Cosmology with low-redshift observations: No signal for new physics

Koushik Dutta, Anirban Roy, Ruchika, Anjan A. Sen, and M. M. Sheikh-Jabbari
Phys. Rev. D 100, 103501 – Published 1 November 2019

Abstract

We analyze 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=70.31.35+1.36Km/s/Mpc (at 1σ). This value is in 2σ 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 S8=σ8Ωm0/0.3 from our analysis is S8=0.760.03+0.03, fully consistent with direct measurement of S8 by KiDS+VIKING450+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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  • Received 29 August 2019

DOI:https://doi.org/10.1103/PhysRevD.100.103501

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Koushik Dutta1,*, Anirban Roy2,†, Ruchika3,‡, Anjan A. Sen3,§, and M. M. Sheikh-Jabbari4,5,∥

  • 1Theory Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Salt Lake, Kolkata-700064, India
  • 2SISSA, Via Bonomea 265, 34136 Trieste, Italy
  • 3Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi-110025, India
  • 4School of physics, Inst. for research in fundamental sciences (IPM), P.O.Box 19395-5531 Tehran, Iran
  • 5The Abdus Salam ICTP, Strada Costiera 11, 34151 Trieste, Italy

  • *koushik.physics@gmail.com
  • aroy@sissa.it
  • ruchika@ctp-jamia.res.in
  • §aasen@jmi.ac.in
  • jabbari@theory.ipm.ac.ir

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Issue

Vol. 100, Iss. 10 — 15 November 2019

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