Work

Self-tracking solutions for asymptotic scalar fields

Year: 2025

Type: article

Abstract: A bstract We explore the dynamics of pure scalar fields rolling on an exponential potential in the absence of any additional background fluid and demonstrate the existence of self-tracking solutions in which the self-perturbations of the scalar field act as an effective radiation background. The validity of these solutions is demonstrated through both analytic techniques and numerical simulations using $$ \mathcal{C}\textrm{osmo}\mathcal{L}\textrm{attice} $$ C osmo L attice . We discuss applications to string cosmologies with significant trans-Planckian field excursions between inflation and BBN, including the required initial level of scalar perturbations to avoid overshoot.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep12(2025)135

Authors: Martin Mosny, Joseph P. Conlon, Edmund J. Copeland

Institutions: University of Oxford, University of Nottingham

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: Science and Technology Facilities Council, St. John's College, University of Oxford, Central Laser Facility, Science and Technology Facilities Council