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Souza Dutra, A. de.
Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)1992
Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)1992
AbstractAbstract
[en] The Green functions of the two versions of the two versions of the generalized Schwinger model, the anomalous and the non-anomalous one, in their higher order Lagrangian density form are calculated. Furthermore it is shown through a sequence of transformations that the bosonized Lagrangian density is equivalent to the former, at least for the bosonic correlation functions. The introduction of the sources from the beginning, leading to a gauge-invariant source term is also considered. It is verified that the two models have the same correlation functions only of the gauge-invariant sector is taken into account. Finally it is presented a generalization of the Wess-Zumino term, and its physical consequences are studied, in particular the appearance of gauge-dependent massive excitations. (author)
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1992; 33 p; ISSN 0029-3865; 

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[en] We show that the Tomonaga-Schwinger formalism in quantum field theory provides a manifestly Lorentz covariant description of an Einstein-Podolsky-Rosen (EPR) correlated state defined on a curved-space-like surface. This avoids the notion of a universal time and clearly demarcates between the completion of the measuring process on a member of an EPR pair and its nonlocal effect on the state of its partner. Being reciprocal and restricted to a spacelike surface, the latter is deterministic but not causal and is consistent with Lorentz invariance
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Keita, Kaniba Mady; Wu Feng; Zhong Ming, E-mail: fengwu@ncu.edu.cn, E-mail: zhongm@nudt.edu.cn
arXiv e-print [ PDF ]2009
arXiv e-print [ PDF ]2009
AbstractAbstract
[en] A study of the noncommutative Schwinger model is presented. It is shown that the Schwinger mass is not modified by the noncommutativity of spacetime till the first nontrivial order in the noncommutative parameter. Instead, a higher derivative kinetic term is dynamically generated by the lowest-order vacuum polarization diagrams. We argue that in the framework of the Seiberg-Witten map the feature of non-unitarity for a field theory with spacetime noncommutativity is characterized by the presence of higher derivative kinetic terms. The θ-expanded version of a unitary theory will not generate the lowest-order higher derivative quadratic terms.
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S0370-2693(09)01245-3; Available from http://dx.doi.org/10.1016/j.physletb.2009.10.048; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] The Bohmian interpretation of the many-fingered time (MFT) Tomonaga-Schwinger formulation of quantum field theory (QFT) describes MFT fields, which provides a covariant Bohmian interpretation of QFT without introducing a preferred foliation of spacetime
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S0375-9601(05)01386-1; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] This is a more detailed version of our recent paper where we proposed, from first principles, a direct method for evaluating the exact fermion propagator in the presence of a general background field at finite temperature. This can, in turn, be used to determine the finite temperature effective action for the system. As applications, we discuss the complete one loop finite temperature effective actions for 0+1 dimensional QED as well as for the Schwinger model in detail. These effective actions, which are derived in the real time (closed time path) formalism, generate systematically all the Feynman amplitudes calculated in thermal perturbation theory and also show that the retarded (advanced) amplitudes vanish in these theories. Various other aspects of the problem are also discussed in detail.
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(c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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No abstract available
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Progress of Theoretical Physics (Kyoto); v. 52(1); p. 304-312
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Das, Ashok; Frenkel, J., E-mail: das@pas.rochester.edu, E-mail: jfrenkel@fma.if.usp.br
arXiv e-print [ PDF ]2009
arXiv e-print [ PDF ]2009
AbstractAbstract
[en] We present, from first principles, a direct method for evaluating the exact fermion propagator in the presence of a general background field at finite temperature, which can be used to determine the finite temperature effective action for the system. As applications, we determine the complete one loop finite temperature effective actions for (0+1)-dimensional QED as well as the Schwinger model. These effective actions, which are derived in the real time (closed time path) formalism, generate systematically all the Feynman amplitudes calculated in thermal perturbation theory and also show that the retarded (advanced) amplitudes vanish in these theories.
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S0370-2693(09)01030-2; Available from http://dx.doi.org/10.1016/j.physletb.2009.08.054; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Pinto, Marcos V.C.; Souza, Carlos F.; Santonja, Antonio S.
Proceedings of the 15. national meeting on particle physics and fields. Abstracts1994
Proceedings of the 15. national meeting on particle physics and fields. Abstracts1994
AbstractAbstract
[en] Short communication
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Sociedade Brasileira de Fisica, Sao Paulo, SP (Brazil); 85 p; 1994; p. 55; 15. national meeting on particle physics and fields; 15. encontro nacional de fisica de particulas e campos; Angra dos Reis, RJ (Brazil); 4-8 Oct 1994; Available from the Library of the Brazilian Nuclear Energy Commission, Rio de Janeiro
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Alves, Van S.; Gomes, Marcelo O.C.
Proceedings of the 15. national meeting on particle physics and fields. Abstracts1994
Proceedings of the 15. national meeting on particle physics and fields. Abstracts1994
AbstractAbstract
[en] Short communication
Original Title
Estados ligados em modelos bi-dimensionais: o caso da QED2 e de um modelo com interacoes quarticas fermionicas
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Sociedade Brasileira de Fisica, Sao Paulo, SP (Brazil); 85 p; 1994; p. 53; 15. national meeting on particle physics and fields; 15. encontro nacional de fisica de particulas e campos; Angra dos Reis, RJ (Brazil); 4-8 Oct 1994; Available from the Library of the Brazilian Nuclear Energy Commission, Rio de Janeiro
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[en] One can approximate path integrals in free two-dimensional quantum electrodynamics by expanding the fields in terms of a complete set of functions, by truncating the expansion, and by using Monte-Carlo techniques to evaluate the resulting finite-dimensional integrals. Using 3131 functions of compact support, we computed the Wilson-loop functional to an accuracy of 8 to 14% for reasonably sized loops. These results changed by less than 6% when we delayed the loops by one-tenth of the duration of the model universe. (orig.)
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CONTRACT DE-AC04-81ER40042; CODEN: PYLBA.
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Phys. Lett., B; ISSN 0370-2693;
; v. 143(1-3); p. 213-216

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