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Infrared Propagator Corrections for Constant Deceleration
T. M. Janssen, S. P. Miao, T. Prokopec +1
We derive the propagator for a massless, minimally coupled scalar on a -dimensional, spatially flat, homogeneous and isotropic background with arbitrary constant deceleration pa…
Graviton one-loop effective action and inflationary dynamics
Tomas Janssen, Shun-Pei Miao, Tomislav Prokopec
We consider the one-loop effective action due to gravitons in a FLRW background with constant epsilon=-(dH/dt)/H^2. By expanding around epsilon=0 (corresponding to an expansion aro…
A graviton propagator for inflation
Tomas Janssen, Tomislav Prokopec
We construct the scalar and graviton propagator in quasi de Sitter space up to first order in the slow roll parameter . After a rescaling, the propagators are…
Problems and hopes in nonsymmetric gravity
Tomas Janssen, Tomislav Prokopec
We consider the linearized nonsymmetric theory of gravitation (NGT) within the background of an expanding universe and near a Schwarzschild mass. We show that the theory always dev…
Instabilities in the nonsymmetric theory of gravitation
Tomas Janssen, Tomislav Prokopec
We consider the linearized nonsymmetric theory of gravitation (NGT) within the background of an expanding universe and near a Schwarzschild metric. We show that the theory always d…