Cosmological Gravitational Wave Backgrounds

Details Cosmological Gravitational Wave Backgrounds Cosmological Gravitational Wave Backgrounds

1998-09-28

arxiv.org/abs/astro-ph/9809364v1

Astronomy and Astrophysics

Astrophysics

8 pages, LaTex, to appear in the "Second International LISA Symposium on Gravitational Waves", ed. W. Folkner (AIP, in press)

Scientific paper

10.1063/1.57425

An overview is presented of possible cosmologically distant sources of gravitational wave backgrounds, especially those which might produce detectable backgrounds in the LISA band between 0.1 and 100 mHz. Examples considered here include inflation-amplified vacuum fluctuations in inflaton and graviton fields, bubble collisions in first-order phase transitions, Goldstone modes of classical self-ordering scalars, and cosmic strings and other gauge defects. Characteristic scales and basic mechanisms are reviewed and spectra are estimated for each of these sources. The unique impact of a LISA detection on fundamental physics and cosmology is discussed.

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