Covariant insertion of general vertex operators
- 27 February 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 62 (9), 993-996
- https://doi.org/10.1103/physrevlett.62.993
Abstract
We provide a very simple prescription for inserting an arbitrary state into a string amplitude. The corresponding string measure is defined without any additional information whenever the state is Becchi-Rouet-Stora-Tyutin (BRST) invariant, generalizing the usual physical conditions. In particular no world-sheet metric is needed. We recover and interpret in a simple way the b^ prescription of Polchinski and explain geometrically how it secures the decoupling of BRST spurious states.Keywords
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