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PreprintarXiv licencearXiv

The onset of the strong backreaction regime in axion inflation, an analytical study

  • Aditya Kulkarni
  • Lorenzo Sorbo
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Abstract

Models where an axion-like inflaton is coupled to a U(1) gauge field are theoretically well motivated and can display a rich phenomenology. The regime in which the quanta of the gauge field strongly backreact on the rolling inflaton has been studied for well more than a decade, and yet we cannot say that it is fully understood. In this paper we present an analytical study of the onset of the strong backreaction regime. Our formalism relies on a Laplace transform to convert a complicated integro-differential equation into the search of the poles of an analytic function. We confirm the existence, previously observed using a completely different formalism, of a stable region of strong backreaction. Our work provides, for the first time, analytical formulae that allow to study the evolution of the system as it transitions from the weak to the strong backreaction regime.

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Cite

BibTeXRIS
BibTeX
@misc{kulkarni2026onset,
  title = {{The onset of the strong backreaction regime in axion inflation, an analytical study}},
  author = {Aditya Kulkarni and Lorenzo Sorbo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2608.29244},
  eprint = {2608.29244},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.29244},
}
RIS
TY  - UNPB
TI  - The onset of the strong backreaction regime in axion inflation, an analytical study
AU  - Aditya Kulkarni
AU  - Lorenzo Sorbo
PY  - 2026
DA  - 2026/10/17
PB  - arXiv
DO  - 10.48550/arxiv.2608.29244
UR  - https://arxiv.org/abs/2608.29244
AB  - Models where an axion-like inflaton is coupled to a U(1) gauge field are theoretically well motivated and can display a rich phenomenology. The regime in which the quanta of the gauge field strongly backreact on the rolling inflaton has been studied for well more than a decade, and yet we cannot say that it is fully understood. In this paper we present an analytical study of the onset of the strong backreaction regime. Our formalism relies on a Laplace transform to convert a complicated integro-differential equation into the search of the poles of an analytic function. We confirm the existence, previously observed using a completely different formalism, of a stable region of strong backreaction. Our work provides, for the first time, analytical formulae that allow to study the evolution of the system as it transitions from the weak to the strong backreaction regime.
ER  -