Cosmology with bulk viscosity and the gravitino problem
Abstract The gravitino problem is revisited in the framework of cosmological models in which the primordial cosmic matter is described by a relativistic imperfect fluid. Dissipative effects (or bulk viscosity effects) arise owing to the different cooling rates of the fluid components. We show that t...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-4840-7 |
| _version_ | 1819238685330112512 |
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| author | L. Buoninfante G. Lambiase |
| author_facet | L. Buoninfante G. Lambiase |
| author_sort | L. Buoninfante |
| collection | DOAJ |
| description | Abstract The gravitino problem is revisited in the framework of cosmological models in which the primordial cosmic matter is described by a relativistic imperfect fluid. Dissipative effects (or bulk viscosity effects) arise owing to the different cooling rates of the fluid components. We show that the effects of the bulk viscosity allow one to avoid the late abundance of gravitinos. In particular, for particular values of the parameters characterizing the cosmological model, the gravitino abundance turns out to be weakly depending on the reheating temperature. |
| first_indexed | 2024-12-23T13:40:09Z |
| format | Article |
| id | doaj.art-d5d2bc34a89540209598155612c28bf2 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-23T13:40:09Z |
| publishDate | 2017-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-d5d2bc34a89540209598155612c28bf22022-12-21T17:44:54ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522017-05-017751710.1140/epjc/s10052-017-4840-7Cosmology with bulk viscosity and the gravitino problemL. Buoninfante0G. Lambiase1Dipartimento di Fisica “E.R. Caianiello” Universitá di SalernoDipartimento di Fisica “E.R. Caianiello” Universitá di SalernoAbstract The gravitino problem is revisited in the framework of cosmological models in which the primordial cosmic matter is described by a relativistic imperfect fluid. Dissipative effects (or bulk viscosity effects) arise owing to the different cooling rates of the fluid components. We show that the effects of the bulk viscosity allow one to avoid the late abundance of gravitinos. In particular, for particular values of the parameters characterizing the cosmological model, the gravitino abundance turns out to be weakly depending on the reheating temperature.http://link.springer.com/article/10.1140/epjc/s10052-017-4840-7Boltzmann EquationCosmological ModelHubble ParameterBulk ViscosityStandard Cosmological Model |
| spellingShingle | L. Buoninfante G. Lambiase Cosmology with bulk viscosity and the gravitino problem European Physical Journal C: Particles and Fields Boltzmann Equation Cosmological Model Hubble Parameter Bulk Viscosity Standard Cosmological Model |
| title | Cosmology with bulk viscosity and the gravitino problem |
| title_full | Cosmology with bulk viscosity and the gravitino problem |
| title_fullStr | Cosmology with bulk viscosity and the gravitino problem |
| title_full_unstemmed | Cosmology with bulk viscosity and the gravitino problem |
| title_short | Cosmology with bulk viscosity and the gravitino problem |
| title_sort | cosmology with bulk viscosity and the gravitino problem |
| topic | Boltzmann Equation Cosmological Model Hubble Parameter Bulk Viscosity Standard Cosmological Model |
| url | http://link.springer.com/article/10.1140/epjc/s10052-017-4840-7 |
| work_keys_str_mv | AT lbuoninfante cosmologywithbulkviscosityandthegravitinoproblem AT glambiase cosmologywithbulkviscosityandthegravitinoproblem |