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Stellar prospects for FRB gravitational lensing

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arxiv 2206.14310 v1 pith:BO3BZS3B submitted 2022-06-28 astro-ph.CO astro-ph.HE

Liam Connor , Vikram Ravi This is my paper · ORCID
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keywords lensinggravitationalwilldetecteventsfrbsgalaxiesblack
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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 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Probability of gravitational-wave lensing by intermediate-mass black holes and globular clusters

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    The rate of compound gravitational-wave lensing by intermediate-mass black holes in globular clusters is at most about 10^-3 of galaxy-scale lensed events, disfavoring GW231123 as such an event.

  2. Detection of Partial Coherence due to Multipath Propagation for FRB 20220413B with CHIME/FRB

    astro-ph.HE 2025-12 conditional novelty 6.0 of 10

    FRB 20220413B's components share a common Milky Way scintillation pattern but show no phase-coherent lensing signature, so the complex morphology is not confirmed as plasma lensing.

  3. Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies

    astro-ph.GA 2025-07 conditional novelty 6.0 of 10

    Using 20 low-redshift fast radio burst hosts, the authors find host dispersion measure decreases with stellar mass, a trend that conflicts with the weak-feedback CAMELS-Astrid simulation.

  4. Bounding the photon mass with gravitationally lensed fast radio bursts

    astro-ph.HE 2024-12 conditional novelty 6.0 of 10

    Using the time delay and flux ratio of the lensed FRB candidate FRB 20190308C, the authors derive an upper bound on the photon mass of 5.3e-42 kg for a lens shear of 0.01, and between 2.4e-42 and 2.1e-41 kg over the a...

  5. Constraints on Primordial Black Hole Dressed by Dark Matter Halo from Microlensing Effect of Fast Radio Bursts

    astro-ph.CO 2026-07 conditional novelty 5.0 of 10

    A new conversion formula turns monochromatic bare-PBH microlensing bounds into extended-mass dressed-PBH bounds, and a 10^5-FRB forecast places f_PBH near 10^-4.

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