Conveners
Reheating and Baryongenesis
- Antonio Masiero (DFA UniPD)
Cosmological phase transitions can give rise to intriguing phenomena, such as baryogenesis and stochastic gravitational wave backgrounds, due to nucleation and percolation of vacuum bubbles in the primordial plasma. A key parameter for predicting the amount of these relics is the bubble wall velocity, whose computation relies on solving the Boltzmann equations of the various species in the...
A dynamical mechanism, based on a confining non-Abelian dark symmetry, which generates Majorana masses for hyperchargeless fermions, is proposed. We apply it to the inverse seesaw scenario, which allows us to generate light neutrino masses from the interplay of TeV-scale pseudo-Dirac mass terms and a small explicit breaking of lepton number. A single generation of vectorlike dark quarks,...
In this talk I will consider models connecting baryogenesis with first order phase transition. In particular, I will elaborate on scenarios where the required amount of CP-violation originates from the production of heavy particles after true vacuum particles collide. I will focus on the case when both heavy particles are produced on-shell as well as the opposite regime when one of the heavy...
We propose a novel mechanism for Electroweak Baryogenesis (EWBG) within the real singlet extension of the Standard Model with an approximate ℤ2 symmetry. Domain walls associated with the spontaneous breaking of the ℤ2 symmetry feature restored (or weakly broken) EW symmetry in their core. In combination with a CP-violating source, the walls sweeping through space generate the baryon asymmetry...
We present the most recent $BABAR$ searches for reactions that could simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic $B$-meson decays of the kind $B\to\psi_{D} {\cal B}$, where $\cal{B}$ is an ordinary matter baryon (proton, $\Lambda$, or $\Lambda_c$) and $\psi_D$ is a dark-sector anti-baryon, with branching...
