Lambda-CDM universe: A phenomenological approach with many possibilities

摘要

A time-dependent phenomenological model of Lambda, viz. Lambda similar to H-3, is selected to investigate the Lambda-CDM cosmology. The time-dependent form of the equation-of-state parameter omega is derived and it has been possible to obtain the sought-for flip of sign of the deceleration parameter q. The present age of the Universe, calculated for some specific values of the parameters, agrees very well with the observational data.