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Autor:
Ferraro, Rafael, Sforza, Daniel M.
Publikováno v:
Eur. J. Phys. 26 (2005) 195-204.
95 years before Special Relativity was born, Arago attempted to detect the absolute motion of the Earth by measuring the deflection of starlight passing through a prism fixed to the Earth. The null result of this experiment gave rise to the Fresnel's
Externí odkaz:
http://arxiv.org/abs/physics/0412055
Autor:
Ferraro, Rafael, Sforza, Daniel M.
Publikováno v:
Phys.Rev. D64 (2001) 024020
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 studied as a model for quantizing generally covariant gauge theories. T
Externí odkaz:
http://arxiv.org/abs/gr-qc/0102062
Autor:
Sforza, Daniel M.
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 system to be studied is one featuring a constraint quadratic in the mome
Externí odkaz:
http://arxiv.org/abs/gr-qc/0012111
Autor:
Ferraro, Rafael, Sforza, Daniel M.
Publikováno v:
Nucl.Phys.Proc.Suppl. 88 (2000) 322-325
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 whose potential can be factorized as a never null function times a gaug
Externí odkaz:
http://arxiv.org/abs/gr-qc/0010025
Publikováno v:
Gen.Rel.Grav. 28 (1996) 1129
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 generation at the quantum stage can be thought as a consequence of an ins
Externí odkaz:
http://arxiv.org/abs/gr-qc/0006028
Autor:
Ferraro, Rafael, Sforza, Daniel M.
Publikováno v:
Phys.Rev. D59 (1999) 107503
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 exhibits a suitable behavior with respect to it. The quantization of the syst
Externí odkaz:
http://arxiv.org/abs/gr-qc/9808064
Autor:
Ferraro, Rafael, Sforza, Daniel M.
Publikováno v:
Phys.Rev. D55 (1997) 4785-4790
The BRST generator is realized as a Hermitian nilpotent operator for a finite-dimensional gauge system featuring a quadratic super-Hamiltonian and linear supermomentum constraints. As a result, the emerging ordering for the Hamiltonian constraint is
Externí odkaz:
http://arxiv.org/abs/hep-th/9603192
Autor:
Singh, Ram P., Brown, Vanessa M., Chaudhari, Abhijit, Khan, Arshad H., Ossadtchi, Alex, Sforza, Daniel M., Meadors, A.Ken, Cherry, Simon R., Leahy, Richard M., Smith, Desmond J. *
Publikováno v:
In Journal of Neuroscience Methods 2003 125(1):93-101
