https://doi.org/10.1140/epjp/s13360-024-05097-z
Regular Article
Smearing of primordial gravitational waves
1
Alikhanyan National Laboratory, Center for Cosmology and Astrophysics, Yerevan State University, Yerevan, Armenia
2
School of Physics and Astronomy, Monash University, Clayton, Australia
3
SIA, Sapienza Universita di Roma, Rome, Italy
Received:
28
February
2024
Accepted:
15
March
2024
Published online:
8
April
2024
A mechanism for smearing of the primordial gravitational waves during the radiation-dominated phase of the evolution of the Universe is considered. It is shown that the primordial gravitational waves can possess hyperbolicity features due to their propagation through the matter inhomogeneities. This mechanism of smearing can lead to the flattening of the original gravitational wave spectrum and hence has to be taken into account at the interpretation of the properties of primordial gravitational background on the detection of which are oriented ongoing and forthcoming experimental facilities.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
