Two-fluid scenario in Bianchi type-I universe

G. K. Goswami, Meena Mishra, Anil Kumar Yadav, Anirudh Pradhan

2020Modern Physics Letters A32 citationsDOI Open Access PDF

Abstract

In this paper, we study a Bianchi type-I model of universe filled with barotropic and dark energy (DE) type fluids. The present values of cosmological parameters, such as Hubble constant [Formula: see text], DE and anisotropy energy parameters [Formula: see text], [Formula: see text] and [Formula: see text] and Equation of State (EoS) parameter for DE [Formula: see text], are statistically estimated in two ways by taking 38 point data set of Hubble parameter [Formula: see text] and 581 point data set of distance modulus of supernovae in the range [Formula: see text]. It is found that the results agree with the Planck result [Planck Collab. (P. A. R. Ade et al.), Astron. Astrophys. 594, A14 (2016)] and more latest result obtained by Amirhashchi and Amirhashchi [H. Amirhashchi and S. Amirhashchi, arXiv:1811.05400v4]. Various physical properties such as age of the universe, deceleration parameter, etc. have also been investigated.

Topics & Concepts

PhysicsHubble's lawDark energyDeceleration parameterBarotropic fluidPlanckMathematical physicsEquation of stateUniverseCosmologyTheoretical physicsCosmological constantType (biology)Age of the universeMetric expansion of spaceRange (aeronautics)Cosmological modelAnisotropyDe Sitter universeClassical mechanicsEnergy (signal processing)Point (geometry)SupernovaConstant (computer programming)Friedmann–Lemaître–Robertson–Walker metricEnergy densityAstrophysicsSet (abstract data type)Inflation (cosmology)State (computer science)Hubble volumeSimple (philosophy)Shape of the universeModuliCosmology and Gravitation TheoriesStatistical Mechanics and EntropyGalaxies: Formation, Evolution, Phenomena