Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-04-28
Prog.Theor.Phys.122:1207-1238,2010
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 1figure
Scientific paper
10.1143/PTP.122.1207
We propose one way to regularize the fluctuations generated during inflation, whose infrared (IR) corrections diverge logarithmically. In the case of a single field inflation model, recently, we proposed one solution to the IR divergence problem. There, we introduced new perturbative variables which better mimic actual observable fluctuations, and proved the regularity of correlation functions with respect to these variables. In this paper, we extend our previous discussions to a multi field inflation model. We show that, as long as we consider the case that the non-linear interaction acts for a finite duration, observable fluctuations are free from IR divergences in the multi field model, too. In contrast to the single field model, to discuss observables, we need to take into account the effects of quantum decoherence which pick up a unique history of the universe from various possibilities contained in initial quantum state set naturally in the early stage of the universe.
Tanaka Takahiro
Urakawa Yuko
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