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Stochastic backgrounds of relic gravitons, T$\Lambda$CDM paradigm and the stiff ages
Absent any indirect tests on the thermal history of the Universe prior to the formation of light nuclear elements, it is legitimate to investigate situations where, before nucleosyntheis, the sound speed of the plasma was larger than $c/\sqrt{3}$, at most equalling the speed of light $c$. In this pl...
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| Lenguaje: | eng |
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2008
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| Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2008.07.107 http://cds.cern.ch/record/1115023 |