Stringy Symmetries and Their High-energy Limits

Abstract

We derive stringy symmetries with conserved charges of arbitrarily high spins from the decoupling of two types of zero-norm states in the old covariant first quantized (OCFQ) spectrum of open bosonic string. These symmetries are valid to all energy and all loop orders in string perturbation theory. The high-energy limit of these stringy symmetries can then be used to fix the proportionality constants between scattering amplitudes of different string states algebraically without referring to Gross and Mende's saddle point calculation of high-energy string-loop amplitudes. These proportionality constants are, as conjectured by Gross, independent of the scattering angle and the order of string perturbation theory. However, we also discover some new nonzero components of high-energy amplitudes not found previously by Gross and Manes. These components are essential to preserve massive gauge invariances or decouple massive zero-norm states of string theory. A set of massive scattering amplitudes and their high energy limit are calculated explicitly to justify our results.

10 pages. A corrected version of hep-th/0303012. Final version to appear in Phys. Lett. B

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• Zero-norm states and High-energy Symmetries of String Theory
• Decoupling of Degenerate Positive-norm States in Witten's String Field Theory
• Heterotic massive Einstein-Yang-Mills-type symmetry and Ward identity
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