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Faraggi, A.E.

Florida Univ., Gainesville, FL (United States). Inst. for Fundamental Theory. Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)

Florida Univ., Gainesville, FL (United States). Inst. for Fundamental Theory. Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)

AbstractAbstract

[en] The realistic free fermionic models have had remarkable success in providing plausible explanations for various properties of the Standard Model which include the natural appearance of three generations, the explanation of the heavy top quark mass and the qualitative structure of the fermion mass spectrum in general, the stability of the proton and more. These intriguing achievements makes evident the need to understand the general space of these models. While the number of possibilities is large, general patterns can be extracted. In this paper the author presents a detailed discussion on the construction of the realistic free fermionic models with the aim of providing some insight into the basic structures and building blocks that enter the construction. The role of free phases in the determination of the phenomenology of the models is discussed in detail. The author discusses the connection between the free phases and mirror symmetry in (2,2) models and the corresponding symmetries in the case of (2,0) models. The importance of the free phases in determining the effective low energy phenomenology is illustrated in several examples. The classification of the models in terms of boundary condition selection rules, real world-sheet fermion pairings, exotic matter states and the hidden sector is discussed

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Aug 1997; 44 p; UFIFT-HEP--97-23; CONTRACT FG05-86ER40272; Also available from OSTI as DE98000023; NTIS; US Govt. Printing Office Dep

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Malbouisson, A.P.C.; Silva-Neto, M.B.; Svaiter, N.F.

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

AbstractAbstract

[en] We perform the dimensional reduction of the linear σ model at one-loop level. The effective of the reduced theory obtained from the integration over the nonzero Matsubara frequencies is exhibited. Thermal mass and coupling constant renormalization constants are given, as well as the thermal renormalization group which controls the dependence of the counterterms on the temperature. We also recover, for the reduced theory, the vacuum instability of the model for large N. (author)

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May 1997; 14 p; ISSN 0029-3865; ; 28 refs.

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Manoff, S.; Dimitrov, B.

Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna (Russian Federation)

Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna (Russian Federation)

AbstractAbstract

[en] The Kronecker tensor field, the contraction tensor field, as well as the multi-Kronecker and multi-contraction tensor fields are determined and the action of the covariant differential operator, the Lie differential operator, the curvature operator, and the deviation operator on these tensor fields is established. The commutation relations between the operators Sym and Asym and the covariant and Lie differential operators are considered acting on symmetric and antisymmetric tensor fields over (L

_{n}bar, g)-spacesPrimary Subject

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1998; 22 p; 9 refs.

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Ford, L.H.; Svaiter, N.F.

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

AbstractAbstract

[en] The imposition of boundary conditions upon a quantized field can lead to singular energy densities on the boundary. We treat the boundaries as quantum mechanical objects with nonzero position uncertainty, and show that the singular energy density is removed. This treatment also resolves a long standing paradox concerning the total energy of the minimally coupled and conformally coupled scalar fields. (author)

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Apr 1998; 17 p; ISSN 0029-3865; ; 14 refs., 2 figs.; e-mail: ford at cosmos2.phy.tufts.edu; nfuxsvai at lafex.cbpf.br

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Novello, M.; De Lorenci, V.A.; Elbaz, E.

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

AbstractAbstract

[en] In this paper we present a toy model for the dynamics of a gauge field theory in such way that spin-one particles can be confined in a compact domain. We show that the property of confinement can be associated to the formation of a null surface identified to a horizon. This is due to the presence of an effective geometry generated by the self-interaction of the gauge field that guides the wave propagation of the field. This phenomenon has a striking analogy to the gravitational black hole in Einstein general theory of relativity, separating two domains of spacetime that can be trespassed only into one direction. (author)

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Apr 1998; 16 p; ISSN 0029-3865; ; 4 refs.

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Kachru, S.; Kumar, J.; Silverstein, E.

Stanford Univ., Stanford Linear Accelerator Center, CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Department of Defense, Washington, DC (United States)

Stanford Univ., Stanford Linear Accelerator Center, CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Department of Defense, Washington, DC (United States)

AbstractAbstract

[en] The authors present a nonsupersymmetric orbifold of type 2 string theory and show that it has vanishing cosmological constant at the one and two loop level. They argue heuristically that the cancellation persists at higher loops

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Aug 1998; 28 p; LBNL--41932; SU-ITP--98/35; UCB-PTH--98/33; CONTRACT AC03-76SF00515; GRANT NSF PHY-92-19345; ALSO AVAILABLE FROM OSTI AS DE98059250; NTIS; US GOVT. PRINTING OFFICE DEP

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Barashenkov, V.S.; Yur'ev, M.Z.

Laboratory of Computing Techniques and Automation, Joint Institute for Nuclear Research, Dubna (Russian Federation)

Laboratory of Computing Techniques and Automation, Joint Institute for Nuclear Research, Dubna (Russian Federation)

AbstractAbstract

[en] A system of linearly independent, orthogonal solutions for the Dirac equation is found in a space with a three-dimensional time in the general case of an arbitrary directed particle time trajectory. The properties of these solutions are discussed. The interactions with the electromagnetic field and the transition to the non-relativistic Pauli and Schroedinger equations are considered. Rules of the quantization of the spinor and the electromagnetic fields preserving the positive definiteness of the energy are defined. In contrast to the customary one-time Dirac equation the wave function norm has alternating signs ψ bar ψ = ±1. The sign of these norm is conserved only for an imitable time direction X for a fixed value of the temporal helicity. Another peculiarity consists in the non-Hermeticity of the interaction Hamiltonian which is stipulated by a time dependence of the energy vector components. (author)

Original Title

Kvantovaya teoriya polya s trekhmernym vektorom vremeni

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1999; 24 p; 27 refs., 2 tabs., 2 figs. Submitted to the journal, Teoreticheskaya i Matematicheskaya Fizika

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Schroer, Bert

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

AbstractAbstract

[en] In this article an attempt is made to present very recent conceptual and computational developments in QFT as new manifestation of old well established physical principles. The vehicle for converting the quantum-algebraic aspects of local quantum physics into more classical geometric structures is the modular theory of Tomita. As the above named laureate together with his collaborator showed for the first time, in sufficient generality, its use in physics goes through Einstein causality. This line of research recently gained momentum when it was realized that it is not only of great structural and conceptual innovative power (see section 4), but also promises a new computational road into nonperturbative QFT (section 5) which, picturesquely speaking, enters the subject on the extreme opposite (noncommutative) side relative to (Lagrangian) quantization. (author)

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Apr 1999; 49 p; ISSN 0029-3865; ; 61 refs.; schroer at cbpfsu1.cat.cbpf.br

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Radjimambetov, R.R.; Ibodova, U.R.; Kravchenko, E.V.; Sattarov, M.A.; Umidullaev, Sh.U.

Abstracts of the third international conference on modern problems of nuclear physics

Abstracts of the third international conference on modern problems of nuclear physics

AbstractAbstract

No abstract available

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Uzbekistan Academy of Sciences, Institute of Nuclear Physics, Tashkent (Uzbekistan); Bukhara State Univ., Bukhara (Uzbekistan); Samarkand State Univ., Samarkand (Uzbekistan); Tashkent State Univ., Tashkent (Uzbekistan); Tashkent State Univ., Inst. of Applied Physics, Tashkent (Uzbekistan); Uzbekistan Academy of Sciences, Scientific Association 'Physics-Sun', Tashkent (Uzbekistan); Bukhara Technological Inst., Bukhara (Uzbekistan); 358 p; Aug 1999; p. 150-152; 3. international conference ''Modern problems of nuclear physics''; Bukhara (Uzbekistan); 23-27 Aug 1999; 4 refs.

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AbstractAbstract

[en] A twistor-like formulation of the classical dynamics of free massive particles is proposed which upon quantization results in semion states with helicities s = 1/2 (1/2 + n). A space-time supersymmetric generalization of the model allows one to treat the fields with helicities differing by 1/2 on an equal footing as the components of a single superfield, thus, attributing to them the relative Grassmann statistics. Supersymmetric equations for semions with the helicity 1/4 and 3/4 are obtained and a corresponding local superfield action for a Grassmann semion superfield is constructed. (orig.)

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Journal Article

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ACTION INTEGRAL, ANGULAR MOMENTUM OPERATORS, ANNIHILATION OPERATORS, CLASSICAL MECHANICS, COMMUTATION RELATIONS, CREATION OPERATORS, DYNAMICS, EIGENSTATES, FIELD EQUATIONS, GROUP THEORY, HELICITY, HILBERT SPACE, LAGRANGE EQUATIONS, LAGRANGIAN FIELD THEORY, LINEAR MOMENTUM OPERATORS, LOCALITY, POINCARE GROUPS, QUANTIZATION, REST MASS, SERIES EXPANSION, SL GROUPS, SO-2 GROUPS, SPACE-TIME, SPINOR FIELDS, SPINORS, SUPERMULTIPLETS, SUPERSYMMETRY, SYMMETRY BREAKING, TWISTOR THEORY, WAVE FUNCTIONS

BANACH SPACE, DIFFERENTIAL EQUATIONS, EQUATIONS, FIELD THEORIES, FUNCTIONS, INTEGRALS, LIE GROUPS, MASS, MATHEMATICAL OPERATORS, MATHEMATICAL SPACE, MATHEMATICS, MECHANICS, MULTIPLETS, PARTIAL DIFFERENTIAL EQUATIONS, PARTICLE PROPERTIES, QUANTUM FIELD THEORY, QUANTUM OPERATORS, SO GROUPS, SPACE, SYMMETRY, SYMMETRY GROUPS

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