Concept

Classical unified field theories

Publications associées (24)

Anomalies in orbifold field theories

We study the constraints on models with extra dimensions arising from local anomaly cancellation. We consider a five-dimensional field theory with a U(I) gauge field and a charged fermion, compactified on the orbifold S-1/(Z(2) x Z(2)'). We show that, even ...

2002

Nonlocal symmetry breaking in Kaluza-Klein theories

Claudio Scrucca

Scherk-Schwarz gauge symmetry breaking of a D-dimensional field theory model compactified on a circle is analyzed. It is explicitly shown that forbidden couplings in the,unbroken theory appear in the one-loop effective action only in a nonlocal way, implyi ...

2001

Indefinite-quadratic estimation and control: a unified approach to H 2 and H∞ theories

Ali H. Sayed

This monograph presents a unified mathematical framework for a wide range of problems in estimation and control. The authors discuss the two most commonly used methodologies: the stochastic H2 approach and the deterministic (worst-case) H approach. Despite ...

Society for Industrial and Applied Mathematics1999

Fully unconstrained approach to noncollinear magnetism: Application to small Fe clusters

Alfredo Pasquarello, Roberto Car

We develop a plane-wave pseudopotential scheme for noncollinear magnetic structures, based on a generalized local spin-density theory in which the direction of the magnetization is a continuous variable of position. We allow the atomic and magnetic structu ...

1998

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