Observational signatures of pre-inflationary and lower dimensional effective gravity

Details Observational signatures of pre-inflationary and lower dimensional effective gravity Observational signatures of pre-inflationary and lower dimensional effective gravity

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012cqgra..29h5010r&link_type=abstract

Classical and Quantum Gravity, Volume 29, Issue 8, pp. 085010 (2012).

Physics

Scientific paper

Several alternative ways to quantize gravitational interactions seem to indicate that gravity at short distances is effectively two dimensional. If this is true, and the energy scale at which the dimensional transition occurs is of the order of the inflationary one, it is reasonable to investigate eventual signatures in the primordial perturbation spectra. In this paper, we look at this possibility by assuming that the inflationary era was preceded by an effectively two-dimensional evolution of the Universe. We model the transition with mode matching and show that, in this case, observational signatures are expected neither in the tensor and scalar power spectra nor in their ratio. We also show that assuming modified dispersion relations before the matching between two sets of four-dimensional modes leads to similar results.

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