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General properties of the decay amplitudes for massless particles
(ELSEVIER SCIENCE BV, 1996)We derive the kinematical constraints which characterize the decay of any massless particle in flat spacetime. We show that in perturbation theory the decay probabilities of photons and YangMills bosons vanish to all ... 
Effect of a scaledependent cosmological term on the motion of small test particles in a Schwarzschild background
(ELSEVIER SCIENCE BV, 1999)It was recently suggested that the gravitational action could contain a scaledependent cosmological term, depending on the length or momentum scale characteristic of the processes under consideration. In this work we ... 
Geodesic round trips by parallel transport in quantum gravity
(AMERICAN PHYSICAL SOC, 1993)We study the vacuum correlations of a gravitational field in any dimension N > 2 using the perturbative expansion to order G. It is known that the usual Green's functions are meaningless in quantum gravity; moreover, we ... 
On the motion of test particles in a fluctuating gravitational field
(AMER INST PHYSICS, 1992)In this paper the "free fall" motion of a test tetrad in a weak gravitational field is studied. This is done with the intention of exploring the geometry locally through geodesics and parallel transport. By use of the ... 
Radial gauge in poincare gauge fieldtheories
(AMER INST PHYSICS, 1990)The generalization of the Fock–Schwinger or ‘‘radial’’ gauge condition xiAi =0 to the gauge theories of the Poincaré group, which describe the gravitational field, is treated. It is shown that the choice of a radial gauge ... 
The propagator in the radial gauge
(AMER INST PHYSICS, 1992)The solutions of the equation for the propagator in the radial gauge x(mu)A(mu)(x) = 0 are studied. After finding a particular solution GAMMA(murho)(x,y), the most general solution G(murho)0(x,y) of the homogeneous ... 
Vacuum correlations in quantum gravity
(Springer, 1992)We give a lowestorder estimation of some invariant correlation functions of quantized Einstein gravity in any dimension N > 2. The nonperturbative evaluation of such functions would play an important role in the Monte ... 
Vacuum correlations in quantum gravity
(ELSEVIER SCIENCE BV, 1992)We give a lowestorder estimation of some invariant correlation functions of quantized Einstein gravity in any dimension N > 2. The nonperturbative evaluation of such functions would play an important role in the Monte ... 
The radial gauge propagators in quantum gravity
(ACADEMIC PRESS INC JNLCOMP SUBSCRIPTIONS, 1993)We give a general procedure for extracting the propagators in gauge theories in the presence of a sharp gauge fixing and we apply it to derive the propagators in quantum gravity in the radial gauge, both in the first and ...