High Energy Physics Seminars next week (Zapata Norena)

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*


*Tuesday, 25 June* 2024, at *16:00* - *Luigi Stasi Seminar Room **- 
*https://indico.ictp.it/event/10735/
**

**

Oscar Alberto Zapata Norena (Universidad de Antioquia)

*“Dark Matter in QCD-like Theories with a Theta Vacuum: Cosmological and 
Astrophysical Implications"*


_Abstract_

QCD-like theories in which the dark matter (DM) of the Universe is 
hypothesized to be a thermal relic in the form of a dark pion has been 
extensively investigated, with most studies neglecting the CP-violating 
θ-angle associated with the topological vacuum. We point out that a 
non-vanishing θ could potentially trigger resonant number-changing 
processes giving rise to the observed relic density in agreement with 
perturbative unitarity as well as observations of clusters of galaxies. 
This constitutes a novel production mechanism of MeV DM and an 
alternative to those relying on the Wess-Zumino-Witten term. Moreover, 
for specific meson mass spectra, similar resonant scatterings serve as a 
realization of velocity-dependent self-interacting DM without a light 
mediator. Explicit benchmark models are presented together with a 
discussion of possible signals.


*To join via Zoom*:

https://zoom.us/j/98585067792

Meeting ID: 985 8506 7792

Passcode: 576817