Observing Cosmological Processes in Real Time with Repeating Fast Radio Bursts

Abstract

It is noted that the duration of a fast radio burst (FRB), about $10^{-3}$ s, is a smaller fraction of the time delay between multiple images of a source gravitationally lensed by a galaxy or galaxy cluster than the human lifetime is to the age of the universe. Thus repeating, strongly lensed FRBs may offer an unprecedented opportunity for observing cosmological evolution in "real time". The possibility is discussed of observing cosmic expansion, transverse proper motion, mass accretion and perhaps growth of density perturbations, as a function of redshift.

9 pages, 1 figure, 2 tables. V2: some corrections made. Accepted for publication

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• Constraining Primordial Black Holes using Fast Radio Burst Gravitational-Lens Interferometry with CHIME/FRB
• Searching for Gravitational Waves with Strongly Lensed Repeating Fast Radio Bursts
• Packed Ultra-wideband Mapping Array (PUMA): Astro2020 RFI Response
• Fast Radio Burst Tomography of the Unseen Universe
• Gravitational lensing in the presence of plasma scattering with application to Fast Radio Bursts
• Multiply-imaged time-varying sources behind galaxy clusters - Comparing FRBs to QSOs, SNe, and GRBs
• Testing the Equivalence Principle with Strong Lensing Time Delay Variations
• Probing Gravitational Slip with Strongly Lensed Fast Radio Bursts
• Dark photon dark matter and fast radio bursts
• Solar System-scale interferometry on fast radio bursts could measure cosmic distances with sub-percent precision
• How limiting is optical follow-up for fast radio burst applications? Forecasts for radio and optical surveys
• Combining strongly lensed and unlensed fast radio bursts: To be a more precise late-universe probe
• Redshift dependence of FRB host dispersion measures across cosmic epochs
• Lensed fast radio bursts as a probe of time-varying gravitational potential induced by wave dark matter
• Lensing cosmic drift
• Accelerated expansion as manifestation of gravity: when Dark Energy belongs to the left
• Constraining Primordial Black Hole Dark Matter with CHIME Fast Radio Bursts