Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Completing $R^4$ using $O(d,d)$   The tree-level string effective action is known to contain quartic Riemann
terms with coefficient $\zeta(3)\alpha'^3$. In the case of the type II string
this is the first $\alpha'$ correction. We use the requirement that the action
reduced on a $d$-torus should have an $O(d,d)$ symmetry to find the B-field
couplings up to fifth order in fields. The answer turns out to have a
surprisingly intricate structure.

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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: cs
34
The categories of this paper are: chem-ph