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

Probing primordial non-Gaussianity consistency relation with galaxy surveys

単著・共著の別

共著

著者

Daisuke Yamauchi, Keitaro Takahashi

概要

With a radio continuum galaxy survey by the Square Kilometre Array (SKA), a photometric galaxy survey by Euclid, and their combination, we forecast future constraints on primordial non-Gaussianity. We focus on the potential impact of local-type higher-order nonlinear parameters on the parameter estimation and particularly the confirmation of the inflationary consistency inequality. Nonstandard inflationary models, such as multifield models, introduce the scale-dependent stochastic clustering of galaxies on large scales, which is a unique probe of mechanism for generating primordial density fluctuations. Our Fisher matrix analysis indicates that a deep and wide survey provided by SKA is more advantageous to constrain ?NL, while Euclid has a strong constraining power for ?NL due to the redshift information, suggesting that the joint analysis between them is quite essential to break the degeneracy between the nonlinear parameters. The combination of the full SKA and Euclid will achieve the precision level needed to confirm the consistency inequality even for ?NL ≈1.5 and ?NL≈17, though it is still hard for a single survey to confirm it when ?NL ≲2.7.

発表雑誌等の名称

Physical Review D

出版者

93

123506

開始ページ

終了ページ

発行又は発表の年月

2016/06

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

https://doi.org/10.1103/PhysRevD.93.123506

ID:NAID(CiNiiのID)

ID:PMID

URL

JGlobalID

arXiv ID

1509.07585

ORCIDのPut Code

DBLP ID