On the spectrum, no ghost theorem and modular invariance of $W_3$ strings

Details On the spectrum, no ghost theorem and modular invariance of $W_3$ strings On the spectrum, no ghost theorem and modular invariance of $W_3$ strings

1992-12-02

arxiv.org/abs/hep-th/9212016v1

Int.J.Mod.Phys. A8 (1993) 2875-2894

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, KCL-TH-92-7

Scientific paper

A spectrum generating algebra is constructed and used to find all the physical states of the $W_3$ string with standard ghost number. These states are shown to have positive norm and their partition function is found to involve the Ising model characters corresponding to the weights 0 and 1/16. The theory is found to be modular invariant if , in addition, one includes states that correspond to the Ising character of weight 1/2. It is shown that these additional states are indeed contained in the cohomology of $Q$.

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