Gravitational Wave Background from Population III Stars
Abstract
We estimate the gravitational wave (GW) background from Population III (Pop III) stars using the results from our hydrodynamic simulations. We calculate gravitational waveforms from matter motions and anisotropic neutrino emissions for single Pop III stars. We find that the GW amplitudes from matter motions are dominant until just after bounce, but those from neutrinos dominate later on at frequencies below ~10 Hz in the GW spectrum. Computing the overall signal produced by the ensemble of such Pop III stars, we find that the resultant density parameter of the GW background peaks at the amplitude of ΩGW~10-10 in the frequency interval ~1-10 Hz. We show that such signals, depending on the formation rate of Pop III stars, can be within the detection limits of future planned interferometers such as DECIGO and BBO in the frequency interval of ~0.1-1 Hz. Our results suggest that the detection of the GW background from Pop III stars can be an important tool for supplying information about star formation history in the early universe.
- Publication:
-
First Stars III
- Pub Date:
- March 2008
- DOI:
- 10.1063/1.2905522
- Bibcode:
- 2008AIPC..990..142S
- Keywords:
-
- 97.20.Wt;
- 98.70.Vc;
- 95.30.Lz;
- 97.60.Lf;
- 95.85.Sz;
- Population III stars;
- Background radiations;
- Hydrodynamics;
- Black holes;
- Gravitational radiation magnetic fields and other observations