Quantum fluctuations and CMB anisotropies in one-bubble open inflation models

Kazuhiro Yamamoto, Misao Sasaki, Takahiro Tanaka

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We first develop a method to calculate a complete set of mode functions that describe the quantum fluctuations generated in one-bubble open inflation models. We consider two classes of models. One is a single scalar field model proposed by Bucher, Goldhaber, and Turok and by us as an example of the open inflation scenario, and the other is a two-field model such as the "supernatural" inflation proposed by Linde and Mezhlumian. In both cases we assume the difference in the vacuum energy density between inside and outside the bubble is negligible. There are two kinds of mode functions. One kind has the usual continuous spectrum and the other has a discrete spectrum with characteristic wavelengths exceeding the spatial curvature scale. The latter can be further divided into two classes in terms of its origin. One is called the de Sitter supercurvature mode, which arises due to the global spacetime structure of de Sitter space, and the other is due to fluctuations of the bubble wall. We calculate the spectrum of quantum fluctuations in these models and evaluate the resulting large angular scale CMB anisotropies. We find there are ranges of model parameters that are consistent with observed CMB anisotropies.

Original languageEnglish
Pages (from-to)5014-5030
Number of pages17
JournalPhysical Review B-Condensed Matter
Issue number8
Publication statusPublished - 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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