I. Negru

Publications (9)3.63 Total impact

• Source

  Available from: Eugen-Mihaita Cioroianu

  Article: Reducible second-class constraints of order L: An irreducible approach

  C. Bizdadea, E. M. Cioroianu, I. Negru, S. O. Saliu, S. C. Sararu, O. Balus
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  ABSTRACT: An irreducible canonical approach to second-class constraints reducible of an arbitrary order is given. This method generalizes our previous results from [Europhys. Lett. 50 (2000) 169, J. Phys. A: Math. Theor. 40 (2007) 14537] for first- and respectively second-order reducible second-class constraints. The general procedure is illustrated on Abelian gauge-fixed p-forms.
  05/2009;
• Source

  Available from: ArXiv

  Article: Couplings between a single massless tensor field with the mixed symmetry (3,1) and one vector field

  C. Bizdadea, C. C. Ciobirca, I. Negru, S. O. Saliu
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  ABSTRACT: Under the hypotheses of smoothness in the coupling constant, locality, Lorentz covariance, and Poincare invariance of the deformations, combined with the preservation of the number of derivatives on each field, the consistent interactions between a single free massless tensor gauge field with the mixed symmetry of a two-column Young diagram of the type (3,1) and one Abelian vector field have been investigated. The computations are done with the help of the deformation theory based on a cohomological approach, in the context of the antifield-BRST formalism. The main result is that there exist nontrivial cross-couplings between these types of fields in five spatiotemporal dimensions, which break the PT invariance and allow for the deformation of the gauge transformations of the vector field, but not of the gauge algebra.
  06/2007;
• Source

  Available from: ArXiv

  Article: On the generalized Freedman-Townsend model

  C. Bizdadea, E. M. Cioroianu, I. Negru, S. O. Saliu, S. C. Sararu
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  ABSTRACT: Consistent interactions that can be added to a free, Abelian gauge theory comprising a finite collection of BF models and a finite set of two-form gauge fields (with the Lagrangian action written in first-order form as a sum of Abelian Freedman-Townsend models) are constructed from the deformation of the solution to the master equation based on specific cohomological techniques. Under the hypotheses of smoothness in the coupling constant, locality, Lorentz covariance, and Poincare invariance of the interactions, supplemented with the requirement on the preservation of the number of derivatives on each field with respect to the free theory, we obtain that the deformation procedure modifies the Lagrangian action, the gauge transformations as well as the accompanying algebra. The interacting Lagrangian action contains a generalized version of non-Abelian Freedman-Townsend model. The consistency of interactions to all orders in the coupling constant unfolds certain equations, which are shown to have solutions.
  05/2007;
• Article: Lagrangian interactions within a special class of covariant mixed-symmetry type tensor gauge fields

  C. Bizdadea, E.M. Cioroianu, I. Negru, S.O. Saliu
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  ABSTRACT: Consistent non-trivial interactions within a special class of covariant mixed-symmetry type tensor gauge fields of degree three are constructed from the deformation of the solution to the master equation combined with specific cohomological techniques. In spacetime dimensions strictly greater than four, the only consistent interaction terms are those gauge invariant under the original symmetry. Only in four spacetime dimensions the gauge symmetry is found to be deformed.
  European Physical Journal C 03/2003; 27(3):457-465. · 3.63 Impact Factor
• Source

  Available from: arxiv.org

  Article: Lagrangian interactions within a special class of covariant mixed-symmetry type tensor gauge fields

  C. Bizdadea, E. M. Cioroianu, I. Negru, S. O. Saliu
  [show abstract] [hide abstract]
  ABSTRACT: Consistent nontrivial interactions within a special class of covariant mixed-symmetry type tensor gauge fields of degree three are constructed from the deformation of the solution to the master equation combined with specific cohomological techniques. In spacetime dimensions strictly greater than four, the only consistent interaction terms are those gauge invariant under the original symmetry. Only in four spacetime dimensions the gauge symmetry is found deformed.
  12/2002;
• Source

  Available from: arxiv.org

  Article: Lagrangian cohomological couplings among vector fields and matter fields

  C. Bizdadea, E. M. Cioroianu, M. T. Miauta, I. Negru, S. O. Saliu
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  ABSTRACT: Consistent couplings between a set of vector fields and a system of matter fields are analysed in the framework of Lagrangian BRST cohomology. Comment: 18 pages, LaTeX 2.e
  01/2002;
• Source

  Available from: arxiv.org

  Article: Irreducible Hamiltonian BRST analysis of Stueckelberg coupled p-form gauge theories

  C. Bizdadea, I. Negru, S. O. Saliu
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  ABSTRACT: The irreducible Hamiltonian BRST symmetry for p-form gauge theories with Stueckelberg coupling is derived. The cornerstone of our approach is represented by the construction of an irreducible theory that is equivalent from the point of view of the BRST formalism with the original system. The equivalence makes permissible the substitution of the BRST quantization of the reducible model by that of the irreducible theory. Our procedure maintains the Lorentz covariance of the irreducible path integral. Comment: 29 pages, LaTeX 2.09
  12/1999;
• Source

  Available from: arxiv.org

  Article: Irreducible Hamiltonian approach to the Freedman-Townsend model

  C. Bizdadea, I. Negru, S. O. Saliu
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  ABSTRACT: The irreducible BRST symmetry for the Freedman-Townsend model is derived. The comparison with the standard reducible approach is also addressed. Comment: 18 pages, LaTeX 2.09
  12/1999;
• Source

  Available from: ArXiv

  Article: Irreducible antifield BRST-anti-BRST formalism for reducible gauge theories

  C. Bizdadea, I. Negru, S. O. Saliu
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  ABSTRACT: In this paper we develop an irreducible antifield BRST-anti-BRST formalism for reducible gauge theories. Comment: 34 pages, LaTeX 2.09
  12/1999;