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Searching for sterile neutrinos in dynamical dark energy cosmologies

Feng, Lu; Zhang, Jing-Fei; Zhang, Xin

We investigate how the dark energy properties change the cosmological limits on sterile neutrino parameters by using recent cosmological observations. We consider the simplest dynamical dark energy models, the wCDM model and the holographic dark energy (HDE) model, to make an analysis. The cosmological observations used in this work include the Pl…

Probing the sign-changeable interaction between dark energy and dark matter with current observations

Zhang, Jing-Fei; Zhang, Xin; Li, Yun-He +2 more

We consider the models of vacuum energy interacting with cold dark matter in this study, in which the coupling can change sigh during the cosmological evolution. We parameterize the running coupling b by the form b(a) = b₀a+b_e(1‑a), where at the early-time the coupling is given by a constant b_e and today the coupli…

Reconstruction of constant slow-roll inflation

Gao, Qing

Using the relations between the slow-roll parameters and the power spectra for the single field slow-roll inflation, we derive the scalar spectral tilt n _s and the tensor to scalar ratio r for the constant slow-roll inflation, and obtain the constraint on the slow-roll parameter η from the Planck 2015 results. The inflationary potenti…

Impact of the latest measurement of Hubble constant on constraining inflation models

Zhang, Xin

We investigate how the constraint results of inflation models are affected by considering the latest local measurement of $H_0$ in the global fit. We use the observational data, including the Planck CMB full data, the BICEP2 and Keck Array CMB B-mode data, the BAO data, and the latest measurement of Hubble constant, to constrain the $\Lambda$CDM+$…

Cosmological implications of different baryon acoustic oscillation data

Li, Miao; Wang, Shuang; Hu, YaZhou

In this work, we explore the cosmological implications of different baryon acoustic oscillation (BAO) data, including the BAO data extracted by using the spherically averaged one-dimensional galaxy clustering (GC) statistics (hereafter BAO1) and the BAO data obtained by using the anisotropic two-dimensional GC statistics (hereafter BAO2). To make …