Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bose-Fermi Degeneracy and Duality in Non-Supersymmetric Strings   Following Kachru, Kumar and Silverstein, we construct a set of
non-supersymmetric Type II string models which have equal numbers of bosons and
fermions at each mass level. The models are asymmetric {\bf Z}_2 \otimes {\bf
Z}_2^{\prime} orbifolds. We demonstrate that this bose-fermi degeneracy feature
implies that both the one-loop and the two-loop contributions to the
cosmological constant vanish. We conjecture that the cosmological constant
actually vanishes to all loops. We construct a strong-weak dual pair of models,
both of which have bose-fermi degeneracy. This implies that at least some of
the non-perturbative corrections to the cosmological constant are absent.

37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
16
The categories of this paper are: stat
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc