研究者情報 | 神奈川大学

ヒラノ　シンゴ Hirano Shingo 平野　信吾所属神奈川大学工学部応用物理学科職種助教
言語種別	英語
発行・発表の年月	2015/11
形態種別	学術雑誌
査読	査読あり
標題	EARLY STRUCTURE FORMATION FROM PRIMORDIAL DENSITY FLUCTUATIONS WITH A BLUE, TILTED POWER SPECTRUM
執筆形態	共著
掲載誌名	ASTROPHYSICAL JOURNAL
出版社・発行元	IOP PUBLISHING LTD
巻・号・頁	814(1),pp.18-25
担当区分	筆頭著者,責任著者
国際共著	国際共著
著者・共著者	◎Shingo Hirano,Nick Zhu,Naoki Yoshida,David Spergel,Harold W. Yorke
概要	While observations of large-scale structure and the cosmic microwave background (CMB) provide strong constraints on the amplitude of the primordial power spectrum (PPS) on scales larger than 10 Mpc, the amplitude of the power spectrum on sub-galactic length scales is much more poorly constrained. We study early structure formation in a cosmological model with a blue-tilted PPS. We assume that the standard scale-invariant PPS is modified at small length scales as P(k) similar to k(ms) with m(s) > 1. We run a series of cosmological hydrodynamic simulations to examine the dependence of the formation epoch and the characteristic mass of primordial stars on the tilt of the PPS. In models with m(s) > 1, star-forming gas clouds are formed at z > 100 when the formation of hydrogen molecules is inefficient because the intense CMB radiation destroys chemical intermediates.
DOI	10.1088/0004-637X/814/1/18
ISSN	0004-637X/1538-4357
ORCIDのPut Code	31843090
PermalinkURL	http://orcid.org/0000-0002-4317-767X