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Domenech, Guillem; Pi, Shi1,2; Sasaki, Misao1,3,4
Induced gravitational waves as a probe of thermal history of the universe
AbstractThe 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.
Cooperation Status国际
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
Indexed BySCIE
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Document Type期刊论文
Affiliation1.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
Recommended Citation
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.
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