One-loop string amplitudes on orbifold compactifications

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5123445

Minahan, J A

This thesis is divided into two parts. In the first chapter we consider three-point one-loop amplitudes for strings propagating on orbifolds that preserve a supersymmetry. For three external gauge bosons, we compute the explicit wave function renormalization of the external legs and show that it leads to the correct value for the Yang-Mills {beta}-function. For two gauge bosons and a graviton, we show that there is no renormalization of the coupling. In the second chapter we consider propagation of Type I SO(32) superstrings on orbifolds. It is shown that anomaly cancellation requires the existence of twisted open string and we determine the Chan-Paton factors for these strings for the example of a Z{sub 2} orbifold. However, even though the low energy anomalies can be canceled, there are nonphysical states that are absorbed by the vacuum in the one-loop vacuum amplitudes.

• Research Organization: Princeton Univ., NJ (USA)
• OSTI ID: 5123445
• Country of Publication: United States
• Language: English

Related Subjects

645000* -- High Energy Physics
645200 -- High Energy Physics-- Particle Interactions & Properties-Theoretical
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CALCULATION METHODS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
GRAVITATIONAL RADIATION
GRAVITONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
QUARK MODEL
RADIATIONS
STRING MODELS
SUPERSYMMETRY
SYMMETRY