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hep-ph2025
Burdening (or not) gravitational waves in the presence of primordial black holes
Mathieu Gross, Md Riajul Haque, Yann Mambrini
We present the spectrum of primordial gravitational wave (GW) expected from the presence of primordial black holes (PBH) and inflaton in the early Universe. For the first time, we…
hep-ph2025
Phenomenological Constraints on Higgs reheating
Yann Cado, Mathieu Gross, Yann Mambrini +1
In many models of inflation, reheating is realized through a coupling between the inflaton and the Higgs boson. Often, the mass of the inflaton is of order GeV determined…
hep-ph2025
Ultra-Relativistic Freeze-Out During Reheating
Stephen E. Henrich, Mathieu Gross, Yann Mambrini +1
We perform a thorough investigation of (ultra)relativistic freeze-out (UFO) during reheating. While the standard WIMP (non-relativistic freeze-out) and FIMP (freeze-in) paradigms h…