Transient dark energy, cosmological constant boundary crossing and dark energy w(z) data fits
| Autor: | Dalibor Perković, Hrvoje Štefančić |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) FOS: Physical sciences Boundary crossing Dark energy cosmological constant boundary crossing transient dark energy equation-of-state Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) Cosmological constant Astrophysics::Cosmology and Extragalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Formalism (philosophy of mathematics) High Energy Physics - Phenomenology (hep-ph) Space and Planetary Science Quantum electrodynamics Speed of sound Specific model Mathematical Physics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | The formalism of dark energy based on modeling speed of sound as a function of equation of state parameter is elaborated. A specific model which allows detailed study of cosmological constant boundary crossing is introduced and analytical solutions for the model dynamics are obtained. It is shown how in specific parameter regimes dark energy can be a transient phenomenon. It is further demonstrated how the model reproduces specific features of recent fits of dark energy $w(z)$ to observational data. v1: 17 pages, 5 figures. v2: discussion expanded, references added, typos corrected. v3: discussion expanded, a figure added |
| Databáze: | OpenAIRE |
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