Affiliation:
1. Department of Physics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
2. Department of Astronomy, Tsinghua University , Beijing 100084, China
Abstract
ABSTRACT
We constrain the expansion history of the Universe and the cosmological matter density fraction in a model-independent way by exclusively making use of the relationship between background and perturbations under a minimal set of assumptions. We do so by employing a Gaussian process to model the expansion history of the Universe from present time to the recombination era. The expansion history and the cosmological matter density are then constrained using recent measurements from cosmic chronometers, Type-Ia supernovae, baryon acoustic oscillations, and redshift-space distortion data. Our results show that the evolution in the reconstructed expansion history is compatible with the Planck 2018 prediction at all redshifts. The current data considered in this study can constrain a Gaussian process on H(z) to an average $9.4 {{\ \rm per\ cent}}$ precision across redshift. We find Ωm = 0.224 ± 0.066, lower but statistically compatible with the Planck 2018 cosmology. Finally, the combination of future DESI measurements with the CMB measurement considered in this work holds the promise of $8 {{\ \rm per\ cent}}$ average constraints on a model-independent expansion history as well as a five-fold tighter Ωm constraint using the methodology developed in this work.
Funder
European Research Council
European Union
Horizon 2020
Science and Technology Facilities Council
ESA
NASA
Alfred P. Sloan Foundation
U.S. Department of Energy
Office of Science
University of Utah
Carnegie Mellon University
University of Tokyo
Lawrence Berkeley National Laboratory
New Mexico State University
New York University
University of Notre Dame
MCTI
Ohio State University
Pennsylvania State University
Universidad Nacional Autónoma de México
University of Arizona
University of Colorado Boulder
Oxford University
University of Portsmouth
University of Virginia
University of Washington
Vanderbilt University
Yale University
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
17 articles.
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