Exact monopole instantons and cosmological solutions in string theory from abelian dimensional reduction

Abstract

We compute the exact string vacuum backgrounds corresponding to the non-compact coset theory $SU(2,1)/SU(2)$. The conformal field theory defined by the level $k=4$ results in a five dimensional singular solution that factorizes in an asymptotic region as the linear dilaton solution and a $S^3$ model. It presents two abelian compact isometries that allow to reinterpreting it from a four dimensional point of view as a stationary and magnetically charged space-time resembling in some aspects the Kerr-Newman solution of general relativity. The $k=\frac{13}{7}$ theory on the other hand describes a cosmological solution that interpolates between a singular phase at short times and a $S^1\times S^2$ universe after some planckian times.

18 pages, section 5 replaced by 5 and 6, references added; to appear in Phys. Rev. D

References in corpus (4)

• Heterotic Coset Models and (0,2) String Vacua
• Strings from $N=2$ Gauged Wess-Zumino-Witten Models
• Gravitational instantons and black plane solutions in 4-d string theory
• Gauging Wess-Zumino-Witten Models

Cited by in corpus (4)

• High spin limits and non-abelian T-duality
• Solving field equations in non-isometric coset CFT backgrounds
• Non-Abelian coset string backgrounds from asymptotic and initial data
• SO(3) \times U(1) isometric instantons with non abelian hair in four dimensional string theory