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Résumé |
Cosmological inflation is nowadays well installed at the edge of the standard
model cosmology as it solves several shortcomings of the ΛCDM model. However,
this
accelerated growth of the universe should crucially transition to radiation
domination for the late universe evolution to occur. This mandatory feature called
“reheating” can be achieved in different ways depending on the shape of the
inflationary potential and how the inflaton field couples to matter.
In this talk, we will discuss how to go beyond the usual assumptions of
instantaneous reheating in the context of single-field slow-roll inflation,
focusing more specifically on perturbative reheating and its impact on particle
production, such as relativistic dark matter. We will then briefly discuss the
high-frequency gravitational wave signals emerging from particle reheating before
presenting how primordial black holes could achieve reheating and lead to a more
reachable GW signal. We will finally discuss their local thermal effects on dark
matter production. |
