Inflatonless Inflation [PDF]
Chiu Man Ho, Thomas W. KephartWe consider a 4+N dimensional Einstein gravity coupled to a non-linear sigma model. This theory admits a solution in which the N extra dimensions contract exponentially while the ordinary space expand exponentially. Physically, the non-linear sigma fields induce the dynamical compactification of the extra dimensions, which in turn drives inflation. No inflatons are required.View original: http://arxiv.org/abs/1002.4044
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