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The Institute of Physics ( IOP ) по журналам "Classical and Quantum Gravity"

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  • P S Green; T Hubsch (1989-03-01)
    The authors study the triple products of (1,1)-forms for Calabi-Yau manifolds, and derive them in closed form for those that are constructed as smooth hypersurfaces in products of semi-ample complex surfaces, or are complete ...
  • Ted Jacobson (1996-08-01)
    The rank-1 sector of classical Ashtekar gravity is considered, motivated by the degeneracy of the metric along the Wilson lines in quantum loop states. It is found that the lines behave like (1 + 1)-dimensional spacetimes ...
  • W Siegel (1986-03-01)
    The author shows that the previously proposed form of supergravity with 32 off-shell components (instead of the usual 24 for minimal or 40 for non-minimal) is reducible, and represents only a particular coupling of ...
  • R Coquereaux; G Esposito-Farese (1990-09-01)
    The Lagrangian describing the interactions of gravity, electromagnetism and the Jordan-Thiry-Kaluza-Klein scalar field is quantised by using the background field method. The authors compute all the divergences appearing ...
  • Giampiero Esposito; Alexander Yu Kamenshchik; Giuseppe Pollifrone (1996-05-01)
    This paper applies -function regularization to evaluate the 1-loop effective action for scalar field theories and Euclidean Maxwell theory in the presence of boundaries. After a comparison of two techniques developed in ...
  • A G Mirzabekian; G A Vilkovisky (1995-09-01)
    We present the solution of the problem of asymptotic terms discovered in the 1-loop form factors of the gravitational effective action. Owing to certain constraints among their coefficients, which we establish, these terms ...
  • Eric Bergshoeff; Ergin Sezgin; Antoine Van Proeyen (1999-10-01)
    We construct the supercurrent multiplet that contains the energy-momentum tensor of the (2,0) tensor multiplet. By coupling this multiplet of currents to the fields of conformal supergravity, we first construct the linearized ...
  • A Hosoya; K Nakao (1990-02-01)
    The (2+1)-dimensional pure Einstein gravity is studied in the ADM formalism. The authors solve the initial value and the time evolution problems with a closed Riemann surface being an initial surface, choosing the time ...
  • Chol-Bu Kim; T Shimizu; K Yoshida (1992-05-01)
    The (2+1)-dimensional quantum gravity coupled with a spinor field is considered in the connection representation. The canonical structure of the theory is discussed and gauge invariant phase space variables are identified. ...
  • V Husain (1992-03-01)
    A three-dimensional generally covariant theory is described that has a 2+1 canonical decomposition in which the Hamiltonian constraint, which generates the dynamics, is absent. Physical observables for the theory are ...
  • H Waelbroeck (1990-05-01)
    This is a theory of 2+1 gravity with a spacelike lattice and continuous time. It is derived from the Chern-Simons formulation of 2+1 gravity, in which the frame vectors are canonically conjugate to the SO(2, 1) connection. ...
  • A Ashtekar; V Husain; C Rovelli; J Samuel; L Smolin (1989-10-01)
    2+1 Einstein gravity is used as a toy model for testing a program for nonperturbative canonical quantisation of the 3+1 theory. The program can be successfully implemented in the model and leads to a surprisingly rich ...
  • J E Nelson; T Regge (1992-12-01)
    The authors review some recent results obtained which concern quantum gravity in 2+1 (2 space, 1 time) dimensions. In 2+1 dimensions the Einstein-Hilbert first order action with cosmological constant can be written as a ...
  • Jerzy Lewandowski; Jacek Wisniewski (1997-03-01)
    The rank-2 sector of classical (3 + 1)-dimensional Ashtekar gravity is considered. It is found that the consistency of the evolution equations with the reality of the volume requires that the 3-surface of initial data is ...
  • R A d'Inverno; J A Vickers (1995-03-01)
    We derive a 2+2 formulation of Ashtekar variables, focusing on the important special case of a double null foliation of spacetime. The significance of the 2+2 formalism in general is that it isolates the true gravitational ...
  • J H Yoon (1999-06-01)
    We discuss the (2,2)-formalism of general relativity based on the (2,2)-fibration of a generic four-dimensional spacetime of the Lorentzian signature. In this formalism general relativity is describable as a Yang-Mills ...
  • M Bodner; A C Cadavid; S Ferrara (1991-05-05)
    The compactification of D=10 type IIA supergravity (the point-field theory limit of the type IIA superstring) on a Calabi-Yau manifold ((2.2) vacuum) is performed. The resulting D=4, N=2 effective supergravity Lagrangian ...
  • Ingemar Bengtsson (1995-07-01)
    Riemannian geometry in four dimensions, including Einstein's equations, can be described by means of a connection that annihilates a triad of 2-forms (rather than a tetrad of vector fields). Our treatment of the conformal ...
  • Jerzy Lewandowski; Andrzej Okolw (2000-02-07)
    We introduce a new spinorial, BF-like canonical theory for the Einstein gravity. This is the first, to the best of our knowledge, 2-form canonical approach which describes real, Lorentzian gravity and uses only the self-dual ...
  • W Krivan; H Herold (1995-09-01)
    We study the mean curvature H of r = constant surfaces in spacelike hypersurfaces of the Kerr spacetimes. These surfaces are compared to those which are defined by constant mean curvature. As a result of the calculations, ...