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Viscous absorption of ultra-high-frequency gravitons
The high-frequency gravitons can be absorbed by the first and second viscosities of the post-inflationary plasma as the corresponding wavelengths reenter the Hubble radius prior to big-bang nucleosynthesis. When the total sound speed of the medium is stiffer than radiation the rate of expansion stil...
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| Lenguaje: | eng |
| Publicado: |
2021
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| Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2022.137071 http://cds.cern.ch/record/2791649 |