Signs of Schwinger term and operator ordering [PDF]
J. S. BhattacharyyaWe consider central extensions of 1+1 dimensional abelian current algebra and Virasoro algebra and see that the sign of the Schwinger terms depend on the ordering of the operators in the current - current commutators. Possible consequences for a string theory are mentioned briefly.View original: http://arxiv.org/abs/1302.7086
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