Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-02-24
Nucl.Phys. B670 (2003) 161-182
Physics
High Energy Physics
High Energy Physics - Theory
26 pages, 8 eps figures; minor corrections
Scientific paper
10.1016/j.nuclphysb.2003.08.007
We investigate a non-perturbative vacuum in open string field theory expanded around the analytic classical solution which has been found in the universal Fock space generated by matter Virasoro generators and ghost oscillators. We carry out level-truncation analyses up to level (6,18) in the theory around one-parameter families of the solution. We observe that the value of the vacuum energy cancels the D-brane tension as the approximation level is increased, but this non-perturbative vacuum disappears at the boundary of the parameter space. These results provide strong evidence for the conjecture that, although the universal solutions are pure gauge in almost all the parameter space, they are regarded as the tachyon vacuum solution at the boundary.
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