GenHET Meeting in Beyond the Standard Model

Session

Lightning Talks - 3

27 Feb 2026, 11:00

4/3-006 - TH Conference Room (CERN)

2. The Case for Low Reheating Temperatures from Gravitational Particle Production and Multi-Stage Reheating

Francesco Costa (Dublin Institute for Advanced Studies, STP)

27/02/2026, 11:00

The early Universe is an efficient source of particle production, particularly for light scalar fields. We study the generation of stable scalars that interact only through gravity, focusing on their production during inflation and throughout single- and multi-stage reheating. Gravitational particle production mechanisms are known to be highly efficient and can easily lead to an overabundant...

45. Beyond one loop phase transitions

Ms Jasmine Thomson-Cooke (Dublin Institute for Advanced Studies)

27/02/2026, 11:10

Previous work has shown that the standard Coleman-Weinberg one loop effective potential with one loop thermal masses is both gauge and renormalisation dependent. It also poorly predicts the critical temperature of the electroweak phase transition compared to lattice simulations. One can improve on this approach by using the dimensionally reduced effective potential generated by DRalgo. However...

46. Ultralight Vector Dark Matter from non-slowroll Inflation

Martina La Rosa (Università degli Studi di Padova, INFN Padova)

27/02/2026, 11:20

The longitudinal mode of a massive vector field, generated during inflation, offers a well motivated and phenomenologically rich candidate for dark matter. We show that a rapid variation in the mass of the vector boson, occurring during a brief phase of non-slowroll inflationary evolution, can naturally give rise to extremely small vector masses after inflation ends, corresponding to an...