Baryogenesis in extended inflation. Part 1: Baryogenesis via production and decay of supermassive bosons

摘要

Baryogenesis occurring during the thermalization stage at the end of extended inflation is considered. In extended inflation, the Universe passes through a first-order phase transition via bubble nucleation; inflation comes to an end when bubbles collide and their collisions convert energy stored in the bubble walls into particles. This naturally provides conditions well out of thermal equilibrium in which baryon number violating processes may proceed; the amount of baryon asymmetry which may be produced this way is estimated. The avoidance of a monopole or domain wall problem can also be ensured and isothermal density perturbations may arise as a remnant of spatial variation in the baryon asymmetry.