5-10 August 2019
Westin Harbour Castle, Toronto Canada
America/Toronto timezone

Freeze-in production of dark matter through spin-1 and spin-2 portals

8 Aug 2019, 11:00
Parallel Session talk Outreach & Theory (Parallel)


Ms Maíra Dutra (Carleton University)


We consider two scenarios where the out-of-equilibrium production of dark matter (DM) particles in the early universe is expected. In the first one, we extend the standard model (SM) of particle physics by a U(1)' gauge group under which all the SM particles are neutral. We then consider DM candidates interacting only with the new spin-1 gauge boson, a heavy Z'. We assume the presence of heavy beyond the SM fermions charged under both U(1)' and SM SU(3), allowing for a feeble connection between DM and SM particles. In the second scenario, we assume that the interaction between DM and SM particles are only mediated by gravitons and massive spin-2 fields, being therefore suppressed by the Planck and an intermediate scales respectively. In both models, we show that the SM particles are able to produce the right amount of DM via freeze-in at most in the early stages of the radiation era. We show that the high temperature dependence of the DM production rates implies that the DM relic density is established during the post-inflationary reheating. Moreover, neglecting the on-shell production of mediators while entropy is being injected into the thermal bath might lead us to underestimate the DM relic density by many orders of magnitude.

Primary authors

Ms Maíra Dutra (Carleton University) Nicolás Bernal (Universidad Antonio Nariño) Mr Yann Mambrini (LPT-Orsay) Keith A. Olive (University of Minnesota (US)) Marco Peloso (University of Minnesota) Dr Mathias Pierre (IFT-Madrid) Gautam Bhattacharyya (Saha Institute of Nuclear Physics)

Presentation Materials