Scaling Invariance of Perturbations in k-Inflation Models

Bilić, Nevenko; Dimitrijević, Dragoljub D.; Djordjević, Goran S.; Milošević, Milan; Stojanović, Marko (2025) Scaling Invariance of Perturbations in k-Inflation Models. Universe, 11 (4). ISSN 2218-1997

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Abstract

We study the background and perturbations in k-essence inflation models and show that a general k-essence exhibits a simple scaling property. In particular, we study two classes of k-inflation models with the potential characterized by an inflection point. We demonstrate that these models enjoy scaling properties that could be used to redefine input parameters so that the perturbations spectra satisfy the correct normalization at the CMB pivot scale. The background and perturbation equations are integrated numerically for two specific models.

Item Type:	Article
Uncontrolled Keywords:	k-essence; inflation; cosmological perturbations
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Depositing User:	Ema Buhin Šaler
Date Deposited:	26 Feb 2026 13:00
URI:	http://fulir.irb.hr/id/eprint/11275
DOI:	10.3390/universe11040128

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