TH Cosmo Coffee

Dark Glueballs and their Ultralight Axions

by Mr Gustavo Salinas (Northeastern University)

4-2-011 - TH common room (CERN)

4-2-011 - TH common room


Show room on map

I discuss dark matter as a mixture of dark glueballs and their associated ultralight axions, a scenario well-motivated from a string theory perspective. Glueballs from a confining hidden gauge sector oversaturate the observed relic density for much of the natural UV parameter space. However, if the dark glueballs are only a fraction of the dark matter and the associated axion has a decay constant near the string scale, then this axion is ultralight and naturally realizes the fuzzy dark matter scenario with a modest tuning of a temperature ratio. The glueball self-interactions are much stronger than the typical self-interacting dark matter bounds. Astrophysical observations constrain the size of the glueball component relative to the axionic component, while electric dipole moments constrain mixing with the QCD axion.

Your browser is out of date!

Update your browser to view this website correctly. Update my browser now