The classical spectral curve of the lambda-deformed AdS5 x S5 superstring is constructed and identified with the semiclassical limit of XXZ-type Bethe ansatz equations for PSU(2,2|4).
Beta Function of k Deformed AdS_5 x S^5 String Theory
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We calculate the one loop beta function for the would-be marginal coupling on the world sheet of the k deformed sigma models associated to a quantum group with q=exp(i pi/k). This includes the bosonic principal chiral models and symmetric space sigma models but also the k deformed semi-symmetric space sigma model describing strings in a deformation of AdS_5 x S^5. The world sheet sigma model is a current-current deformation of the gauged WZW model for the supergroup PSU(2,2|4) with level k. In the string theory context the beta function is shown to vanish because of the vanishing of the Killing form of PSU(2,2|4) which is another piece of evidence that the k deformed theories define consistent string theories.
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Classical Spectral Curve of the AdS_5 x S^5 Lambda Superstring
The classical spectral curve of the lambda-deformed AdS5 x S5 superstring is constructed and identified with the semiclassical limit of XXZ-type Bethe ansatz equations for PSU(2,2|4).