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We show how to obtain loop-corrected effective field equations in tachyon-free heterotic string theories. The corrections are automatically gauge-invariant; they simultaneously secure Brst-decoupling and unambiguous loop amplitudes. We introduce a cutoff for two-dimensional field theory which is more general than the choice of a world-sheet metric, and using this we give an invariant description of factorization of fermionic amplitudes. As an example we work out the linearized corrections for the O(16) × O(16) heterotic string. They come from a finite corrected effective action.
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La, H., & Nelson, P. C. (1990). Effective Field Equations for Fermionic Strings. Nuclear Physics, 332 (1), 83-130. http://dx.doi.org/10.1016/0550-3213(90)90031-8
Date Posted: 01 May 2017
This document has been peer reviewed.