/ 94 04 01 8 v 1 5 A pr 1 99 4 The Nappi - Witten example and gravitational waves
نویسندگان
چکیده
The vanishing of the anomaly in the recent example of Nappi and Witten, constructed from the Wess-Zumino-Witten model based on a certain non-semisimple group, follows from a more general result valid for gravitational waves. The construction of the metric is explained.
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