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On the cosmological constant problem

- I. Antoniadis, N. Tsamis
- Physics
- 23 August 1984

Abstract We prove that Weyl invariant theories of gravity possess a remarkable property which, under very general assumptions, explains the stability of flat space-time. We show explicitly how… Expand

595 36- PDF

Maximally symmetric vector propagator

- N. 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… Expand

53 5- PDF

The Quantum Gravitational Back-Reaction on Inflation

- N. Tsamis, R. Woodard
- Physics
- 15 February 1996

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… Expand

195 3- PDF

Stochastic quantum gravitational inflation

- N. Tsamis, R. Woodard
- Physics
- 23 May 2005

Abstract During inflation explicit perturbative computations of quantum field theories which contain massless, nonconformal fields exhibit secular effects that grow as powers of the logarithm of the… Expand

144 3- PDF

Stochastic inflationary scalar electrodynamics

- T. Prokopec, N. Tsamis, R. Woodard
- Physics
- 5 July 2007

Abstract 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 allows one to… Expand

124 2- PDF

Weyl Invariance and the Cosmological Constant*

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… Expand

2 2- PDF

The graviton propagator in de Donder gauge on de Sitter background

- S. Miao, N. Tsamis, R. Woodard
- Physics
- 5 June 2011

We construct the graviton propagator on de Sitter background in exact de Donder gauge. We prove that it must break de Sitter invariance, just like the propagator of the massless, minimally coupled… Expand

45 2- PDF

Relaxing the cosmological constant

- N. Tsamis, R. Woodard
- Physics
- 11 March 1993

A non-zero cosmological constant allows massless gravitons to self-interact via a coupling of dimension three. If the cosmological constant is positive then the background geometry will subject… Expand

134 1

The physical basis for infra-red divergences in inflationary quantum gravity

- N. Tsamis, R. Woodard
- Physics
- 1 December 1994

We consider tree-order graviton scattering amplitudes on a -dimensional de Sitter background in conformally flat coordinates. Infra-red divergences which cannot be absorbed using conventional… Expand

75 1

de Sitter breaking through infrared divergences

- S. Miao, N. Tsamis, R. Woodard
- Physics
- 22 February 2010

Just because the propagator of some field obeys a de Sitter invariant equation does not mean it possesses a de Sitter invariant solution. The classic example is the propagator of a massless,… Expand

58 1- PDF

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