Particle Production from Geometric Transition in Expanding Universe
arXiv:1309.7582
Abstract
The geometric transitions from the evolution in the complex plane of time provide channels for particle production for a quantum field in expanding universes. The production rate for one pair is obtained by squaring and summing the scattering matrix between the in-vacuum and the transported one over all possible independent closed paths of winding number 1.
Latex 4 pages, 1 figure; Proceedings of APPC12, to be published in J. Phys. Soc. Japan, Supplement