Abstract
In this short review, we outline three sets of developments in understanding heterotic string compactifications. First, we outline recent progress in heterotic analogues of quantum cohomology computations. Second, we discuss a potential swampland issue in heterotic strings, and new heterotic string constructions that can be used to fill in the naively missing theories. Third, we discuss recent developments in string compactifications on stacks and their applications, concluding with an outline of work-in-progress on heterotic string compactifications on gerbes.
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