The Tale of Gravitational Sphaleron
نویسنده
چکیده
Type I string theory can be dimensionally reduced on group manifolds. The compactification on S × S leads to the N=4 gauged SU(2)×SU(2) supergravity in four dimensions, which admits the BPS monopole type nonAbelian vacuum. The reduction on S × AdS3 gives the Euclidean N=4 gauged SU(2)×SU(1,1) supergravity admitting a globally regular supersymmetric non-Abelian background. The latter can be analytically continued to the Lorentzian sector, which gives the regular, unstable particle-like configuration known as gravitational sphaleron. When lifted to D=10, the Euclidean vacuum describes a deformation of the D1–D5 brane system.
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