https://doi.org/10.1140/epjp/s13360-024-05882-w
Regular Article
Conversion of high-frequency relic gravitational waves into photons in cosmological magnetic field
1
Department of Physics, Novosibirsk State University, Pirogova 2, 630090, Novosibirsk, Russia
2
Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Science, Institutskaya St. 3, 630090, Novosibirsk, Russia
Received:
12
November
2024
Accepted:
27
November
2024
Published online:
12
December
2024
This work continues the research presented in the article (Dolgov et al. in Universe 10(1):7, 2024), where we estimate the Gertsenshtein effect’s influence on the long-wavelength part of relic gravitational wave spectrum. Here, the differential equation system for the Gertsenshtein effect in Friedman–Lemaitre–Robertson–Walker universe, derived in Dolgov et al. (Universe 10(1):7, 2024), is simplified for gravitational waves in the sub-horizon regime during radiation dominance epoch without taking into account the interaction with primary plasma. Then, the obtained system is solved analytically. As a result of the solution analysis, a conclusion was made about a significant increase of relic GWs with the frequencies 
Hz for magnetic field strength 
nGs in the considered approximation. In addition, at the end of the article model dependence of the result is discussed.
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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.
