We present and discuss a Euclidean solution of the low-energy effective string action that can be interpreted as a semiclassical decay process of the ground state of the theory.
M. Cadoni and M. Cavaglia, "Instability of the R3xS1 Vacuum in Low-Energy Effective String Theory," Physical Review D, vol. 52, no. 4, pp. 2583-2586, American Physical Society (APS), Aug 1995.
The definitive version is available at https://doi.org/10.1103/PhysRevD.52.2583
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