Systematics of string loop threshold corrections in orbifold models

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.2323· OSTI ID:538670

Chemtob, M ^[1]

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1. Service de Physique Theorique, CE-Saclay F-91191 Gif-sur-Yvette Cedex (France)

The string theory one-loop threshold corrections are studied in a background field approach due to Kiritsis and Kounnas which uses space-time curvature as an infrared regulator. We review the conformal field theory aspects of the method for the special case of the semiwormhole space-time solution. The comparison between the string and effective field theories vacuum functionals is made for the low-derivative order, as well as for certain higher-derivative, gauge and gravitational interactions. We study the dependence of string loop renormalization corrections on the infrared cutoff. Numerical applications are considered for a sample of four-dimensional Abelian orbifold models with a view to deduce the systematic trends of the moduli-independent threshold corrections. The implications on the perturbative string theory unification are examined. We present numerical results for the gauge interactions coupling constants as well as for the quadratic order gravitational (R{sup 2}) and the quartic order gauge (F{sup 4}) interactions. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538670
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 4 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CONFORMAL INVARIANCE
CORRECTIONS
COUPLING CONSTANTS
GRAVITATIONAL INTERACTIONS
NUMERICAL ANALYSIS
PERTURBATION THEORY
QUANTUM FIELD THEORY
QUANTUM GRAVITY
RENORMALIZATION
SPACE-TIME
STRING MODELS