Kinetic and chemical equilibrium of the Universe and gravitino production

摘要: Abstract Flat directions in generic supersymmetric theories can change the thermal history of Universe. A novel scenario was proposed earlier where vacuum expectation value flat induces large masses for all gauge bosons and gauginos. This delays thermalization Universe after inflation solves gravitino problem. In this article we perform a detailed calculation above scenario. We include appropriate initial state particle distribution functions, consider conditions feasibility non-thermal scenario, investigate phase space suppression production context heavy gauginos final state. find that total abundance generated is consistent with cosmological constraints.