13 citations · 37 across the 19 of their papers we have counts for
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Quantization of a generally covariant gauge system with two super Hamiltonian constraints
Rafael Ferraro, Daniel M. Sforza
The Becci-Rouet-Stora-Tyutin (BRST) operator quantization of a finite-dimensional gauge system featuring two quadratic super Hamiltonian and m linear supermomentum constraints is s…
Quantization of Generally Covariant Systems
Daniel M. Sforza
Finite dimensional models that mimic the constraint structure of Einstein's General Relativity are quantized in the framework of BRST and Dirac's canonical formalisms. The first sy…
Operator ordering for generally covariant systems
Rafael Ferraro, Daniel M. Sforza
The constraint operators belonging to a generally covariant system are found out within the framework of the BRST formalism. The result embraces quadratic Hamiltonian constraints w…
Entropy generation in cosmological particle creation
Mario A. Castagnino, Fabian H. Gaioli, Daniel M. Sforza
A very simplified model of the Universe is considered in order to propose an alternative approach to the irreversible evolution of the Universe at very early times. The entropy gen…
Quantization of generally covariant systems with extrinsic time
Rafael Ferraro, Daniel M. Sforza
A generally covariant system can be deparametrized by means of an ``extrinsic'' time, provided that the metric has a conformal ``temporal'' Killing vector and the potential exhibit…