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Displaced vertices at colliders, arising from the production and decay oflong-lived particles, probe dark matter candidates produced via freeze-in. Ifone assumes a standard cosmological history, these decays happen inside thedetector only if the dark matter is very light because of the relic densityconstraint. Here, we argue how displaced events could very well point tofreeze-in within a non-standard early universe history. Focusing on thecosmology of inflationary reheating, we explore the interplay between thereheating temperature and collider signatures for minimal freeze-in scenarios.Observing displaced events at the LHC would allow to set an upper bound on thereheating temperature and, in general, to gather indirect information on theearly history of the universe.

Displaced new physics at colliders and the early universe before its first second