The star formation rate density and the stochastic background of gravitational waves

Details The star formation rate density and the stochastic background of gravitational waves The star formation rate density and the stochastic background of gravitational waves

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jphcs..32..323d&link_type=abstract

Journal of Physics: Conference Series, Volume 32, Issue 1, pp. 323-326 (2006).

Physics

Scientific paper

There is in the literature a number of papers addressing the stochastic background of gravitational waves (GWs) generated by an ensemble of astrophysical sources. The main ingredient in such studies is the so called star formation rate density (SFRD), which gives the density of stars formed per unit time. Some authors argue, however, that there is, in the equation that determines the amplitude of the stochastic background of GWs, an additional (1 + z) term dividing the SFRD, which would account for the effect of cosmic expansion onto the time variable. We argue here that the inclusion of this additional term is wrong. In order to clarify where the inclusion of the (1 + z) term is really necessary, we briefly discuss the calculation of event rates in the study of GRBs (gamma ray bursts) from cosmological origin.

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