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- Green Schwarz, Superstring A Restuccia, J Stephany
- 1993

We describe a canonical covariant approach to the quantization of the Green-Schwarz superstring. The approach is first applied to the canonical covariant quantization of the Brink and Schwarz superparticle. The Kallosh action is obtained in this case, with the correct BRST cohomology.

- N Hatcher, A Restuccia, J Stephany, Simon Universidad, Bolivar
- 2005

We present the complete set of N = 1, D = 4 quantum algebras associated to massive superparticles. We obtain the explicit solution of these algebras realized in terms of unconstrained operators acting on the Hilbert space of superfields. These solutions are expressed in terms of the chiral, anti-chiral and tensorial projectors which define the three… (More)

Aims To report the longer term outcomes following either a strategy of endovascular repair first or open repair of ruptured abdominal aortic aneurysm, which are necessary for both patient and clinical decision-making. Methods and results This pragmatic multicentre (29 UK and 1 Canada) trial randomized 613 patients with a clinical diagnosis of ruptured… (More)

- R Gianvittorio, A Restuccia, J Stephany
- 2006

In this paper we extend the bosonic D-brane action in D = 10 obtained by duality from the D = 11 membrane wrapped on S 1 to an SU (2) non abelian system. This system presents only first class constraints, whose algebra closes off-shell and generalizes the algebra of diffeomorphisms of the D2-brane to include non abelian symmetry generators. From the SU (2)… (More)

- Nicolás Hatcher, A Restuccia, J Stephany
- 2006

We identify the quantum algebra of position and momentum operators for a quantum system bearing an irreducible representation of the super Poincaré algebra in the N extended superspace. This algebra is noncommutative for the position operators. We use the properties of superprojectors in D = 4 N superspace to construct explicit position and momentum… (More)

- N Hatcher, A Restuccia, J Stephany, Simon Universidad, Bolivar
- 2005

We consider the action of the D = 11 supermembrane wrapping a compactified sector of the target space in such a way that a non trivial central charge in the SUSY algebra is induced. We show that the dynamics of the center of mass corresponds to a superparticle in D = 9 with additional fermionic terms associated to the central charges. We perform the… (More)

- D E Díaz, J Stephany, Simon Universidad, Bolivar
- 2002

We describe the quantum and classical radiation by a uniformly accelerating point source in terms of the elementary processes of absorption and emission of Rindler scalar photons of the Fulling-Davies-Unruh bath observed by a co-accelerating observer.To this end we compute the emission rate by a DeWitt detector of a Minkowski scalar particle with defined… (More)

- J Stephany, Simon Universidad, Bolivar
- 1996

Topologically non trivial effects appearing in the discussion of duality transformations in higher genus manifolds are discussed in a simple example , and their relation with the properties of Topological Field Theories is established.

In this article, the authors report two observations of short delusion that occurred after taking Guronsan--a psychostimulant commercialized in France--for a few days, with the intention of maintaining a total deprivation of sleep for three days in both cases. The ensuing clinical picture included a state of depersonalization, a loss of the sense of… (More)

- J P Lupi, A Restuccia, J Stephany, Simon Universidad, Bolivar
- 1996

We study the interaction of non-Abelian topological BF theories defined on two dimensional manifolds with point sources carrying non-Abelian charges. We identify the most general solution for the field equations on simply and multiply connected two-manifolds. Taking the particular choice of the so-called extended Poincaré group as the gauge group we discuss… (More)