Gravitational Lensing Bound On The Average Redshift Of Gamma Ray Bursts In Models With Evolving Lenses

Details Gravitational Lensing Bound On The Average Redshift Of Gamma Ray Bursts In Models With Evolving Lenses Gravitational Lensing Bound On The Average Redshift Of Gamma Ray Bursts In Models With Evolving Lenses

1999-02-10

arxiv.org/abs/astro-ph/9902154v5

Int.J.Mod.Phys. D8 (1999) 507-517

Astronomy and Astrophysics

Astrophysics

23 pages,one plain LaTeX file with three postscript figures This is modified version with recent BATSE efficiency parameter an

Scientific paper

10.1142/S0218271899000353

Identification of gravitationally lensed Gamma Ray Bursts (GRBs) in the BATSE 4B catalog can be used to constrain the average redshift $ < z >$ of the GRBs. In this paper we investigate the effect of evolving lenses on the $< z >$ of GRBs in different cosmological models of universe. The cosmological parameters $\Omega$ and $\Lambda$ have an effect on the $< z >$ of GRBs. The other factor which can change the $< z >$ is the evolution of galaxies. We consider three evolutionary model of galaxies. In particular, we find that the upper limit on $< z >$ of GRBs is higher in evolving model of galaxies as compared to non-evolving models of galaxies.

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