Cosmological gravitational waves from isocurvature fluctuations

Gravitational waves induced by large primordial curvature fluctuations may result in a sizable stochastic gravitational wave background. Interestingly, curvature fluctuations are gradually generated by initial isocurvature fluctuations, which in turn induce gravitational waves. Initial isocurvature...

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Bibliographic Details
Published inAAPPS bulletin Vol. 34; no. 1; pp. 4 - 22
Main Author Domènech, Guillem
Format Journal Article
LanguageEnglish
Published Singapore Springer Nature Singapore 01.12.2024
Springer Nature B.V
Springer
Subjects
Astronomy
Astrophysics and Cosmology
Atomic
Black holes
Cosmology
Energy
Fluctuations
Gravitational waves
Linear equations
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Phase transitions
Physics
Physics and Astronomy
Radiation
Review Article
Spacetime
Velocity
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Summary:Gravitational waves induced by large primordial curvature fluctuations may result in a sizable stochastic gravitational wave background. Interestingly, curvature fluctuations are gradually generated by initial isocurvature fluctuations, which in turn induce gravitational waves. Initial isocurvature fluctuations commonly appear in multi-field models of inflation as well as in the formation of scattered compact objects in the very early universe, such as primordial black holes and solitons like oscillons and cosmic strings. Here, we provide a review on isocurvature induced gravitational waves and its applications to dark matter and the primordial black hole dominated early universe.
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ISSN:2309-4710
0218-2203
2309-4710
DOI:10.1007/s43673-023-00109-z