$\Lambda$CDM-like models with future singularities
| Autor: | L. N. Granda |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
010308 nuclear & particles physics Equation of state (cosmology) General Physics and Astronomy Big Rip Astrophysics::Cosmology and Extragalactic Astrophysics Cosmological constant 01 natural sciences General Relativity and Quantum Cosmology Theoretical physics Singularity 0103 physical sciences Dark energy Gravitational singularity 010303 astronomy & astrophysics Scalar field Astrophysics - Cosmology and Nongalactic Astrophysics Quintessence |
| Zdroj: | The European Physical Journal Plus. 134 |
| ISSN: | 2190-5444 |
| Popis: | We consider new models of dark energy with finite time future singularities, by introducing the pressure density as a function of the scale factor. This approach gives acceptable phenomenological models of dark energy, practically indistinguishable from the cosmological constant up to the present, which face future singularities at finite time and finite scale factor. Exact scalar field model representation was found for quintessence, Big Rip and type III singularity models. The simple form of the equation of state allows to establish a relationship between its current value, $w_0$, and the time or redshift at which the singularity takes place. The effect on the growth of matter perturbations was calculated. Comment: 32 pages, 6 figures, to appear in EPJP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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