Entropic force, running gravitational coupling and future singularities
| Autor: | Maryam Aghaei Abchouyeh, Zeinab Sherkatghanad, Behrouz Mirza |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) FOS: Physical sciences Function (mathematics) General Relativity and Quantum Cosmology (gr-qc) Type (model theory) Coupling (probability) General Relativity and Quantum Cosmology Gravitation Singularity Gravitational singularity Quantum Entropic force Mathematical physics |
| Popis: | The effects of a running gravitational coupling and the entropic force on future singularities are considered. Although it is expected that the quantum corrections remove the future singularities or change the singularity type, treating the running gravitational coupling as a function of energy density is found to cause no change in the type of singularity but causes a delay in the time that a singularity occurs. The entropic force is found to replaces the singularity type $II$ by $\bar{III}$ ($a=$const., $H=$const., $\dot{H} \to \infty$, $p \to \infty$, $\rho \to \infty$) which differs from previously known type $III$ and to remove the $w$-singularity. We also consider an effective cosmological model and show that the types $I$ and $II$ are replaced by the singularity type $III$. Comment: 7 pages, 5 figures, references added |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|