Department of Physics Papers

Document Type

Journal Article

Date of this Version

2-1989

Publication Source

Physical Review Letters

Volume

62

Start Page

993

Last Page

996

DOI

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.

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Date Posted: 01 May 2017

This document has been peer reviewed.