Effects of a Time-Varying Color-Luminosity Parameter β on the Cosmological Constraints of Modified Gravity Models
Effects of a Time-Varying Color-Luminosity Parameter β on the Cosmological Constraints of Modified Gravity Models
复制标题
时变颜色光度参数 β 对修正引力模型的宇宙学约束的影响
DOI:
10.1088/0253-6102/62/6/23
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发表时间:
2014-07
影响因子:
3.1
通讯作者:
张鑫
中科院分区:
文献类型:
--
作者:
王爽;王永贞;张鑫
It has been found that, for the Supernova Legacy Survey three-year (SNLS3) data, there is strong evidence for the redshift-evolution of color-luminosity parameter ?. In previous studies, only dark energy (DE) models are used to explore the effects of a time-varying ? on parameter estimation. In this paper, we extend the discussions to the case of modified gravity (MG), by considering Dvali?Gabadadze?Porrati (DGP) model, power-law type f(T) model and exponential type f(T) model. In addition to the SNLS3 data, we also use the latest Planck distance priors data, the galaxy clustering (GC) data extracted from Sloan Digital Sky Survey (SDSS) data release 7 (DR7) and Baryon Oscillation Spectroscopic Survey (BOSS), as well as the direct measurement of Hubble constant H0 from the Hubble Space Telescope (HST) observation. We find that, for both cases of using the supernova (SN) data alone and using the combination of all data, adding a parameter of ? can reduce ?2 by ~ 36 for all the MG models, showing that a constant ? is ruled out at 6? confidence level (CL). Moreover, we find that a time-varying ? always yields a larger fractional matter density ?m0 and a smaller reduced Hubble constant h; in addition, it significantly changes the shapes of 1? and 2? confidence regions of various MG models, and thus corrects systematic bias for the parameter estimation. These conclusions are consistent with the results of DE models, showing that ?'s evolution is completely independent of the cosmological models in the background. Therefore, our work highlights the importance of considering the evolution of ? in the cosmology-fits.
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影响因子:
6.5
作者:
J. Guy;M. Sullivan;A. Conley;A. Conley;N. Regnault;P. Astier;C. Balland;C. Balland;S. Basa;R. Carlberg;D. Fouchez;D. Hardin;I. Hook;I. Hook;D. Howell;D. Howell;R. Pain;N. Palanque-Delabrouille;K. Perrett;K. Perrett;C. Pritchet;J. Rich;V. Ruhlmann-Kleider;D. Balam;S. Baumont;R. Ellis;R. Ellis;S. Fabbro;S. Fabbro;H. Fakhouri;N. Fourmanoit;S. González-Gaitán;M. Graham;E. Hsiao;T. Kronborg;C. Lidman;A. Mourão;S. Perlmutter;P. Ripoche;P. Ripoche;N. Suzuki;E. Walker
通讯作者:
J. Guy;M. Sullivan;A. Conley;A. Conley;N. Regnault;P. Astier;C. Balland;C. Balland;S. Basa;R. Carlberg;D. Fouchez;D. Hardin;I. Hook;I. Hook;D. Howell;D. Howell;R. Pain;N. Palanque-Delabrouille;K. Perrett;K. Perrett;C. Pritchet;J. Rich;V. Ruhlmann-Kleider;D. Balam;S. Baumont;R. Ellis;R. Ellis;S. Fabbro;S. Fabbro;H. Fakhouri;N. Fourmanoit;S. González-Gaitán;M. Graham;E. Hsiao;T. Kronborg;C. Lidman;A. Mourão;S. Perlmutter;P. Ripoche;P. Ripoche;N. Suzuki;E. Walker
影响因子:
6.4
作者:
Li, Miao;Wang, Shuang;Zhang, Xin;Li, Xiao-Dong
通讯作者:
Li, Xiao-Dong
影响因子:
5
作者:
Hao Wei;R. Cai
通讯作者:
Hao Wei;R. Cai
影响因子:
4.4
作者:
Yun-He Li;Xin Zhang
通讯作者:
Xin Zhang
影响因子:
4.4
作者:
He, Jian-Hua;Abdalla, Elcio;Wang, Bin
通讯作者:
Wang, Bin