منابع مشابه
Inflation from Extra Dimensions
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) ≡ MV ∼ 10−4MP . This gives a large radion mass and reheat t...
متن کاملInflation from Extra Dimensions
A gravity-driven inflation is shown to arise from a simple higher dimensional universe. In vacuum, the shear of n > 1 contracting dimensions is able to inflate the remaining three spatial dimensions. Said another way, the expansion of the 3-volume is accelerated by the contraction of the n-volume. Upon dimensional reduction, the theory is equivalent to a four dimensional cosmology with a dynami...
متن کاملPrimordial Inflation and Present-Day Cosmological Constant from Extra Dimensions
A semiclassical gravitation model is outlined which makes use of Casimir vacuum energy fluctuations in extra compactified dimensions to produce the present-day dark energy density. The model is based on (4+D)-dimensional gravity, with D = 2 extra dimensions with radius b(t) curled up at the ADD length scale b0 ≈ 0.1 mm. Primordial inflation of our three-dimensional space occurs as in the cosmol...
متن کاملF-term Hybrid Inflation, the η-Problem and Extra Dimensions
F-term hybrid inflation models in the context of supergravity generically have corrections to the inflaton mass squared of the order of H2 (the η-problem). In addition they have a problem with large deviations of the spectrum of density perturbations from scale-invariance due to non-renormalizable corrections to the superpotential. Here we show that an increase of the expansion rate at large en...
متن کاملA Supersymmetric Standard Model of Inflation with Extra Dimensions
We embed the supersymmetric standard model of hybrid inflation based on the next-tominimal superpotential term λNHuHd supplemented by an inflaton term κφN2, into an extra-dimensional framework, in which all the Higgs fields and singlets live in the bulk, while all the matter fields live on the brane. All the parameters of the effective 4d model can then be naturally understood in terms of a fun...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1999
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)01256-3