Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On topological F-theory   We consider the construction of a topological version of F-theory on a
particular $Spin(7)$ 8-manifold which is a Calabi-Yau 3-fold times a 2-torus.
We write an action for this theory in eight dimensions and reduce it to lower
dimensions using Hitchin's gradient flow method. A symmetry of the
eight-dimensional theory which follows from modular transformations of the
torus induces duality transformations of the variables of the topological A-
and B-models. We also consider target space form actions in the presence of
background fluxes in six dimensions.

28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga