Open-string effective actions
The effective actions for various modes of open bosonic and superstrings are investigated. Consistent equations of motion for spin-1 fields (both neutral and charged) are derived from the bosonic string in a background field using BRST invariance. These equations are linear in the propagating field and exact in the background field, and come from gauge symmetry breaking of an underlying non-abelian generalization of the Born-Infeld lagrangian. The terms to order (a{prime}){sup 4} of this lagrangian are determined from the linearized string equations. The field equations and the lagrangian for the spin-2 massive bosonic string states in an abelian electromagnetic background are also derived. Their construction provides a generalization of the free Fierz-Pauli lagrangian. The Fischler-Susskind mechanism in the operator formalism is described for closed bosonic string tadpoles, and for superstring amplitudes factorizing at a spin node. Terms in the equations of motion for the massless antisymmetric tensor field of the type I superstring are derived using this framework. In particular, the requirement of BRST invariance for the sum of sphere, disk, and crosscap amplitudes is used to determine coefficients of anomaly-cancelling terms in the effective action in agreement with the predictions of the Green-Schwarz anomaly-cancellation mechanism.
- Research Organization:
- Princeton Univ., NJ (United States)
- OSTI ID:
- 5178378
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPOSITE MODELS
DIFFERENTIAL EQUATIONS
EQUATIONS
EQUATIONS OF MOTION
EXTENDED PARTICLE MODEL
FIELD EQUATIONS
FIELD THEORIES
INVARIANCE PRINCIPLES
LAGRANGIAN FIELD THEORY
MATHEMATICAL MODELS
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE MODELS
QUANTUM FIELD THEORY
QUARK MODEL
STRING MODELS
SUPERSYMMETRY
SYMMETRY
SYMMETRY BREAKING