Physical condition for the slowing down of cosmic acceleration
| Autor: | Jun-Qing Xia, Ming-Jian Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics COSMIC cancer database Cosmology and Nongalactic Astrophysics (astro-ph.CO) Deceleration parameter 010308 nuclear & particles physics FOS: Physical sciences Acceleration (differential geometry) Astrophysics 01 natural sciences Measure (mathematics) Constraint (information theory) Theoretical physics symbols.namesake Supernova 0103 physical sciences Dark energy symbols lcsh:QC770-798 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010303 astronomy & astrophysics Gaussian process Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Nuclear Physics B, Vol 929, Iss, Pp 438-451 (2018) Nuclear Physics |
| ISSN: | 0550-3213 |
| Popis: | The possible slowing down of cosmic acceleration was widely studied. However, the imposition of dark energy parametrization brought some tensions. In our recent paper, we test this possibility using a model-independent method, Gaussian processes. However, the reason of generating these tensions is still closed. In the present paper, we analyse the derivative of deceleration parameter to solve the problems. The reconstruction of the derivative again suggests that no slowing down of acceleration is presented within 95\% C.L. from current observational data. We then deduce its constraint on dark energy. The corresponding constraint clearly reveals the reason of tension between different models in previous work. We also study the essential reason of why current data cannot convincingly measure the slowing down of acceleration. The constraints indicate that most of current data are not in the allowed region. 6 pages, 7 figures |
| Databáze: | OpenAIRE |
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