Left-Right Symmetry

An introduction about strong CP problem and its solutions. Readers are assumed to have basic knowledge of quantum field theory, but not more.

Electroweak (-like) phase transition is expected to happen in the early universe, given the well-known spontaneous gauge symmetry breaking. This phase transition, if of first order, can provide the necessary out-of-equilbrium condition for baryogenesis. Such a phase transition can happen for the SM electroweak symmetry breaking, or any other similar symmetry breaking in BSM gauge group extensions. This project investigates possibilities to achieve electroweak (-like) baryogenesis in different models.

A type of models that can solve the strong CP problem, with large potential to explain the origin of matter-antimatter asymmetry and provide dark matter candidate.

Space-time parity has been proposed as a solution to the strong CP problem for decades. However, electroweak (-like) baryogenesis from the $SU(2)_R \times U(1)_X \to U(1)_Y$ phase transition has been regarded as difficult. This paper investigates the possibility to realize the electroweak (-like) phase transition in such a phase transition, and discuss the resulting cosmological results.

Axion rotation has been recently proposed to be a possible source of baryogenesis, i.e. ‘axiogenesis’. This mechanism, however, cannot account for the observed number of axion dark matter abundance and baryon asymmetry simultaneously in minimal SM + axion. In this paper, we propose a possibility where axiogenesis can be compatible with axion dark matter.