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Smearing of primordial gravitational waves

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Abstract

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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Data Availability Statement

Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.

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Acknowledgements

We thank the referee for valuable comments. M.S. is acknowledging the ANSEF grant 23AN:PS-astroth-2922.

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Authors and Affiliations

  1. Alikhanyan National Laboratory, Center for Cosmology and Astrophysics, Yerevan State University, Yerevan, Armenia

    M. Samsonyan & V. G. Gurzadyan

  2. School of Physics and Astronomy, Monash University, Clayton, Australia

    A. A. Kocharyan

  3. SIA, Sapienza Universita di Roma, Rome, Italy

    V. G. Gurzadyan

Authors
  1. M. Samsonyan
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  2. A. A. Kocharyan
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  3. V. G. Gurzadyan
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Correspondence to V. G. Gurzadyan.

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Samsonyan, M., Kocharyan, A.A. & Gurzadyan, V.G. Smearing of primordial gravitational waves. Eur. Phys. J. Plus 139, 317 (2024). https://doi.org/10.1140/epjp/s13360-024-05097-z

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  • DOI: https://doi.org/10.1140/epjp/s13360-024-05097-z

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