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gr-qc2025
Unified Dark Matter and Dark Energy in a model of Non-Canonical Scalar-Tensor Theory
Nihal Jalal Pullisseri, Sanil Unnikrishnan
We consider a model of non-canonical scalar-tensor theory in which the kinetic term in the Brans-Dicke action is replaced by a non-canonical scalar field Lagrangian $\mathcal{L}(X,…
gr-qc2024
The effective speed of sound in cosmological perturbation theory
Sanil Unnikrishnan
In a multi-field/fluid cosmological system consisting of minimally coupled canonical scalar fields, non-canonical scalar fields, and barotropic perfect fluids, we introduce a new d…
gr-qc2005★ 5 cited
Cosmic acceleration in a model of scalar-tensor gravitation
Sanil Unnikrishnan, T. R. Seshadri
In this paper we consider a model of scalar-tensor theory of gravitation in which the scalar field, determines the gravitational coupling G and has a Lagrangian of the form, $\…