About a class of exact string backgrounds.

Details About a class of exact string backgrounds. About a class of exact string backgrounds.

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nuphb.455..188b&link_type=abstract

Nuclear Physics B, Vol. B455, No. 1 - 2, p. 188 - 210

Physics

Nuclear Physics

48

Black Holes: String Theory

Scientific paper

The author investigates a class of string backgrounds which have one conserved chiral null current on the world sheet. In the target space they have a null Killing vector and unbroken supersymmetries. This class also known as the chiral null model is a generalization of the gravitational wave and fundamental string background and is exact in the α' expansion. The reduction to 4 dimensions yields a stationary IWP solution which couples to 7 gauge fields and 4 scalars. Special cases are the Taub-NUT geometry and rotating black holes. These solutions possess a T-self-dual point where the black hole becomes massless. Discussing the S-duality the author shows that the Taub-NUT geometry allows an S-self-dual point and that the electric black hole corresponds to a magnetic black hole or an H-monopole. He could identify the massless black hole as NL = 0 and confirms the H-monopole as an NL = 1 string state.

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