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	Author	Eröncel, C.; Gouttenoire, Y.; Sato, R.; Servant, G.; Simakachorn, P.
	Title	Universal Bound on the Duration of a Kination Era			Type	Journal Article
	Year	2025	Publication	Physical Review Letters	Abbreviated Journal	Phys. Rev. Lett.
	Volume	135	Issue	10	Pages	101002 - 7pp
	Keywords
	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 radiationlike component dominating over the kination background after about 11 e-folds of cosmic expansion. Current constraints on the extra number of neutrino flavors 0Neff 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.
	Address	[Eroncel, Cem] Istinye Univ, Fac Engn & Nat Sci, TR-34396 Istanbul, Turkiye; [Gouttenoire, Yann] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel; [Gouttenoire, Yann] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence & MITP, D-55099 Mainz, Germany; [Sato, Ryosuke] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan; [Servant, Geraldine] Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany; [Servant, Geraldine] Univ Hamburg, Inst Theoret Phys, D-22761 Hamburg, Germany; [Simakachorn, Peera] Univ Valencia, IFIC, CSIC, C Catedrat Jose Beltran 2, E-46980 Paterna, Spain, Email: cem.eroncel@istinye.edu.tr;
	Corporate Author				Thesis
	Publisher	Amer Physical Soc	Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0031-9007	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001564169900014			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6825
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