A possible resolution of tension between Planck and Type Ia supernova observations  

作　　者：LI ZhengXiang WU PuXun YU HongWei ZHU ZongHong 

机构地区：[1]Department of Astronomy,Beijing Normal University [2]Center for Nonlinear Science and Department of Physics,Ningbo University [3]Department of Physics and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education,Hunan Normal University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第2期381-386,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Ministry of Science and Technology National Basic Science Program (973) (Grant No. 2012CB821804);the National Natural Science Foundation of China (Grant Nos. 10935013,11075083,11175093,11222545 and 11375092);Zhejiang Provincial Natural Science Foundation of China (Grant Nos. Z6100077 and R6110518);the FANEDD (Grant No. 200922);the Hunan Provincial Natural Science Foundation of China (Grant No. 11JJ7001);the SRFDP (Grant No. 20124306110001);partially supported by China Postdoc (Grant No. 2013M530541)

摘　　要：There is an apparent tension between cosmological parameters obtained from 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 fiat cosmology. We find a higher value for the matter density parameter, Ωm, as compared to that from the original SNLS3, which is in agreement with Planck observations at 68.3% confidence. Therefore, the tension between Planck measurements and SNe Ia observations regarding Ωm 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 Planck.There is an apparent tension between cosmological parameters obtained from 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,m,as compared to that from the original SNLS3,which is in agreement with Planck observations at 68.3%confidence.Therefore,the tension between Planck measurements and SNe Ia observations regarding m can be efectively 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 Planck.

关 键 词：X-rays： galaxies： clusters -（cosmology：） distance scale - cosmology： miscellaneous 

分 类 号：P12[天文地球—天体测量] P145.3[天文地球—天文学]