Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-04-29
Phys.Rev.D61:023513,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 figures, uses epsf.tex
Scientific paper
10.1103/PhysRevD.61.023513
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 M_P. 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} = M_v ~ 10^{-4} M_P. This gives a large radion mass and reheat temperature ~ 10^9 GeV, thus avoiding the moduli problem. Such a value of M_v 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 M_v may hold even if inflation is driven by matter fields rather than by the radion.
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