Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vertex operators of ghost number three in Type IIB supergravity   We study the cohomology of the massless BRST complex of the Type IIB pure
spinor superstring in flat space. In particular, we find that the cohomology at
the ghost number three is nontrivial and transforms in the same representation
of the supersymmetry algebra as the solutions of the linearized classical
supergravity equations. Modulo some finite dimensional spaces, the ghost number
three cohomology is the same as the ghost number two cohomology. We also
comment on the difference between the naive and semi-relative cohomology, and
the role of b-ghost.

9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
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The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int