August 23, 2021 to October 7, 2021
Venue: OAC conference center, Kolymbari, Crete, Greece. Participation is possible also via internet.
Europe/Athens timezone

A model of dark photons as dark matter in a multi-temperature universe

Aug 30, 2021, 10:00 AM
Room 1

Room 1


Amin Abou Ibrahim (Institute for theoretical physics, Münster University)


The possibility of a dark photon in the sub-MeV mass range which has a kinetic mixing with the Standard Model to be a dark matter candidate is highly constrained due to the stringent limits from astrophysical experiments as well as $\Delta N_{\rm eff}$. We present a particle physics model comprising of two hidden sectors where one hidden sector has a direct kinetic mixing with the SM while the second hidden sector couples directly only to the first hidden sector. If the dark photon resides in the second hidden sector, then it can only couple to the SM indirectly via the first hidden sector. We show that this set up can produce a dark photon relic density consistent with experiment as well as escape bounds from astrophysical experiments. We solve the coupled Boltzmann equations and trace the temperature evolution of the sectors involved. We show that the temperature gradient between the sectors allows one to add extra relativistic degrees of freedom without violating bounds on $\Delta N_{\rm eff}$.
The talk is based on arXiv:2103.15769 [hep-ph].


Amin Abou Ibrahim, Dr., Institute for theoretical physics -- WWU, Germany,

Is this abstract from experiment? No
Name of experiment and experimental site N/A
Is the speaker for that presentation defined? Yes
Internet talk No

Primary authors

Amin Abou Ibrahim (Institute for theoretical physics, Münster University) Michael Klasen Pran Nath (Northeastern University)

Presentation materials