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Relic gravitons from stiff curvature perturbations
The tensor modes reentering the Hubble radius when the plasma is dominated by a stiff fluid lead to a spectral energy density whose blue slope depends on the total post-inflationary sound speed. This result gets however corrected by a secondary (gauge-dependent) term coming from the curvature inhomo...
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| Lenguaje: | eng |
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2020
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| Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2020.135801 http://cds.cern.ch/record/2723994 |