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| 1 | Revisit of constraints on holographic dark energy:SNLS3 dataset with the effects of time-varying β and different light-curve fitters显示文摘Previous studies have shown that for the Supernova Legacy Survey three-year(SNLS3)data there is strong evidence for the redshiftevolution of color-luminosity parameterβof type Ia supernovae(SN Ia).In this paper,we explore the effects of varyingβon the cosmological constraints of holographic dark energy(HDE)model.In addition to the SNLS3 data,we also use Planck distance prior data of cosmic microwave background(CMB),as well as galaxy clustering(GC)data extracted from Sloan Digital Sky Survey(SDSS)data release 7 and Baryon Oscillation Spectroscopic Survey(BOSS).We find that,for the both cases of using SN data alone and using SN+CMB+GC data,involving an additional parameter ofβcan reduceχ2by~36;this shows thatβdeviates from a constant at 6σconfidence levels.Adopting SN+CMB+GC data,we find that compared to the constantβcase,varyingβyields a larger fractional matter density-m0and a smaller reduced Hubble constant h;moreover,varyingβsignificantly increases the value of HDE model parameter c,leading to c≈0.8,consistent with the constraint results obtained before Planck.These results indicate that the evolution ofβshould be taken into account seriously in the cosmological fits.In addition,we find that relative to the differences between the constantβand varyingβ(z)cases,the effects of different light-curve fitters on parameter estimation are very small. | WANG Shuang GENG JiaJia HU YiLiang ZHANG Xin | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，1： | 2 |
| 2 | Redshift drift constraints on f(T) gravity显示文摘我们为 f (T) 严肃理论在宇宙论的限制的精确上探索 SandageLoeb (SL ) 测试的影响。因为它在远类星体的系列在 Lyman- 森林里测量 redshift 飘移, SL 测试是对当前的宇宙论的观察的重要补充,盖住 2 z 的 redshift 沙漠 5。避免数据矛盾,当模仿 30 的基准的模型嘲笑 SL 测试数据,我们基于当前的联合观察数据使用最好合适的模型。我们确定为 f (T) 严肃理论的参数评价上的这些 SL 测试数据的影响。二个典型 f (T) 模型被考虑,幂定律模型 f (T) PL 和指数形式的模型 f (T) 终止 。结果证明 SL 测试罐头有效地打破存在在在另外的宇宙论的观察的今日的事密度 m 和小瘤常数 H 0 之间的强壮的退化。为考虑 f (T) 模型, SL 测试的 30 年的观察能极其改进 m 和 H 0 的限制精确,但是不能有效地改进模型参数的限制精确。 | Jia-Jia Geng Rui-Yun Guo Dong-Ze He Jing-Fei Zhang Xin Zhang | 2015 | Frontiers of physics2015，10，5： | 0 |
| 3 | Strong gravitational lensing constraints on holographic dark energy显示文摘Strong gravitational lensing(SGL) has provided an important tool for probing galaxies and cosmology. In this paper, we use the SGL data to constrain the holographic dark energy model, as well as models that have the same parameter number, such as the w CDM and Ricci dark energy models. We find that only using SGL is difficult to effectively constrain the model parameters.However, when the SGL data are combined with CBS(CMB+BAO+SN) data, the reasonable estimations can be given and the constraint precision is improved to a certain extent, relative to the case of CBS only. Therefore, SGL is an useful way to tighten constraints on model parameters. | CUI JingLei XU YueYao ZHANG JingFei ZHANG Xin | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，11： | 0 |
| 4 | Constraints on neutrino mass in the scenario of vacuum energy interacting with cold dark matter after Planck 2018显示文摘In this work,we investigate the constraints on the total neutrino mass in the scenario of vacuum energy interacting with cold dark matter(abbreviated as IACDM)by using the latest cosmological observations.We consider four typical interaction forms,i.e.Q=βHρde,Q=βHρc,Q=βH0ρde,and Q=βH0ρc,in the IACDM scenario.To avoid the large-scale instability problem in interacting dark energy models,we employ the extended parameterized post-Friedmann method for interacting dark energy to calculate the perturbation evolution of dark energy in these models.The observational data used in this work include the cosmic microwave background(CMB)measurements from the Planck 2018 data release,the baryon acoustic oscillation(BAO)data,the type Ia supernovae(SN)observation(Pantheon compilation),and the 2019 local distance ladder measurement of the Hubble constant H0 from the Hubble Space Telescope.We find that,compared with those in the ACDM+∑mv model,the constrains on∑mv are looser in the four IACDM+∑mv models.When considering the three mass hierarchies of neutrinos,the constraints on∑mv are tightest in the degenerate hierarchy case and loosest in the inverted hierarchy case.In addition,in the four IACDM+∑mv models,the values of coupling parameterβare larger using the CMB+BAO+SN+H0 data combination than that using the CMB+BAO+SN data combination,andβ>0 is favored at more than 1σlevel when using CMB+BAO+SN+H0 data combination.The issue of the H0 tension is also discussed in this paper.We find that,compared with the ACDM+∑mv model,the H0 tension can be alleviated in the IACDM+∑mv model to some extent. | Hai-Li Li Jing-Fei Zhang Xin Zhang | 2020 | Communications in Theoretical Physics2020，72，12： | 0 |
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