Cosmographic analysis of a closed bouncing universe with the varying cosmological constant in <i>f</i>(<i>R</i>, <i>T</i>) gravity
Vinod Kumar Bhardwaj, Anirudh Pradhan, Nasr Ahmed, A. A. Shaker
Abstract
Modelling of matter bounce in f( R, T) gravity has been presented with no violation of the null energy condition. Only a closed universe with negative pressure is allowed in good agreement with some recent observations that favour a universe with positive curvature. Our results agree with some recent works in which a combination of positive curvature and vacuum energy leads to non-singular bounces with no violation of the null energy condition. The stability of the model has been discussed. The cosmographic parameters are developed for the derived model to explain the accelerated expansion of the universe.
Topics & Concepts
PhysicsCosmological constantEnergy conditionUniverseMetric expansion of spaceZero-energy universeCurvatureNull (SQL)Dark energyTheoretical physicsDe Sitter universeVacuum energyMathematical physicsClassical mechanicsCosmologyAstrophysicsGeneral relativityGeometryMathematicsComputer scienceDatabaseCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsGeophysics and Gravity Measurements