Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A few Ricci-flat stacks as phases of exotic GLSM's   In this letter we follow up recent work of Halverson-Kumar-Morrison on some
exotic examples of gauged linear sigma models (GLSM's). Specifically, they
describe a set of U(1) x Z_2 GLSM's with superpotentials that are quadratic in
p fields, rather than linear as is typically the case. These theories RG flow
to sigma models on branched double covers, where the double cover is realized
via a Z_2 gerbe. For that gerbe structure, and hence the double cover, the Z_2
factor in the gauge group is essential. In this letter we propose an analogous
geometric understanding of phases without that Z_2, in terms of Ricci-flat (but
not Calabi-Yau) stacks which look like Fano manifolds with hypersurfaces of Z_2
orbifolds.

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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: physics