309 citations · 2.5k across the 104 of their papers we have counts for
4 papers · 1 filter
The Cosmological Constant and Horava-Lifshitz Gravity
Corrado Appignani, Roberto Casadio, S. Shankaranarayanan
Horava-Lifshitz theory of gravity with detailed balance is plagued by the presence of a negative bare (or geometrical) cosmological constant which makes its cosmology clash with ob…
A note on second-order perturbations of non-canonical scalar fields
Corrado Appignani, Roberto Casadio, S. Shankaranarayanan
We study second-order perturbations for a general non-canonical scalar field, minimally coupled to gravity, on the unperturbed FRW background, where metric fluctuations are neglect…
What-if inflaton is a spinor condensate?
S. Shankaranarayanan
In the usual cosmological inflationary scenarios, the scalar field -- inflaton -- is usually assumed to be an elementary field. In this essay, we ask: What are the observational si…
Path integral duality modified propagators in spacetimes with constant curvature
Dawood Kothawala, L. Sriramkumar, S. Shankaranarayanan +1
The hypothesis of path integral duality provides a prescription to evaluate the propagator of a free, quantum scalar field in a given classical background, taking into account the…