Test of the cosmic evolution using Gaussian processes
Much focus was on the possible slowing down of cosmic acceleration under the dark energy parametrization. In the present paper, we investigate this subject using the Gaussian processes (GP), without resorting to a particular template of dark energy. The reconstruction is carried out by abundant data...
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| Published in | Journal of cosmology and astroparticle physics Vol. 2016; no. 12; p. 5 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
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05.12.2016
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| Abstract | Much focus was on the possible slowing down of cosmic acceleration under the dark energy parametrization. In the present paper, we investigate this subject using the Gaussian processes (GP), without resorting to a particular template of dark energy. The reconstruction is carried out by abundant data including luminosity distance from Union2, Union2.1 compilation and gamma-ray burst, and dynamical Hubble parameter. It suggests that slowing down of cosmic acceleration cannot be presented within 95% C.L., in considering the influence of spatial curvature and Hubble constant. In order to reveal the reason of tension between our reconstruction and previous parametrization constraint for Union2 data, we compare them and find that slowing down of acceleration in some parametrization is only a ''mirage'. Although these parameterizations fits well with the observational data, their tension can be revealed by high order derivative of distance D. Instead, GP method is able to faithfully model the cosmic expansion history. |
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| AbstractList | Much focus was on the possible slowing down of cosmic acceleration under the dark energy parametrization. In the present paper, we investigate this subject using the Gaussian processes (GP), without resorting to a particular template of dark energy. The reconstruction is carried out by abundant data including luminosity distance from Union2, Union2.1 compilation and gamma-ray burst, and dynamical Hubble parameter. It suggests that slowing down of cosmic acceleration cannot be presented within 95% C.L., in considering the influence of spatial curvature and Hubble constant. In order to reveal the reason of tension between our reconstruction and previous parametrization constraint for Union2 data, we compare them and find that slowing down of acceleration in some parametrization is only a ''mirage'. Although these parameterizations fits well with the observational data, their tension can be revealed by high order derivative of distance D. Instead, GP method is able to faithfully model the cosmic expansion history. |
| Author | Zhang, Ming-Jian Xia, Jun-Qing |
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| BackLink | https://www.osti.gov/biblio/22679371$$D View this record in Osti.gov |
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| SubjectTerms | ACCELERATION ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPARATIVE EVALUATIONS COSMIC GAMMA BURSTS DISTANCE EXPANSION GALACTIC EVOLUTION GAMMA RADIATION GAUSSIAN PROCESSES LUMINOSITY NONLUMINOUS MATTER STAR EVOLUTION |
| Title | Test of the cosmic evolution using Gaussian processes |
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