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High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
Abstract:
It has recently been argued by Copeland et al. that in eleven dimensions two
orbifold planes can collide and bounce in a regular way, even when the bulk
metric is perturbed away from Milne spacetime to a Kasner solution. In this
paper, we point out that as a consequence the global "phoenix" structure of the
cyclic universe is significantly enriched. Spatially separated regions, with
different density fluctuation amplitudes as well as different non-gaussian
characteristics, are all physically realized. Those regions containing by far
the most structure are specified by a fluctuation amplitude of Q ~ 10^{-4.5}
and local non-gaussianity parameters f_{NL} ~ O(+/- 10) and g_{NL} ~ O(-10^3),
in agreement with current observations.
