Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-09-25
JHEP 0201 (2002) 032
Physics
High Energy Physics
High Energy Physics - Theory
11 pages, LaTeX; a reference added
Scientific paper
10.1088/1126-6708/2002/01/032
We argue that there are two distinct classes of type I compactification to four dimensions on any space. These two classes are distinguished in a mysterious way by the presence (or absence) of a discrete 6-form potential. In simple examples, duality suggests that the new class of compactifications have reduced numbers of moduli. We also point out analogous discrete choices in M, F and type II compactifications, including some with $G_2$ holonomy. These choices often result in spaces with frozen singularities.
Morrison David R.
Sethi Savdeep
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