Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extremal N=(2,2) 2D Conformal Field Theories and Constraints of
  Modularity   We explore the constraints on the spectrum of primary fields implied by
modularity of the elliptic genus of N=(2,2) 2D CFT's. We show that such
constraints have nontrivial implications for the existence of "extremal"
N=(2,2) conformal field theories. Applications to AdS3 supergravity and flux
compactifications are addressed.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
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The categories of this paper are: econ
25
The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con