Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-11-14
Adv.Theor.Math.Phys.6:403-456,2003
Physics
High Energy Physics
High Energy Physics - Theory
50 pages, LaTeX, 4 figures
Scientific paper
We complete the construction of vacuum string field theory by proposing a canonical choice of ghost kinetic term -- a local insertion of the ghost field at the string midpoint with an infinite normalization. This choice, supported by level expansion studies in the Siegel gauge, allows a simple analytic treatment of the ghost sector of the string field equations. As a result, solutions are just projectors, such as the sliver, of an auxiliary CFT built by combining the matter part with a twisted version of the ghost conformal theory. Level expansion experiments lead to surprising new projectors -- butterfly surface states, whose analytical expressions are obtained. With the help of a suitable open-closed string vertex we define open-string gauge invariant operators parametrized by on-shell closed string states. We use regulated vacuum string field theory to sketch how pure closed string amplitudes on surfaces without boundaries arise as correlators of such gauge invariant operators.
Gaiotto Davide
Rastelli Leonardo
Sen Ashoke
Zwiebach Barton
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