String-induced Yang-Mills coupling to self-dual gravity
Chandrashekar Devchand and Olaf Lechtenfeld
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Submission date: 27. Aug. 1998
published in: Nuclear Physics (Amsterdam) / B, 539 (1999) 1-2, p. 309-328
DOI number (of the published article): 10.1016/S0550-3213(98)00732-9
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By considering N=2 string amplitudes we determine the (2+2)-dimensional target space action for the physical degrees of freedom: self-dual gravity and self-dual Yang-Mills, together with their respective infinite towers of higher-spin inequivalent picture states. Novel `stringy' couplings amongst these fields are essential ingredients of an action principle for the effective target space field theory. We discuss the covariant description of this theory in terms of self-dual fields on a hyperspace parametrised by the target space coordinate and a commuting chiral spinor.