Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum vacuum effects for a massive Bosonic string in background
  B-field   We study the Casimir effect for a bosonic string extended between D-branes,
and living in a flat space with an antisymmetric background B-field. We find
the Casimir energy as a function of theB-field, and the mass-parameter of the
string, and accordingly we obtain a B-dependence correction term to the
ground-state mass of the string. We show that for sufficiently large B-field,
the ground state of the string contains real (i.e. non-Tachyonic) particles.

36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom