Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-12
Phys.Rev. D72 (2005) 084001
Astronomy and Astrophysics
Astrophysics
9 revtex pages, 8 ps figures included, considerably extended version with detailed discussion of uncertainties due to supernov
Scientific paper
10.1103/PhysRevD.72.084001
Based on new developments in the understanding of supernovae (SNe) as gravitational-wave (GW) sources we estimate the GW background from all cosmic SNe. For a broad range of frequencies around 1 Hz, this background is crudely comparable to the GW background expected from standard inflationary models. While our estimate remains uncertain within several orders of magnitude, the SN GW background may become detectable by second-generation space-based interferometers such as the proposed Big-Bang Observatory (BBO). By the same token, the SN GWs may become a foreground for searches of the inflationary GWs, in particular for sub-Hz frequencies where the SN background is Gaussian and where the BBO will be most sensitive. SN simulations lasting far beyond the usual cutoff of about 1 second are needed for more robust predictions in the sub-Hz frequency band. An even larger GW background can arise from a hypothetical early population of massive stars, although their GW source strength as well as their abundance are currently poorly understood.
Buonanno Alessandra
Janka Hans-Thomas
Mueller Ewald
Sigl Guenter
~Raffelt Georg G.
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