General SIGW source for reheating dynamics

2025/12/04 by Laine, M., Procacci, S.
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2512.04482

Abstract

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

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• Thermal Gravitational Waves During Reheating
• Constraining the General Oscillatory Inflaton Potential with Freeze-in Dark Matter and Gravitational Waves