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IPM
30
YEARS OLD

“School of Physic”

Paper   IPM / Physic / 15809
   School of Physics
  Title: Cosmology With Low-Redshift Observations: No Signal For New Physics
  Author(s):
1 . K. Dutta
2 . A. Roy
3 . . Ruchika
4 . A. A Sen
5 . M.M. Sheikh-Jabbari
  Status: Published
  Journal: Phys. Rev. D
  No.: 10
  Vol.: 100
  Year: 2019
  Pages: 103501
  Supported by: IPM
  Abstract:
We analyse various low-redshift cosmological data from Type-Ia Supernova, Baryon Acoustic Oscillations, Time-Delay measurements using Strong-Lensing, H(z) measurements using Cosmic Chronometers and growth measurements from large scale structure observations for ΛCDM and some different dark energy models. By calculating the Bayesian Evidence for different dark energy models, we find out that the ΛCDM still gives the best fit to the data with H0=70.3+1.36−1.35 Km/s/Mpc (at 1σ). This value is in 2σ or less tension with various low and high redshift measurements for H0 including SH0ES, Planck-2018 and the recent results from H0LiCOW-XIII. The derived constraint on S88√{Ωm0/0.3} from our analysis is S8 = 0.76+0.03−0.03, fully consistent with direct measurement of S8 by KiDS+VIKING-450+DES1 survey. We hence conclude that the ΛCDM model with parameter constraints obtained in this work is consistent with different early and late Universe observations within 2σ. We therefore, do not find any compelling reason to go beyond concordance ΛCDM model.

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