Direct detection of the inflationary gravitational wave background

Details Direct detection of the inflationary gravitational wave background Direct detection of the inflationary gravitational wave background

2005-06-17

arxiv.org/abs/astro-ph/0506422v2

Phys.Rev.D73:023504,2006

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures, RevTex. Revised to match published version: added references, corrected typos and corrected LIGO sensitiv

Scientific paper

10.1103/PhysRevD.73.023504

Inflation generically predicts a stochastic background of gravitational waves over a broad range of frequencies, from those accessible with cosmic microwave background (CMB) measurements, to those accessible directly with gravitational-wave detectors, like NASA's Big-Bang Observer (BBO) or Japan's Deci-Hertz Interferometer Gravitational-wave Observer (DECIGO), both currently under study. Here we investigate the detectability of the inflationary gravitational-wave background at BBO/DECIGO frequencies. To do so, we survey a range of slow-roll inflationary models consistent with constraints from the CMB and large-scale structure (LSS). We go beyond the usual assumption of power-law power spectra, which may break down given the 16 orders of magnitude in frequency between the CMB and direct detection, and solve instead the inflationary dynamics for four classes of inflaton potentials. Direct detection is possible in a variety of inflationary models, although probably not in any in which the gravitational-wave signal does not appear in the CMB polarization. However, direct detection by BBO/DECIGO can help discriminate between inflationary models that have the same slow-roll parameters at CMB/LSS scales.

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