97 citations · 358 across the 14 of their papers we have counts for
14 papers
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,…
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…
Effect of dark energy sound speed and equation of state on CDM power spectrum
Rizwan Ul Haq Ansari, Sanil Unnikrishnan
We study the influence of equation of state and effective sound speed of the dark energy perturbations on the cold dark matter(CDM) power spectrum.We consider different c…
Emergent Cosmology Revisited
Satadru Bag, Varun Sahni, Yuri Shtanov +1
We explore the possibility of emergent cosmology using the effective potential formalism. We discover new models of emergent cosmology which satisfy the constraints posed by the co…
Consistency relation in power law G-inflation
Sanil Unnikrishnan, S. Shankaranarayanan
In the standard inflationary scenario based on a minimally coupled scalar field, canonical or non-canonical, the subluminal propagation of speed of scalar perturbations ensures the…
Resurrecting power law inflation in the light of Planck results
Sanil Unnikrishnan, Varun Sahni
It is well known that a canonical scalar field with an exponential potential can drive power law inflation (PLI). However, the tensor-to-scalar ratio in such models turns out to be…