Gravitational wave signals from the collapse of the first stars |
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| Authors: | R Schneider A Ferrara B Ciardi V Ferrari S Matarrese † |
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| Institution: | Dipartimento di Fisica 'G. Marconi', Universitàdegli Studi di Roma 'La Sapienza' and Sezione INFN ROMA1, Piazzale Aldo Moro 5, 00185 Roma, Italy;Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy;Universitàdegli Studi di Firenze, Dipartimento di Astronomia, Largo Enrico Fermi 5, 50125 Firenze, Italy;Dipartimento di Fisica 'Galileo Galilei', Universitádegli Studi di Padova and Sezione INFN PADOVA, via Marzolo 8, 35131 Padova, Italy |
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| Abstract: | We study the gravitational wave emission from the first stars, which are assumed to be very massive objects (VMOs). We take into account various feedback (both radiative and stellar) effects regulating the collapse of objects in the early Universe and thus derive the VMO initial mass function and formation rate. If the final fate of VMOs is to collapse, leaving very massive black hole remnants, then the gravitational waves emitted during each collapse would be seen as a stochastic background. The predicted spectral strain amplitude in a critical density cold dark matter (CDM) universe peaks in the frequency range ν ≈5×10?4–5×10?3 Hz, where it has a value in the range ≈10?20–10?19 Hz?1/2, and might be detected by the Laser Interferometer Space Antenna ( LISA ). The expected emission rate is roughly 4000 event yr?1, resulting in a stationary discrete sequence of bursts, i.e. a shot-noise signal. |
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| Keywords: | gravitation waves galaxies: formation intergalactic medium cosmology: theory |
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