Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-07-14
Phys.Rev.D46:4198-4205,1992
Physics
High Energy Physics
High Energy Physics - Phenomenology
(LaTeX 16 pages), 2 figures not included, YCTP-P16-92
Scientific paper
10.1103/PhysRevD.46.4198
We present an in depth discussion of the production of gravitational waves from an inflationary phase that could have occurred in the early universe, giving derivations for the resulting spectrum and energy density. We also consider the large-scale anisotropy in the cosmic microwave background radiation coming from these waves. Assuming that the observed quadrupole anisotropy comes mostly from gravitational waves (consistent with the predictions of a flat spectrum of scalar density perturbations and the measured dipole anisotropy) we describe in detail how to derive a value for the scale of inflation of $(1.5-5)\times 10^{16}$GeV, which is at a particularly interesting scale for particle physics. This upper limit corresponds to a 95\% confidence level upper limit on the scale of inflation assuming only that the quadrupole anisotropy from gravitational waves is not cancelled by another source. Direct detection of gravitational waves produced by inflation near this scale will have to wait for the next generation of detectors.
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