Stringy Cosmic Strings and Axion Cohomology

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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22 pages (plain TeX), UMN-TH-1024/92

Scientific paper

10.1103/PhysRevD.47.2403

The static stationary axially symmetric background ("infinite cosmic string") of the $D=4$ string theory provided with an axion charge is studied in the effective theory approach. The most general exact solution is constructed. It is found that the Kalb-Ramond axion charge, present in the string topology $R^{3} \times S^{1}$, produces nontrivial gravitational field configurations which feature horizons. The corresponding ``no-hair'' theorems are proved which stress uniqueness of black strings. Connection of the solutions with the gauged WZWN sigma model constructions on the world sheet is discussed since they are the only target spaces which hide their singularities behind horizons, and thus obey the cosmic censorship conjecture.

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