Milky Way dark halo with improved mass models

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• Hunting gravitational wave black holes with microlensing
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• Dark Classification Matters: Searching for Primordial Black Holes with LSST
• Corrections to Hawking Radiation from Asteroid Mass Primordial Black Holes: I. Formalism of Dissipative Interactions in Quantum Electrodynamics
• Exploring Faraday rotation signatures and population bounds for primordial magnetic black holes