Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strings on Eight-Orbifolds   We present several examples of T^8/P orbifolds with $P \subset SU(4)$. We
compute their Hodge numbers and consider turning on discrete torsion. We then
study supersymmetric compactifications of type II, heterotic, and type I
strings on these orbifolds. Heterotic compactifications to D=2 have a B-field
tadpole with coefficient given by that of the anomaly polynomial. In the SO(32)
heterotic with standard embedding the tadpole is absent provided the internal
space has a precise value of the Euler number. Guided by their relation to type
I, we find tadpole-free SO(32) heterotic orbifolds with non-standard embedding.

15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph