Date: 14 de agosto – 14:30 hrs. (Chile Continental)

Lugar: Vía online

Speaker: Dr. Oscar Zapata Noreña (Universidad de Antioquía, Colombia)

 Title: “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.

Unirse a la reunión Zoom con nombre y apellido (with name and surname):    https://reuna.zoom.us/j/87161425888?pwd=MWFZUFNQRnI4MXo1QzFLdGpJblllZz09

ID de reunión: 871 6142 5888

Código de acceso: 100126

NOTE:  The seminars are uploaded in the youtube channel UTFSMHEP Seminars:   https://www.youtube.com/channel/UCYq1A4y7pCHqovaXsrtd6hg