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Metastable Dark Energy with Radioactive-like Decay
- Source :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, 2018, 473 (2), pp.2760-2770. ⟨10.1093/mnras/stx2481⟩, Mon.Not.Roy.Astron.Soc., Mon.Not.Roy.Astron.Soc., 2018, 473 (2), pp.2760-2770. ⟨10.1093/mnras/stx2481⟩, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2018, 473 (2), pp.2760-2770. ⟨10.1093/mnras/stx2481⟩
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- We propose a new class of metastable dark energy (DE) phenomenological models in which the DE decay rate does not depend on external parameters such as the scale factor or the curvature of the Universe. Instead, the DE decay rate is assumed to be a constant depending only on intrinsic properties of DE and the type of a decay channel, similar to case of the radioactive decay of unstable particles and nuclei. As a consequence, the DE energy density becomes a function of the proper time elapsed since its formation, presumably in the very early Universe. Such a natural type of DE decay can profoundly affect the expansion history of the Universe and its age. Metastable DE can decay in three distinct ways: (i) exponentially, (ii) into dark matter, (iii) into dark radiation. Testing metastable DE models with observational data we find that the decay half-life must be many times larger than the age of the Universe. Models in which dark energy decays into dark matter lead to lower values of the Hubble parameter at large redshifts relative to $\Lambda$CDM. Consequently these models provide a better fit to cosmological BAO data (especially data from from high redshift quasars) than concordance ($\Lambda$CDM) cosmology.<br />Comment: 12 pages, 8 figures, 2 tables, matches the final version published in MNRAS
- Subjects :
- cosmological model
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
quasar: redshift
Scalar field dark matter
FOS: Physical sciences
General Relativity and Quantum Cosmology (gr-qc)
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
General Relativity and Quantum Cosmology
dark matter
Thermodynamics of the universe
High Energy Physics - Phenomenology (hep-ph)
De Sitter universe
cosmology: theory
0103 physical sciences
energy: density
dark energy
010303 astronomy & astrophysics
Light dark matter
Physics
decay rate
Hubble constant
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
Hot dark matter
redshift: high
nucleus
Astronomy and Astrophysics
High Energy Physics - Phenomenology
dark energy: decay
Space and Planetary Science
Dark radiation
radioactivity
curvature
Dark energy
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Dark fluid
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711 and 13652966
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, 2018, 473 (2), pp.2760-2770. ⟨10.1093/mnras/stx2481⟩, Mon.Not.Roy.Astron.Soc., Mon.Not.Roy.Astron.Soc., 2018, 473 (2), pp.2760-2770. ⟨10.1093/mnras/stx2481⟩, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2018, 473 (2), pp.2760-2770. ⟨10.1093/mnras/stx2481⟩
- Accession number :
- edsair.doi.dedup.....b3a06e0ba564049660fab60ea14708d3