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The propagating speed of relic gravitational waves and their refractive index during inflation
If the refractive index of the tensor modes increases during a conventional inflationary stage of expansion the relic graviton spectrum is tilted towards high frequencies. Two apparently diverse parametrizations of this effect are shown to be related by a rescaling of the four-dimensional metric thr...
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| Lenguaje: | eng |
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2018
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| Acceso en línea: | https://dx.doi.org/10.1140/epjc/s10052-018-5931-9 http://cds.cern.ch/record/2311411 |