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arXiv · 2607.20625

Reheating the FCC: Probing Early Matter Domination with Long-Lived Particles

Nicolás Bernal·Giovanna Cottin·Kuldeep Deka·Manuel López
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Abstract

We study a GeV-scale Higgs-portal scalar $\phi$ that can dominate the early Universe and later decay into Standard Model states, ending an early matter-dominated era. Ordinary cosmic reheating is the minimal example of this scenario. The small Higgs mixing makes $\phi$ a long-lived particle (LLP), linking the reheating temperature $T_\text{rh}$ to displaced-decay signatures at colliders. Including finite-temperature suppression of the decay width, we map FCC-hh LLP sensitivity onto the $[m_{\phi}, T_\text{rh}]$ plane. We find that FCC-hh displaced searches could probe GeV-scale transition temperatures, up to the electroweak scale within the broken-phase Higgs-portal description.

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Nicolás Bernal, Giovanna Cottin, Kuldeep Deka, Manuel López. 2026-07-22. Reheating the FCC: Probing Early Matter Domination with Long-Lived Particles. https://arxiv.org/abs/2607.20625

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