Acceleration in Weyl geometry

NEB 15 – Recent Developments in Gravity

Miritzis, J.^1

Department of Marine Sciences, University of the Aegean, University Hill, Mytilene 81100, Greece^1

关键词: Accelerated expansion of the universe;    Asymptotic behaviors;    Einstein equations;    Field equation;    Homogeneous and isotropic;    Scalar fields;    Spacetime;    Two-fluid;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/453/1/012006/pdf
DOI  :  10.1088/1742-6596/453/1/012006

来源: IOP

【 摘 要 】

We study homogeneous and isotropic cosmologies in a Weyl spacetime. We show that the field equations can be reduced to the Einstein equations with a two-fluid source and analyze the qualitative, asymptotic behavior of the models. Assuming an interaction of the two fluids we impose conditions so that the solutions of the corresponding dynamical system remain in the physically acceptable phase space. We show that in Weyl integrable spacetime, the corresponding scalar field acts as a phantom field and therefore, it may give rise to a late accelerated expansion of the Universe.