The Djorgovski-Gurzadyan dark energy integral equation and the Hubble diagram
| Autor: | H. G. Khachatryan, A. Stepanian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Cold dark matter Cosmology and Nongalactic Astrophysics (astro-ph.CO) Differential equation Computer Science::Information Retrieval Horizon FOS: Physical sciences Astronomy and Astrophysics Astrophysics General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Integral equation General Relativity and Quantum Cosmology symbols.namesake Vacuum energy Space and Planetary Science 0103 physical sciences Dark energy symbols 010306 general physics 010303 astronomy & astrophysics Luminosity distance Hubble's law Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | We consider the observational aspects of the value of dark energy density from quantum vacuum fluctuations based initially on the Gurzadyan-Xue model. We reduce the Djorgovski-Gurzadyan integral equation to a differential equation for the co-moving horizon and then, by means of the obtained explicit form for the luminosity distance, we construct the Hubble diagram for two classes of observational samples. For supernova and gamma-ray burst data we show that this approach provides viable predictions for distances up to $z \simeq 9$, quantitatively at least as good as those provided by the lambda cold dark matter ($\Lambda$CDM) model. The Hubble parameter dependence $H(z)$ of the two models also reveals mutual crossing at $z=0.4018$, the interpretation of which is less evident. Comment: A&A Lett. (in press), 4 pages, 5 figures |
| Databáze: | OpenAIRE |
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