Limits on the cosmological abundance of supermassive compact objects from a millilensing search in gamma-ray burst data

Abstract

A new search for the gravitational lens effects of a significant cosmological density of supermassive compact objects (SCOs) on gamma-ray bursts has yielded a null result. We inspected the timing data of 774 BATSE-triggered GRBs for evidence of millilensing: repeated peaks similar in light-curve shape and spectra. Our null detection leads us to conclude that, in all candidate universes simulated, ${\Omega }_{SCO}<0.1$ is favored for $10^5<M_{SCO}/M_{\odot }<10^9$, while in some universes and mass ranges the density limits are as much as 10 times lower. Therefore, a cosmologically significant population of SCOs near globular cluster mass neither came out of the primordial universe, nor condensed at recombination.

14 pages including 3 figures, appeared 2001 January 22

References in corpus (1)

• Limits on the cosmological abundance of supermassive compact objects from a search for multiple imaging in compact radio sources

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