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On the cosmological constant problem
- I. Antoniadis, N. C. Tsamis
- Physics, Mathematics
- 23 August 1984
The Quantum Gravitational Back-Reaction on Inflation
- N. C. Tsamis, R. Woodard
- Physics
- 1 February 1995
Abstract We describe our recent calculation of two-loop corrections to the expansion rate of an initially inflating universe on the manifoldT3× R . If correct, our result proves that quantum…
The coincidence limit of the graviton propagator in de Donder gauge on de Sitter background
- S. Miao, N. C. Tsamis, R. Woodard
- Physics, Mathematics
- 5 June 2011
We explicitly work out the de Sitter breaking contributions to the recent solution for the de Donder gauge graviton propagator on de Sitter. We also provide explicit power series expansions for the…
Stochastic quantum gravitational inflation
- N. C. Tsamis, R. Woodard
- Physics
- 23 May 2005
Stochastic inflationary scalar electrodynamics
- T. Prokopec, N. C. Tsamis, R. Woodard
- Physics
- 5 July 2007
A simplified quantum gravitational model of inflation
- N. C. Tsamis, R. Woodard
- Physics
- 31 July 2008
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 renormalization of the…
Maximally symmetric vector propagator
- N. C. Tsamis, R. Woodard
- Physics
- 14 August 2006
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 space-time and massless…
Weyl Invariance and the Cosmological Constant*
- N. C. Tsamis
- Physics
A systematic study of a gravitational action possessing local conformal in-variance is undertaken. The spontaneous breaking of the conformal symmetry induces general relativity as an effective long…
Relaxing the cosmological constant
- N. C. Tsamis, R. Woodard
- Physics
- 11 March 1993
Graviton propagator in a general invariant gauge on de Sitter
- P. J. Mora, N. C. Tsamis, R. Woodard
- Physics
- 20 May 2012
We construct the graviton propagator on de Sitter background in the one parameter family of exact, de Sitter invariant gauges. Our result takes the form of a universal spin two part and a gauge…
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