Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Langlands duality and G2 spectral curves   We first demonstrate how duality for the fibres of the so-called Hitchin
fibration works for the Langlands dual groups Sp(2m) and SO(2m+1). We then show
that duality for G2 is implemented by an involution on the base space which
takes one fibre to its dual. A formula for the natural cubic form is given and
shown to be invariant under the involution.

33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph