Induced gravitational waves as a probe of thermal history of the universe

doi:10.1088/1475-7516/2020/08/017

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	Induced gravitational waves as a probe of thermal history of the universe
	Domenech, Guillem ; Pi, Shi 1,2; Sasaki, Misao 1,3,4
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2020
期号	8 页码:17
关键词	RADIATION VACUUM SPECTRUM
ISSN号	1475-7516
DOI	10.1088/1475-7516/2020/08/017
英文摘要	The scalar perturbation induced gravitational waves are a probe of the primordial density perturbation spectrum on small scales. In this paper, we show that they can also probe the thermal history of the universe. We assume the universe underwent a stage with a constant equation of state parameter w, followed by the radiation-dominated stage of the conventional big bang universe. We find that the infrared slope of the power spectrum of the induced stochastic gravitational wave background for decelerating cosmologies is related to the equation of state of the universe. Furthermore, the induced gravitational wave spectrum has in general a broken power-law shape around the scale of reheating. Interestingly, below the threshold w = 0 of the equation of state parameter, the broken power-law presents a peak for a Dirac delta peak in the scalar spectrum. For a finite width peak, the threshold changes to w = -1/15 depending on the value of the width. In some cases, such a broken power-law gravitational wave spectrum may degenerate to the spectrum from other sources like phase transitions or global cosmic strings.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27364]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Heidelberg Univ, Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany 2.Kavli Inst Phys & Math Universe WPI, Chiba 2778583, Japan 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 4.Kyoto Univ, Ctr Gravitat Phys, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan 5.Natl Taiwan Univ, Leung Ctr Cosmol & Particle Astrophys, Taipei 10617, Taiwan
推荐引用方式 GB/T 7714	Domenech, Guillem,Pi, Shi,Sasaki, Misao. Induced gravitational waves as a probe of thermal history of the universe[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2020(8):17.
APA	Domenech, Guillem,Pi, Shi,&Sasaki, Misao.(2020).Induced gravitational waves as a probe of thermal history of the universe.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(8),17.
MLA	Domenech, Guillem,et al."Induced gravitational waves as a probe of thermal history of the universe".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .8(2020):17.