Tachyon potentials, star products and universality

  title={Tachyon potentials, star products and universality},
  author={Leonardo Rastelli and Barton Zwiebach},
  journal={Journal of High Energy Physics},
We develop an efficient recursive method to evaluate the tachyon potential using the relevant universal subalgebra of the open string star algebra. This method, using off-shell versions of Virasoro Ward identities, avoids explicit computation of conformal transformations of operators and does not require a choice of background. We illustrate the procedure with a pedagogic computation of the level six tachyon potential in an arbitrary gauge, and the evaluation of a few simple star products. We… 

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