A universal bound on the duration of a kination era
arXiv:2501.17226 · doi:10.1103/k7ty-gwjg
Abstract
We show that primordial adiabatic curvature fluctuations generate an instability of the scalar field sourcing a kination era. We demonstrate that the generated higher Fourier modes constitute a radiation-like component dominating over the kination background after about e-folds of cosmic expansion. Current constraints on the extra number of neutrino flavors thus imply the observational bound of approximately 10 e-folds, representing the most stringent bound to date on the stiffness of the equation of state of the pre-Big-Bang-Nucleosynthesis universe.
5 pages, 2 figures + appendix (10 pages). Published in PRL
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