Calabi-Yau Duals for CHL Strings
نویسنده
چکیده
We find M-theory (Type IIA) duals for compactifications of the 9d CHL string to 5d (4d) on K3 (K3 × S 1). The IIA duals are Calabi-Yau orbifolds with nontrivial RR U (1) In ten dimensions, the consistent critical string theories with (at least) sixteen super-charges have been known since the 1980s. There are (after accounting for the S-duality of the two SO(32) theories) four. In D = 9, in addition to the compactifications of the D = 10 theories on S 1 we find a new theory with 16 supercharges – the CHL string
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