Gravity in five-dimensional warped product spacetimes with time-dependent warp factor

7th International Conference on Gravitation and Cosmology

Guha, S.^1 ; Bhattacharya, P.^2

Department of Physics, St. Xavier's College (Autonomous), Kolkata 700016, India^1

Gopal Nagar High School, Singur 712409, W Bengal, India^2

关键词: Cosmological constants;    Energy condition;    Extra dimensions;    Field equation;    Geometric interpretation;    Scalar fields;    Time dependent;    Warped products;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/484/1/012015/pdf
DOI  :  10.1088/1742-6596/484/1/012015

来源: IOP

【 摘 要 】

We have considered gravity in a 5-dimensional warped product spacetime with a time-dependent warp factor and time-dependent extra dimension. The braneworld has been described by a spatially flat FRW-type metric. The five-dimensional field equations have been constructed and solved, and the status of the energy conditions have been examined. In the high energy regime, the bulk is assumed to be sourced by a scalar field. The effective cosmological constant of the 4-dimensional universe is a variable quantity monitored by the time-dependent warp factor, and leads to a geometric interpretation of dynamical dark energy.