15 citations · 35 across the 6 of their papers we have counts for
6 papers
A big bounce, slow-roll inflation and dark energy from conformal gravity
Jack Gegenberg, Shohreh Rahmati, Sanjeev S. Seahra
We examine the cosmological sector of a gauge theory of gravity based on the SO(4,2) conformal group of Minkowski space. We allow for conventional matter coupled to the spacetime m…
Linearized gravity with matter time
Masooma Ali, Viqar Husain, Shohreh Rahmati +1
We study general relativity with pressureless dust in the canonical formulation, with the dust field chosen as a matter-time gauge. The resulting theory has three physical degrees…
Linearized 3D gravity with dust
Viqar Husain, Shohreh Rahmati, Jonathan Ziprick
Three-dimensional gravity coupled to pressureless dust is a field theory with one local degree of freedom. In the canonical framework, the dust-time gauge encodes this physical deg…
Infrared modification of gravity from conformal symmetry
Jack Gegenberg, Shohreh Rahmati, Sanjeev S. Seahra
We reconsider a gauge theory of gravity in which the gauge group is the conformal group SO(4,2) and the action is of the Yang-Mills form, quadratic in the curvature. The resulting…
Frustration of resonant preheating by exotic kinetic terms
Shohreh Rahmati, Sanjeev S. Seahra
We study the effects of exotic kinetic terms on parametric resonance during the preheating epoch of the early universe. Specifically, we consider modifications to the action of ord…
A Note on Vacuum Polarisation and Hawking Radiation
Arundhati Dasgupta, Shohreh Rahmati
We re-examine vacuum polarisation of a scalar field in a quasi-local volume including the horizon. We find that Hawking radiation rate is derived as a pure decay of vacuum due to s…