Extra-dimensional Origins of Chemical Potentials at the Cosmological Collider
Abstract
We study the realization of the chemical potential mechanism in cosmological collider physics in a robust class of inflationary models arising from multiple higher-dimensional gauge fields. The rolling inflaton background corresponds to an electric field in the extra dimension in which charged particles are produced analogously to the Schwinger mechanism, while neutral particles can be produced through non-minimal interactions. We show that particles heavier than the inflationary Hubble scale can be created without Boltzmann suppression in both cases. In particular, charged Kaluza-Klein excitations can be created through minimal gauge interactions. We construct realistic models along these lines consistent with both theoretical and experimental constraints.
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BibTeX
@misc{sundrum2026extradimensional,
title = {{Extra-dimensional Origins of Chemical Potentials at the Cosmological Collider}},
author = {Raman Sundrum and Zhaohui Xu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.00158},
eprint = {2608.00158},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.00158},
}
RIS
TY - UNPB
TI - Extra-dimensional Origins of Chemical Potentials at the Cosmological Collider
AU - Raman Sundrum
AU - Zhaohui Xu
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2608.00158
UR - https://arxiv.org/abs/2608.00158
AB - We study the realization of the chemical potential mechanism in cosmological collider physics in a robust class of inflationary models arising from multiple higher-dimensional gauge fields. The rolling inflaton background corresponds to an electric field in the extra dimension in which charged particles are produced analogously to the Schwinger mechanism, while neutral particles can be produced through non-minimal interactions. We show that particles heavier than the inflationary Hubble scale can be created without Boltzmann suppression in both cases. In particular, charged Kaluza-Klein excitations can be created through minimal gauge interactions. We construct realistic models along these lines consistent with both theoretical and experimental constraints.
ER -