http://arxiv.org/abs/2209.14639
The study of cosmic expansion history and the late time cosmic acceleration from observational data depends on the nuisance parameters associated with the data. For example, the absolute peak magnitude of type Ia supernova associated with the type Ia supernova observations and the comoving sound horizon at the baryon drag epoch associated with baryon acoustic oscillation observations are two nuisance parameters. The nuisance parameters associated with the quasar and the gamma-ray bursts data are also considered. These nuisance parameters are constrained by combining the cosmological observations using the Gaussian process regression method without assuming any cosmological model or parametrization to the background cosmic expansion. The bounds obtained in this method can be used as the prior for the data analysis while considering the observational data accordingly. Interestingly, these bounds are independent of the present value of the Hubble parameter. Along with these nuisance parameters, the cosmic curvature density parameter is also constrained simultaneously and the constraints show no significant deviation from a flat Universe.
B. Dinda
Fri, 30 Sep 22
32/71
Comments: 8 pages, 3 figures, 3 tables; comments are welcome
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