Glueballs after String Pheno 18

In this particular occasion the SPLE-Club will take place in the Red Seminar room. The plan is

11:30 - 12:00  summary of String Pheno 18

12:00 - 13:00  seminar by G. Salinas  "Dark glueballs and their ultralight axions"

Abstract:

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.

ERC-SPLE organizes a bi-weekly journal club, the SPLE-club, in which IFT members and visitors interested in string model building and related topics gather to discuss recent papers, new results, and enjoy interesting expositions by participants.