A coupled vacuum energy model producing endless alternated phases of accelerated and decelerated expansion
| Autor: | Stéphane Fay |
|---|---|
| Přispěvatelé: | Palais de la Découverte |
| Rok vydání: | 2015 |
| Předmět: |
cosmological model
Initial singularity media_common.quotation_subject Dark matter energy: coupling FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences General Relativity and Quantum Cosmology dark matter [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] Theoretical physics Vacuum energy De Sitter universe 0103 physical sciences inflation 010306 general physics 010303 astronomy & astrophysics media_common Inflation (cosmology) Physics nucleosynthesis Shape of the universe singularity Universe Classical mechanics [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] cosmic coincidence Inflationary epoch history expansion: acceleration expansion: deceleration |
| Zdroj: | Physical Review D Physical Review D, American Physical Society, 2017, 95 (8), pp.083504. ⟨10.1103/PhysRevD.95.083504⟩ Phys.Rev.D Phys.Rev.D, 2017, 95 (8), pp.083504. ⟨10.1103/PhysRevD.95.083504⟩ Phys.Rev.D, 2017, 95 (8), pp.083504. 〈10.1103/PhysRevD.95.083504〉 |
| ISSN: | 1550-7998 1550-2368 |
| DOI: | 10.48550/arxiv.1511.02624 |
| Popis: | We consider a flat Universe filled with a vacuum energy coupled to matter and radiation by respectively positive coupling functions $Q_m$ and $Q_r$. We require that these functions be such as Universe exits from inflation to go to a radiation dominated epoch and allow to reproduce the observed $\Lambda CDM$ expansion after this last epoch. These requirements lead to some necessary constraints on the coupling functions. We then look at one of the simplest forms of $Q_m$ and $Q_r$ able to satisfy them. The cosmological model thus defined describes a Universe with an initial singularity and endless alternated periods of accelerated and decelerated expansion (one of them being our $\Lambda CDM$ Universe) unifying inflation and present time expansion acceleration. Comment: 18 pages, 10 figure |
| Databáze: | OpenAIRE |
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