期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 517, 期 4, 页码 5216-5231出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac3013
关键词
gravitational lensing: strong; dark matter; fast radio bursts; gamma-ray bursts
资金
- Australian Research Council Future Fellowship [FT180100321]
- Australian Government [DP200102545]
- Australian Research Council [FT180100321] Funding Source: Australian Research Council
Fast cosmological transients are sensitive to gravitational lensing, and low-mass primordial black holes may contribute to dark matter. Research shows that gravitational lensing can constrain lens mass and explore the detection of unlocalized high-fluence FRBs by future telescopes.
Fast cosmological transients such as fast radio bursts (FRBs) and gamma-ray bursts (GRBs) represent a class of sources more compact than any other cosmological object. As such, they are sensitive to significant magnification via gravitational lensing from a class of lenses which are not well constrained by observations today. Low-mass primordial black holes are one such candidate which may constitute a significant fraction of the Universe's dark matter. Current observations only constrain their density in the nearby Universe, giving fast transients from cosmological distances the potential to form complementary constraints. Motivated by this, we calculate the effect that gravitational lensing from a cosmological distribution of compact objects would have on the observed rates of FRBs and GRBs. For static lensing geometries, we rule out the prospect that all FRBs are gravitationally lensed for a range of lens masses and show that lens masses greater than 10(-5)M(circle dot) can be constrained with 8000 unlocalized high-fluence FRBs at 1.4GHz, as might be detected by the next generation of FRB-finding telescopes.
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