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General SIGW source for reheating dynamics

General Relativity and Quantum Cosmology 2026-05-28 v2 High Energy Physics - Phenomenology
Authors: M. Laine , S. Procacci
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Abstract

Working in an arbitrary gauge, we derive the source term for scalar-induced gravitational waves (SIGW) valid during a general reheating epoch. The dominant energy component is allowed to transition smoothly from an inflaton field to a set of fluids, possibly via a period of matter domination. Gauge invariance is verified up to second order.

Keywords

gravitational waves

Cite

@article{arxiv.2512.04482,
  title  = {General SIGW source for reheating dynamics},
  author = {M. Laine and S. Procacci},
  journal= {arXiv preprint arXiv:2512.04482},
  year   = {2026}
}

Comments

17 pages. v2: clarifications added, literature comparison extended, journal version

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R2 v1 2026-07-01T08:08:54.947Z