Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..apr.t9002s&link_type=abstract
American Physical Society, APS April Meeting, April 16-19, 2005, abstract #T9.002
Physics
Scientific paper
Inflationary cosmology predicts a low-amplitude graviton background across a wide range of frequencies. We demonstrate that the presence of extra spatial dimensions will modify the primordial graviton spectrum. If the fundamental scale of these extra dimensions is below the reheat temperature, the high-frequency modes of the graviton background may have a thermal spectrum instead. The energy density in this background is significant enough that nucleosynthesis may be affected in a substantial way. Examining the 21-cm hydrogen line may allow for direct detection of a thermal graviton background.
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