Large-angle cosmic microwave background anisotropy in an open universe in the one-bubble inflationary scenario

Kazuhiro Yamamoto, Misao Sasaki, Takahiro Tanaka

Research output: Contribution to journalArticle

148 Citations (Scopus)

Abstract

We consider an alternative scenario of inflation which can account for a spatially open universe. It is similar to the old inflation in which the bubble nucleation occurs in the sea of the false vacuum, but it differs from the old inflation in that the second slow rollover inflation occurs inside a nucleated bubble. Hence, our observable universe is entirely contained in one nucleated bubble. The significance of the scenario is that apart from a variance caused by model parameters, it gives us a definite prediction on the spectrum of the primordial density perturbations, and hence it is observationally testable. Here we investigate the spectrum of cosmic microwave background anisotropies on large angular scales. We find that the contribution from peculiar modes which never appear in the usual harmonic analysis is significant in the case Ω0 ≲ 0.1.

Original languageEnglish
Pages (from-to)412-418
Number of pages7
JournalAstrophysical Journal
Volume455
Issue number2
DOIs
Publication statusPublished - Dec 20 1995

Fingerprint

inflation
bubble
anisotropy
bubbles
universe
microwaves
harmonic analysis
nucleation
perturbation
vacuum
predictions
microwave
prediction

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Large-angle cosmic microwave background anisotropy in an open universe in the one-bubble inflationary scenario. / Yamamoto, Kazuhiro; Sasaki, Misao; Tanaka, Takahiro.

In: Astrophysical Journal, Vol. 455, No. 2, 20.12.1995, p. 412-418.

Research output: Contribution to journalArticle

@article{62ff99edd7a14999a85c38944345b59e,
title = "Large-angle cosmic microwave background anisotropy in an open universe in the one-bubble inflationary scenario",
abstract = "We consider an alternative scenario of inflation which can account for a spatially open universe. It is similar to the old inflation in which the bubble nucleation occurs in the sea of the false vacuum, but it differs from the old inflation in that the second slow rollover inflation occurs inside a nucleated bubble. Hence, our observable universe is entirely contained in one nucleated bubble. The significance of the scenario is that apart from a variance caused by model parameters, it gives us a definite prediction on the spectrum of the primordial density perturbations, and hence it is observationally testable. Here we investigate the spectrum of cosmic microwave background anisotropies on large angular scales. We find that the contribution from peculiar modes which never appear in the usual harmonic analysis is significant in the case Ω0 ≲ 0.1.",
author = "Kazuhiro Yamamoto and Misao Sasaki and Takahiro Tanaka",
year = "1995",
month = "12",
day = "20",
doi = "10.1086/176588",
language = "English",
volume = "455",
pages = "412--418",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Large-angle cosmic microwave background anisotropy in an open universe in the one-bubble inflationary scenario

AU - Yamamoto, Kazuhiro

AU - Sasaki, Misao

AU - Tanaka, Takahiro

PY - 1995/12/20

Y1 - 1995/12/20

N2 - We consider an alternative scenario of inflation which can account for a spatially open universe. It is similar to the old inflation in which the bubble nucleation occurs in the sea of the false vacuum, but it differs from the old inflation in that the second slow rollover inflation occurs inside a nucleated bubble. Hence, our observable universe is entirely contained in one nucleated bubble. The significance of the scenario is that apart from a variance caused by model parameters, it gives us a definite prediction on the spectrum of the primordial density perturbations, and hence it is observationally testable. Here we investigate the spectrum of cosmic microwave background anisotropies on large angular scales. We find that the contribution from peculiar modes which never appear in the usual harmonic analysis is significant in the case Ω0 ≲ 0.1.

AB - We consider an alternative scenario of inflation which can account for a spatially open universe. It is similar to the old inflation in which the bubble nucleation occurs in the sea of the false vacuum, but it differs from the old inflation in that the second slow rollover inflation occurs inside a nucleated bubble. Hence, our observable universe is entirely contained in one nucleated bubble. The significance of the scenario is that apart from a variance caused by model parameters, it gives us a definite prediction on the spectrum of the primordial density perturbations, and hence it is observationally testable. Here we investigate the spectrum of cosmic microwave background anisotropies on large angular scales. We find that the contribution from peculiar modes which never appear in the usual harmonic analysis is significant in the case Ω0 ≲ 0.1.

UR - http://www.scopus.com/inward/record.url?scp=11944270809&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=11944270809&partnerID=8YFLogxK

U2 - 10.1086/176588

DO - 10.1086/176588

M3 - Article

AN - SCOPUS:11944270809

VL - 455

SP - 412

EP - 418

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -