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DTSTART;TZID=Europe/Rome:20240618T140000
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DTSTAMP:20260411T125334
CREATED:20240614T125023Z
LAST-MODIFIED:20240614T125023Z
UID:37792-1718719200-1718724600@w3.lnf.infn.it
SUMMARY:Dark matter in QCD-like theories with a theta vacuum: cosmological and astrophysical implications
DESCRIPTION:Oscar Zapata (Universidad de Antioquia) \nQCD-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.
URL:https://w3.lnf.infn.it/event/dark-matter-in-qcd-like-theories-with-a-theta-vacuum-cosmological-and-astrophysical-implications/?lang=en
LOCATION:Aula Seminari\, Via Enrico Fermi\, 40\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari teorici
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