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arXiv · 1311.3467

A possible resolution of tension between {\it Planck} and Type Ia supernova observations

Zhengxiang Li·Puxun Wu·Hongwei Yu·Zong-Hong Zhu
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Abstract

There is an apparent tension between cosmological parameters obtained from {\it Planck} cosmic microwave background radiation observations and that derived from the observed magnitude-redshift relation for the type Ia supernova (SNe Ia). Here, we show that the tension can be alleviated, if we first calibrate, with the help of the distance-duality relation, the light-curve fitting parameters in the distance estimation in SNe Ia observations with the angular diameter distance data of the galaxy clusters and then re-estimate the distances for the SNe Ia with the corrected fitting parameters. This was used to explore their cosmological implications in the context of the spatially flat cosmology. We find a higher value for the matter density parameter, $Ω_m$, as compared to that from the original SNLS3, which is in agreement with {\it Planck} observations at $68.3\%$ confidence. Therefore, the tension between {\it Planck} measurements and SNe Ia observations regarding $Ω_m$ can be effectively alleviated without invoking new physics or resorting to extensions for the standard concordance model. Moreover, with the absolute magnitude of a fiducial SNe Ia, $M$, determined first, we obtained a constraint on the Hubble constant with SNLS3 alone, which is also consistent with {\it Planck}.

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Zhengxiang Li, Puxun Wu, Hongwei Yu, Zong-Hong Zhu. 2013-12-29. A possible resolution of tension between {\it Planck} and Type Ia supernova observations. https://arxiv.org/abs/1311.3467

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