All Conformal Effective String Theories are Isospectral to Nambu-Goto Theory

Abstract

It is shown that all Polchinski-Strominger effective string theories are \emph{isospectral} to Nambu-Goto theory. The relevance of these results to QCD-Strings is discussed.

Comments: 4 pages in REVTEX. Various typos fixed, the abstract and discussions modestly enlarged and presentation improved in v2