The unified history of the viscous accelerating universe and phase transitions

Abstract

We propose the unified description of the early acceleration (cosmological inflation) and the present epoch of so called "dark energy". The inflation can be described by cosmic fluid with van der Waals equation of state and with viscosity term. Viscosity leads to slow-roll inflation with the parameters such as the spectral index, and the tensor-to-scalar ratio in concordance with observational data. Our next step is to modify this equation of state (EoS) to describe the present accelerated expansion. One can add the term into EoS so that the contribution of which is small for inflation but crucial for late-time acceleration. The key point of the model is possible phase transition which leads to decrease of the viscosity. We show that proposed model describes observational data about standard "candles" and correct dependence of Hubble parameter from redshift. Moreover, we propose the possible scenario to resolve dark matter problem.

14 pp., 7 figs., to appear in Nucl. Phys. B

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Cited by in corpus (7)

• Constraining viscous dark energy equation of state in $f(R,L_m)$ gravity
• Phase-space analysis of the viscous fluid cosmological models in the coincident $f(Q)$ gravity
• Cosmic acceleration with bulk viscosity in an anisotropic $f(R,L_m)$ background
• Bulk viscous cosmological model in $f(T,\mathcal{T})$ modified gravity
• Viscous fluid cosmology in symmetric teleparallel gravity
• Cosmological constraints in symmetric teleparallel gravity with bulk viscosity
• Multiple fluid theory of cosmic evolution and its thermodynamic analysis