Non-tachyonic open descendants of the 0B string theory

Abstract

We use the crosscap constraint to construct open descendants of the 0B string compactified on $T^6/Z_3$ and on $T^4/Z_2$ free of tachyons both in the closed and in the open unoriented sectors. In four dimensions the construction results in a Chan-Paton gauge group $U(8)\otimes U(12)\otimes U(12)$ with three generations of chiral fermions in the representations $(\overline{8},1,\overline{12})+(8,12,1)+(1,\overline{66},1)+(1,1,66)$.

13 pages, Latex. Minor corrections. Final version to appear on Phys.Lett.B

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