Curvature-Assisted Dynamical Compactification in a Pre-Inflationary Higher-Dimensional Universe

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Autore principale:	Yamada, Yusuke
Natura:	Preprint
Pubblicazione:	2026
Soggetti:	High Energy Physics - Theory
Accesso online:	Acceder al recurso
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author	Yamada, Yusuke
author_facet	Yamada, Yusuke
contents	We investigate a pre-inflationary dynamical compactification scenario in which a higher-dimensional expanding universe evolves into an effectively four-dimensional one through curvature-assisted modulus trapping. To obtain a calculable semiclassical realization, we consider a simple five-dimensional $S^1$ compactification in a time-dependent open FRW background. Bulk quantum fields generate both the late-time Casimir contribution that stabilizes the radion and the early-time Kaluza-Klein thermal contributions relevant for the cosmological evolution. We show that negative curvature can sustain tracker-like radion evolution, allowing the radion to be trapped in a compactified vacuum before a subsequent four-dimensional inflationary phase dilutes the curvature remnant. While our analysis is performed in a 5D toy model, it illustrates a broader mechanism by which dynamical compactification can arise in a pre-inflationary higher-dimensional cosmology.
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_25569
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Curvature-Assisted Dynamical Compactification in a Pre-Inflationary Higher-Dimensional Universe Yamada, Yusuke High Energy Physics - Theory We investigate a pre-inflationary dynamical compactification scenario in which a higher-dimensional expanding universe evolves into an effectively four-dimensional one through curvature-assisted modulus trapping. To obtain a calculable semiclassical realization, we consider a simple five-dimensional $S^1$ compactification in a time-dependent open FRW background. Bulk quantum fields generate both the late-time Casimir contribution that stabilizes the radion and the early-time Kaluza-Klein thermal contributions relevant for the cosmological evolution. We show that negative curvature can sustain tracker-like radion evolution, allowing the radion to be trapped in a compactified vacuum before a subsequent four-dimensional inflationary phase dilutes the curvature remnant. While our analysis is performed in a 5D toy model, it illustrates a broader mechanism by which dynamical compactification can arise in a pre-inflationary higher-dimensional cosmology.
title	Curvature-Assisted Dynamical Compactification in a Pre-Inflationary Higher-Dimensional Universe
topic	High Energy Physics - Theory
url	https://arxiv.org/abs/2604.25569

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