J.F. Bell and T. Damour, Class. Quantum Gravity 13 (1996) 3121. Home/Search Document Not in Database Summary Related Articles Check |
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Lorentz Invariance and the Cosmological Constant - Bertolami (1997) (Correct)
.... from the limits on the parametrized post Newtonian parameter ff 3 obtained from the pulse period of pulsars [54] and millisecond pulsars [55] This parameter vanishes identically in general relativity and the recent bound jff 3 j 2:2 Theta 10 Gamma20 obtained from binary pulsar systems [56] implies the Lorentz symmetry holds up to the level established by that limit. Let us now estimate the impact at low energy of the string interactions. For the most stringent experimental tests of the Lorentz invariance, the Hughes Drever tests, m l MeV ( p) and we see from (6) that Lorentz ....
J.F. Bell and T. Damour, Class. Quantum Gravity 13 (1996) 3121.
Supersymmetry and the Geometry of Taub-NUT - van Holten (1994) (Correct)
....the analysis presented below it is clear that the supersymmetric extension also considerably clarifies the structure of the purely bosonic theory. As such the method and ideas seem to be of more general relevance. Some results on spinning Taub NUT space of which we make use were obtained in refs. [13, 14, 15]. For the purpose of describing symmetries and conservation laws, the covariant Hamiltonian formalism introduced in [12, 16] is most useful. In this formalism the basic phase space variables are (x ; Pi ; a ) with Pi the covariant rather than the canonical momentum: Pi = p ....
.... corresponding Killing vectors: R 0 = 0; 0; 0; 1) R 1 = 0; Gamma sin ; Gamma cot cos ; csc cos ) R 2 = 0; cos ; Gamma cot sin ; csc sin ) R 3 = 0; 0; 1; 0) 9) Expressions for the extension of these constants of motion to spinning particles have been presented in [13, 14]. A fast method to obtain them is by the following theorem: If on a manifold with metric g there exists a Killing vector R , then the motion of a scalar particle on the manifold conserves the quantity J = R Pi ; 10) and the motion of a spinning particle with Lagrangian (1.1) ....
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M. Visinescu, Class. Quantum Gravity 11 (1994), 1867
Killing-Yano tensors and generalized supersymmetries in.. - van Holten (1994) (Correct)
.... reads L = ds d 2 ; 48) where the line element in spherical co ordinates is given by ds 2 = 1 Gamma 2 r h dr 2 r 2 i d 2 sin 2 dOE 2 ji 1 i 1 Gamma 2 r j [d cos dOE] 2 : 49) The supersymmetric extension of this Lagrangian was investigated in [17, 18]. The metric (49) admits four Killing vectors, which transform as a scalar and a vector under rotations; they represent the relative charge q and the total angular momentum J (which includes a contribution from the relative electric charge) As observed in [19] the Taub NUT geometry also ....
M. Visinescu, Class. Quantum Gravity 11 (1994), 1867
String Theory In Curved Space-Time - Viswanathan, Parthasarathy (1996) (Correct)
....in (2 1) gravity [13] 15] The considerations in this paper offer other possibilities for choosing hypersurfaces that extremize the extrinsic curvature action. 2 d surfaces of prescribed mean curvature are studied as solutions of the Einstein constraint equations on closed manifolds in [16] [17]. This paper is organized as follows. In section 0.2, we consider the classical properties of both the N G and the extrinsic curvature actions in a curved space time. We derive their equations of motion and discuss possible solutions. The space time energy momentum tensor T of the string is ....
J.Isenberg, Class.Quantum Gravity, 12, 2249 (1995).
Group theoretical derivation of Liouville action for Regge surfaces - Menotti (1997) (Correct)
....area i.e. the value of the area due to the oe 0 in the following decomposition of the conformal factor oe oe( oe 0 ( 0 ; oe 0 Gamma2 log j j for 1: 3) The last term in eq. 1) in important as it provides the correct transformation properties of the action under uniform rescaling [4]. In [2] the Liouville action has been derived for a two dimensional Regge surface, i.e. a surface which is everywhere flat except at isolated points where conical singularities are present; the result for spherical topology was S l = 26 12 8 : X i;j 6=i (1 Gamma ff i ) 1 Gamma ff j ) ff ....
M.J. Duff Class. Quantum Gravity 11 (1994) 1387; J.S. Dowker Class. Quantum Gravity 11 (1994) L7.
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