Kinetic and chemical equilibrium of the Universe and gravitino production
| Autor: | Anjishnu Sarkar, Raghavan Rangarajan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Inflation (cosmology)
Physics Particle physics Gauge boson Cosmology and Nongalactic Astrophysics (astro-ph.CO) High Energy Physics::Phenomenology FOS: Physical sciences Astronomy and Astrophysics Context (language use) General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Distribution function High Energy Physics - Phenomenology (hep-ph) De Sitter universe Phase space Gravitino High Energy Physics::Experiment Vacuum expectation value Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | Flat directions in generic supersymmetric theories can change the thermal history of the Universe. A novel scenario was proposed earlier where the vacuum expectation value of the flat directions induces large masses for all the gauge bosons and gauginos. This delays the thermalization of the Universe after inflation and solves the gravitino problem. In this article we perform a detailed calculation of the above scenario. We include the appropriate initial state particle distribution functions, consider the conditions for the feasibility of the non-thermal scenario, and investigate phase space suppression of gravitino production in the context of heavy gauge bosons and gauginos in the final state. We find that the total gravitino abundance generated is consistent with cosmological constraints. 40 pages, 10 figures, published version with several changes including in conclusion |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|