Revisiting Metastable Dark Energy and Tensions in the Estimation of Cosmological Parameters
作者： Xiaolei Li , Arman Shafieloo , Varun Sahni , Alexei A. Starobinsky
关键词: Dark energy 、 Standard Model 、 Universe 、 Cosmic microwave background 、 Dark matter 、 Supernova 、 Physics 、 Astrophysics 、 Planck 、 Hubble's law
摘要: We investigate constraints on some key cosmological parameters by confronting metastable dark energy models with different combinations of the most recent observations. Along standard $\Lambda$CDM model, two phenomenological are considered: (\romannumeral1) DE decays exponentially, (\romannumeral2) into matter. find that: (1) when considering supernovae and BAO data, assuming a fiducial inconsistency in estimated value $\Omega_{\rm{m,0}}h^2$ parameter obtained either including or excluding Planck CMB data becomes very much substantial points to clear tension~\citep{sahni2014model,zhao2017dynamical}; (2) although that we study provide greater flexibility fitting they indeed fit SNe Ia+BAO substantially better than $\Lambda$CDM, not able alleviate this tension significantly included; (3) while local measurements Hubble constant higher relative $H_0$ our (obtained Ia data), situation seems be rather complicated hints among observational sets (CMB, measurements). Our results indicate might remove current tensions observations simple modifications model introducing minimal models. A form expansion history, systematics and/or non-conventional early Universe responsible for these tensions.
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