Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heterotic M(atrix) theory at generic points in Narain moduli space   Type II compactifications with varying string coupling can be described
elegantly in F-theory/M-theory as compactifications on U - manifolds. Using a
similar approach to describe Super Yang-Mills with a varying coupling constant,
we argue that at generic points in Narain moduli space, the $E_8 \times E_8$
Heterotic string compactified on $T^2$ is described in M(atrix) theory by N=4
SYM in 3+1 dimensions with base $S^1 \times CP^1$ and a holomorphically varying
coupling constant. The $CP^1$ is best described as the base of an elliptic K3
whose fibre is the complexified coupling constant of the Super Yang-Mills
theory leading to manifest U-duality. We also consider the cases of the
Heterotic string on $S^1$ and $T^3$. The twisted sector seems to (almost)
naturally appear at precisely those points where enhancement of gauge symmetry
is expected and need not be postulated. A unifying picture emerges in which the
U-manifolds which describe type II orientifolds (dual to the Heterotic string)
as M- or F- theory compactifications play a crucial role in Heterotic M(atrix)
theory compactifications.

15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an