Academic Thesis

Basic information

Name Yamauchi Daisuke
Belonging department Physics
Occupation name
researchmap researcher code B000327615
researchmap agency Okayama University of Science

Title

Effect of cosmic strings with delayed scaling on CMB anisotropy

Bibliography Type

Joint Author

Author

Kohei Kamada, Yuuhei Miyamoto, Daisuke Yamauchi, Jun'ichi Yokoyama

Summary

The network of cosmic strings generated in a phase transition during inflation enters the scaling regime later than that of usual strings. If it occurs after the recombination, temperature anisotropies of the cosmic microwave background (CMB) at high multipole moments are significantly reduced. In this paper, we study such effects qualitatively and show that the constraint on the cosmic string tension from the CMB temperature anisotropies and B-mode polarizations can be relaxed. It is shown to be difficult to explain the recent BICEP2 and POLARBEAR results in terms of signals induced by cosmic strings alone even if we take into account the delayed scaling. However, the inflationary tensor-to-scalar ratio required to explain the observed B-mode signals can be slightly reduced to be consistent with the Planck constraint.

Magazine(name)

Physical Review D

Publisher

Volume

90

Number Of Pages

083502

StartingPage

EndingPage

Date of Issue

2014/10

Referee

Exist

Invited

Not exist

Language

English

Thesis Type

Research papers (academic journals)

ISSN

DOI

https://doi.org/10.1103/PhysRevD.90.083502

NAID

PMID

URL

J-GLOBAL ID

arXiv ID

1407.2951

ORCID Put Code

DBLP ID