Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-11-29
Adv.Theor.Math.Phys.10:433-501,2006
Physics
High Energy Physics
High Energy Physics - Theory
60 pages, 4 figures, v2: typos corrected, references added
Scientific paper
We propose a new basis in Witten's open string field theory, in which the star product simplifies considerably. For a convenient choice of gauge the classical string field equation of motion yields straightforwardly an exact analytic solution that represents the nonperturbative tachyon vacuum. The solution is given in terms of Bernoulli numbers and the equation of motion can be viewed as novel Euler--Ramanujan-type identity. It turns out that the solution is the Euler--Maclaurin asymptotic expansion of a sum over wedge states with certain insertions. This new form is fully regular from the point of view of level truncation. By computing the energy difference between the perturbative and nonperturbative vacua, we prove analytically Sen's first conjecture.
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