Stellar prospects for FRB gravitational lensing

Abstract

Gravitational lensing of fast radio bursts (FRBs) offers an exciting avenue for several cosmological applications. However, it is not yet clear how many such events future surveys will detect nor how to optimally find them. We use the known properties of FRBs to forecast detection rates of gravitational lensing on delay timescales from microseconds to years, corresponding to lens masses spanning fifteen orders of magnitude. We highlight the role of the FRB redshift distribution on our ability to observe gravitational lensing. We consider cosmological lensing of FRBs by stars in foreground galaxies and show that strong stellar lensing will dominate on microsecond timescales. Upcoming surveys such as DSA-2000 and CHORD will constrain the fraction of dark matter in compact objects (e.g. primordial black holes) and may detect millilensing events from intermediate mass black holes (IMBHs) or small dark matter halos. Coherent all-sky monitors will be able to detect longer-duration lensing events from massive galaxies, in addition to short time-scale lensing. Finally, we propose a new application of FRB gravitational lensing that will measure directly the circumgalactic medium of intervening galaxies.

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Cited by in corpus (12)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Gravitational Lensing in Modified Gravity: A case study for Fast Radio Bursts
• GLoW: novel methods for wave-optics phenomena in gravitational lensing
• The unseen host galaxy and high dispersion measure of a precisely-localised Fast Radio Burst suggests a high-redshift origin
• An X-ray Census of Fast Radio Burst Host Galaxies: Constraints on AGN and X-ray Counterparts
• The Cosmic Evolution of Fast Radio Bursts Inferred from the CHIME/FRB Baseband Catalog 1
• Deep Synoptic Array Science: Implications of Faraday Rotation Measures of Localized Fast Radio Bursts
• Combining strongly lensed and unlensed fast radio bursts: To be a more precise late-universe probe
• Strong gravitational lensing with upcoming wide-field radio surveys
• A Multi-Wavelength Survey of Transient Lensing Opportunities for Primordial Black Hole Searches
• Novel understanding of Cosmological Phenomena using Fast Radio Bursts
• Detection of Partial Coherence due to Multipath Propagation for FRB 20220413B with CHIME/FRB