Physics – High Energy Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..488...64c&link_type=abstract
"High energy physics at the millennium: MRST (Montreal-Rochester-Syracuse-Ontario)'99 "The sundarfest". AIP Conference Proceedi
Physics
High Energy Physics
Unified Field Theories And Models, Gravity In More Than Four Dimensions, Kaluza-Klein Theory, Unified Field Theories, Alternative Theories Of Gravity
Scientific paper
The radial mode of n extra compact dimensions (the radion, b) can cause inflation in theories where the fundamental gravity scale, M, is smaller than the Planck scale MP. For radion potentials V(b) with a simple polynomial form, to get the observed density perturbations, the energy scale of V(b) must greatly exceed M~1 TeV: V(b)1/4≡MV~10-4MP. This gives a large radion mass and reheat temperature ~109 GeV, thus avoiding the moduli problem. Such a value of MV can be consistent with the classical treatment if the new dimensions started sufficiently small. A new possibility is that b approaches its stable value from above during inflation. The same conclusions about MV may hold even if inflation is driven by matter fields rather than by the radion.
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