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

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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 S³ 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=13/7 theory on the other hand describes a cosmological solution that interpolates between a singular phase at short times and a S¹ × S² universe after some planckian times.