論文

基本情報

氏名 山内 大介
氏名(カナ) ヤマウチ ダイスケ
氏名(英語) Yamauchi Daisuke
所属 理学部 物理学科
職名 講師
researchmap研究者コード B000327615
researchmap機関 岡山理科大学

題名

Weak lensing generated by vector perturbations and detectability of cosmic strings

単著・共著の別

共著

著者

Daisuke Yamauchi, Toshiya Namikawa, Atsushi Taruya

概要

We study the observational signature of vector metric perturbations through the effect of weak gravitational lensing. In the presence of vector perturbations, the non-vanishing signals for B-mode cosmic shear and curl-mode deflection angle, which have never appeared in the case of scalar metric perturbations, naturally arise. Solving the geodesic and geodesic deviation equations, we drive the full-sky formulas for angular power spectra of weak lensing signals, and give the explicit expressions for E-/B-mode cosmic shear and gradient-/curl-mode deflection angle. As a possible source for seeding vector perturbations, we then consider a cosmic string network, and discuss its detectability from upcoming weak lensing and CMB measurements. Based on the formulas and a simple model for cosmic string network, we calculate the angular power spectra and expected signal-to-noise ratios for the B-mode cosmic shear and curl-mode deflection angle. We find that the weak lensing signals are enhanced for a smaller intercommuting probability of the string network, P, and they are potentially detectable from the upcoming cosmic shear and CMB lensing observations. For P ∼ 10−1, the minimum detectable tension of the cosmic string will be down to Gμ ∼ 5 × 10−8. With a theoretically inferred smallest value P ∼ 10−3, we could even detect the string with Gμ ∼ 5 × 10−10.

発表雑誌等の名称

Journal of Cosmology and Astroparticle Physics

出版者

10

030

開始ページ

終了ページ

発行又は発表の年月

2012/10

査読の有無

有り

招待の有無

無し

記述言語

英語

掲載種別

研究論文(学術雑誌)

ISSN

ID:DOI

10.1088/1475-7516/2012/10/030

ID:NAID(CiNiiのID)

ID:PMID

URL

JGlobalID

arXiv ID

1205.2139

ORCIDのPut Code

DBLP ID