5 papers
Linear Response and the Validity of the Semi-Classical Approximation in Gravity
Paul R. Anderson, Carmen Molina-Paris, Emil Mottola
We propose a quantitative test for the validity of the semi-classical approximation in gravity, namely that the solutions to the semi-classical equations should be stable to linear…
Effective potential for the reaction-diffusion-decay system
David Hochberg, Carmen Molina-Paris, Juan Perez-Mercader +1
In previous work [cond-mat/9904207,cond-mat/9904215] we have developed a general method for casting stochastic partial differential equations (SPDEs) into a functional integral for…
Effective potential for classical field theories subject to stochastic noise
David Hochberg, Carmen Molina-Paris, Juan Perez-Mercader +1
Classical field theories coupled to stochastic noise provide an extremely powerful tool for modeling phenomena as diverse as turbulence, pattern-formation, and the structural devel…
Energy-Momentum Tensor and Particle Creation in the de Sitter Universe
Carmen Molina-Paris
For a quantum field in a curved background the choice of the vacuum state is crucial. We exhibit a vacuum state in which the expectation values of the energy and pressure allow an…
Gauge Theory Without Ghosts
Bryce DeWitt, Carmen Molina-Paris
A quantum effective action for gauge field theories is constructed that is gauge invariant and independent of the choice of gauge breaking terms and the ghost determinant.