Cosmological Parameter Estimation from SN Ia data: a Model-Independent Approach

Abstract

We perform a model independent reconstruction of the cosmic expansion rate based on type Ia supernova data. Using the Union 2.1 data set, we show that the Hubble parameter behaviour allowed by the data without making any hypothesis about cosmological model or underlying gravity theory is consistent with a flat LCDM universe having H_0 = 70.43 +- 0.33 and Omega_m=0.297 +- 0.020, weakly dependent on the choice of initial scatter matrix. This is in closer agreement with the recently released Planck results (H_0 = 67.3 +- 1.2, Omega_m = 0.314 +- 0.020) than other standard analyses based on type Ia supernova data. We argue this might be an indication that, in order to tackle subtle deviations from the standard cosmological model present in type Ia supernova data, it is mandatory to go beyond parametrized approaches.

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Cited by in corpus (12)

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• A metric space for type Ia supernova spectra
• Generalised model-independent characterisation of strong gravitational lenses V: reconstructing the lensing distance ratio by supernovae for a general Friedmann universe
• Constraints on the physical properties of Type Ia supernovae from photometry
• Absolute Distances to Nearby Type Ia Supernovae via Light Curve Fitting Methods
• Probing the Expansion history of the Universe by Model-Independent Reconstruction from Supernovae and Gamma-Ray Bursts Measurements
• A new analytical solution for the distance modulus in flat cosmology
• Fisher matrix for multiple tracers: all you can learn from large-scale structure without assuming a model
• Cosmological parameter constraints using phenomenological symbolic expressions: On the significance of symbolic expression complexity and accuracy
• On the sensitivity of weak gravitational lensing to the cosmic expansion function