Vanishing of the conformal anomaly for strings in a gravitational wave

Abstract

Using the non-symmetric-connection approach proposed by Osborn, we demonstrate that, for a bosonic string in a specially chosen plane-fronted gravitational wave and an axion background, the conformal anomaly vanishes at the two-loop level. Under some conditions, the anomaly vanishes at all orders.

arXiv commentPreviously not available in hep-th. Published as Physics Letters B 313, 10 (1993). Plain TeX 6 pages. No figures

References in corpus (3)

• Celestial Mechanics, Conformal Structures, and Gravitational Waves
• String vacuum backgrounds with covariantly constant null Killing vector and 2d quantum gravity
• A class of finite two - dimensional sigma models and string vacua

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