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Impact of the latest measurement of Hubble constant on constraining inflation models 被引量:1

Impact of the latest measurement of Hubble constant on constraining inflation models
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摘要 Recently,Riess et al.[1]reported the new result of local measurement of the Hubble constant,H_0=(73.00±1.75)km s^(-1) Mpc^(-1),which is 3.3σhigher than the fit result of ocal measurement of the Hubble constant, H_0 = (73.00 ± 1.75) km s^(-1) Mpc^(-1), which is 3.3σ higher than the fit result of (66.93±0.62) km s^(-1) Mpc^(-1) derived by the Planck collaboration based on theΛCDM model withmν=0.06 e V using the latest Planck CMB data.The tension between the latest H0measurement and the Planck data has inspired numerous discussions.On one hand,it might be caused by some systematic uncertainties in the measurements.On the other hand,perhaps one has omitted some unknown physical factors in the cosmological model,which leads to some inconsistencies among different data sets.For example,replacing the cosmological constant with a dynamical dark energy[2]and considering the extra relativistic degrees of freedom(i.e.,an additional parameter Neff)[1,3,4]both can help relieve this tension to some extent.It was also shown in ref.[4]that the involvement of light sterile neutrinos in the cosmological model can simultaneously relieve almost all the tensions among the current astrophysical observations,which leads to a new cosmic concordance. Recently,Riess et al.[1]reported the new result of local measurement of the Hubble constant,H0=(73.00±1.75)km s^-1 Mpc^-1,which is 3.3σhigher than the fit result of ocal measurement of the Hubble constant, H0 = (73.00 ± 1.75) km s^-1 Mpc^-1, which is 3.3σ higher than the fit result of (66.93±0.62) km s^-1 Mpc^-1 derived by the Planck collaboration based on theΛCDM model withmν=0.06 e V using the latest Planck CMB data.The tension between the latest H0measurement and the Planck data has inspired numerous discussions.On one hand,it might be caused by some systematic uncertainties in the measurements.On the other hand,perhaps one has omitted some unknown physical factors in the cosmological model,which leads to some inconsistencies among different data sets.For example,replacing the cosmological constant with a dynamical dark energy[2]and considering the extra relativistic degrees of freedom(i.e.,an additional parameter Neff)[1,3,4]both can help relieve this tension to some extent.It was also shown in ref.[4]that the involvement of light sterile neutrinos in the cosmological model can simultaneously relieve almost all the tensions among the current astrophysical observations,which leads to a new cosmic concordance.
作者 Xin Zhang
出处 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第6期78-79,共2页 中国科学:物理学、力学、天文学(英文版)
基金 supported by the National Natural Science Foundation of China (Grant Nos. 11522540, and 11690021) the Top-Notch Young Talents Program of China, and the Provincial Department of Education of Liaoning (Grant No. L2012087)
关键词 inflation relativistic Planck sterile freedom relieve dynamical numerous collaboration perhaps 测量系统 哈勃常数 膨胀模型 宇宙学模型 天体物理观测 宇宙学常数 MPC 普朗克
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