## Search

Now showing items 1-10 of 29

#### Extended conformal symmetries and U(1) currents

(1989)

The authors investigate the structure of extended conformal algebras generated by local chiral fields of spin 1,2,. . .,n using the Gelfand-Dickey algebra of formal pseudodifferential operators for the gl(n) algebra. The ...

#### Quantum mechanics of non-linear systems

(1987)

A generalisation of Weyl's correspondence rule and the associated Moyal bracket for systems with non-linear phase spaces that admit symplectic transitive group actions is presented. This provides a simple account with ...

#### Virasoro algebra anomalies and deformations

(1987)

The authors relate the anomalies of string theories to the mathematical obstructions of Dirac's canonical quantisation. The cohomological features of the deformation approach to the quantisation procedure determine the ...

#### Using a relational database as an index to a distributed object database in engineering design systems

(1989)

A pragmatic architecture for engineering design systems is described which divides the databases of those systems into a relational database and an object oriented database. The former is used to find objects in the object ...

#### Using a relational database as an index to a distributed object database in engineering design systems

(Publ by IEEE, 1989)

A description is given of a pragmatic architecture for engineering design systems that divides the databases of those systems into a relational database and an object-oriented database. In the architecture, the relational ...

#### EVALUATING RECURSIVE QUERIES IN CAD USING AN EXTENDED PROJECTION FUNCTION.

(IEEE, 1987)

Entities such as mechanical assemblies are recursive when they contain other assemblies at a lower level of detail. The authors show how recursive CAD entities can be manipulated using an extended projection function. The ...

#### A group theoretical approach to the canonical quantisation of gravity. II. Unitary representations of the canonical group

(1984)

For pt.I see ibid., vol.1, p.621-32, 1984. Unitary representations of the canonical group C for quantum gravity, discussed in an earlier paper, are studied producing concrete operator realisations of the basic canonical ...

#### Matter fields in the strong-coupling limit of quantum gravity

(1989)

The coupling of matter fields to a quantised gravitational field in the strong-coupling limit (GN to infinity ) of gravity is studied. A generalised form of affine commutation relations is proposed and their ultralocal ...

#### A group theoretical approach to the canonical quantisation of gravity. I. Construction of the canonical group

(1984)

An approach to quantisation in terms of a transitive group of symplectic transformations of the classical phase space is discussed. This is applied to general relativity where the phase space is nonlinear and it is shown ...

#### Spin-4 extended conformal algebras

(1988)

We construct spin-4 extended conformal algebras using the second hamiltonian structure of the KdV hierarchy. In the presence of a U(1) current a family of spin-4 algebras exists but the additional requirement that the ...