769 citations
- Foundation for Research and Technology HellasGR63 papers
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6 papers · 1 filter
A Simplified Quantum Gravitational Model of Inflation
N. C. Tsamis, R. P. Woodard
Inflationary quantum gravity simplifies drastically in the leading logarithm approximation. We show that the only counterterm which contributes in this limit is the 1-loop renormal…
Two loop stress-energy tensor for inflationary scalar electrodynamics
Tomislav Prokopec, Nicholas C. Tsamis, Richard P. Woodard
We calculate the expectation value of the coincident product of two field strength tensors at two loop order in scalar electrodynamics on de Sitter background. The result agrees wi…
Stochastic Inflationary Scalar Electrodynamics
T. Prokopec, N. C. Tsamis, R. P. Woodard
We stochastically formulate the theory of scalar quantum electrodynamics on a de Sitter background. This reproduces the leading infrared logarithms at each loop order. It also allo…
Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
E. O. Kahya, V. K. Onemli
We consider a massless, minimally coupled scalar with a quartic self-interaction which is released in Bunch-Davies vacuum in locally de Sitter background of an inflating universe.…
A Maximally Symmetric Vector Propagator
N. C. Tsamis, R. P. Woodard
We derive the propagator for a massive vector field on a de Sitter background of arbitrary dimension. This propagator is de Sitter invariant and possesses the proper flat spacetime…
Two Loop Scalar Bilinears for Inflationary SQED
T. Prokopec, N. C. Tsamis, R. P. Woodard
We evaluate the one and two loop contributions to the expectation values of two coincident and gauge invariant scalar bilinears in the theory of massless, minimally coupled scalar…