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Naked singularities in four-dimensional string backgrounds

Technical Report:

Abstract

It is shown that gauged nonlinear sigma models can be always deformed by terms proportional to the field strength of the gauge fields (nonminimal gauging). These deformations can be interpreted as perturbations, by marginal operators, of conformal coset models. When applied to the SL(2, R)xSU(2)/U(1)xU(1) WZWN model, a large class of four-dimensional curved spacetime backgrounds are obtained. In particular, a naked singularity may form at a time when the volume of the universe is different from zero. (orig.)
Authors:
Publication Date:
Apr 01, 1993
Product Type:
Technical Report
Report Number:
BONN-HE-93-11; HEP-TH-9304013
Reference Number:
SCA: 662110; PA: DEN-94:0F0655; EDB-94:027335; ERA-19:007572; NTS-94:015124; SN: 94001136102
Resource Relation:
Other Information: PBD: Apr 1993
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; SIGMA MODEL; GAUGE INVARIANCE; DEFORMATION; FOUR-DIMENSIONAL CALCULATIONS; NONLINEAR PROBLEMS; SINGULARITY; VECTOR FIELDS; UNIFIED GAUGE MODELS; STRING MODELS; SU-2 GROUPS; U-1 GROUPS; DISTURBANCES; CONFORMAL INVARIANCE; RIEMANN SPACE; SPACE-TIME; SL GROUPS; ACTION INTEGRAL; LAGRANGIAN FIELD THEORY; 662110; THEORY OF FIELDS AND STRINGS
OSTI ID:
10119759
Research Organizations:
Bonn Univ. (Germany). Physikalisches Inst.
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE94733996; TRN: DE94F0655
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
16 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Mohammedi, N. Naked singularities in four-dimensional string backgrounds. Germany: N. p., 1993. Web.
Mohammedi, N. Naked singularities in four-dimensional string backgrounds. Germany.
Mohammedi, N. 1993. "Naked singularities in four-dimensional string backgrounds." Germany.
@misc{etde_10119759,
title = {Naked singularities in four-dimensional string backgrounds}
author = {Mohammedi, N}
abstractNote = {It is shown that gauged nonlinear sigma models can be always deformed by terms proportional to the field strength of the gauge fields (nonminimal gauging). These deformations can be interpreted as perturbations, by marginal operators, of conformal coset models. When applied to the SL(2, R)xSU(2)/U(1)xU(1) WZWN model, a large class of four-dimensional curved spacetime backgrounds are obtained. In particular, a naked singularity may form at a time when the volume of the universe is different from zero. (orig.)}
place = {Germany}
year = {1993}
month = {Apr}
}