Model-independent cosmological constraints from growth and expansion

Abstract

Reconstructing the expansion history of the Universe from type Ia supernovae data, we fit the growth rate measurements and put model-independent constraints on some key cosmological parameters, namely, ${\Omega }_{\mathrm{m}},\gamma$, and ${\sigma }_8$. The constraints are consistent with those from the concordance model within the framework of general relativity, but the current quality of the data is not sufficient to rule out modified gravity models. Adding the condition that dark energy density should be positive at all redshifts, independently of its equation of state, further constrains the parameters and interestingly supports the concordance model.

Accepted for publication in MNRAS; 7pages, 8 figures

References in corpus (12)

• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Two new diagnostics of dark energy
• The Clustering of the SDSS Main Galaxy Sample II: Mock galaxy catalogues and a measurement of the growth of structure from Redshift Space Distortions at $z=0.15$
• Model independent evidence for dark energy evolution from Baryon Acoustic Oscillations
• Testing LCDM with the Growth Function δ(a): Current Constraints
• Current constraints on the cosmic growth history
• Dynamical vacuum energy in the expanding Universe confronted with observations: a dedicated study
• Model Independent Reconstruction of the Expansion History of the Universe and the Properties of Dark Energy
• 2MTF VI. Measuring the velocity power spectrum
• Dynamical dark energy: scalar fields and running vacuum
• Banana Split: Testing the Dark Energy Consistency with Geometry and Growth
• Cosmic Growth and Expansion Conjoined

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