Emergence of Fluctuations from a Tachyonic Big Bang

Details Emergence of Fluctuations from a Tachyonic Big Bang Emergence of Fluctuations from a Tachyonic Big Bang

2007-06-08

arxiv.org/abs/0706.1104v3

Phys.Rev.D76:083524,2007

Physics

High Energy Physics

High Energy Physics - Theory

8pg, RevTeX4, 1 fig, v2. added refs, v3. added small clarification, 1 ref

Scientific paper

10.1103/PhysRevD.76.083524

It has recently been speculated that the end state of a collapsing universe is a tachyonic big crunch. The time reversal of this process would be the emergence of an expanding universe from a tachyonic big bang. In this framework, we study the emergence of cosmological fluctuations. In particular, we compare the amplitude of the perturbations at tne end of the tachyon phase with what would be obtained assuming the usual vacuum initial conditions. We find that cosmological fluctuations emerge in a thermal state. We comment on the relation to the trans-Planckian problem of inflationary cosmology.

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