Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-03-27
JHEP 0604:053,2006
Physics
High Energy Physics
High Energy Physics - Theory
26 pages, 5 figures
Scientific paper
10.1088/1126-6708/2006/04/053
We derive an analytic series solution of the elliptic equations providing the 4-tachyon off-shell amplitude in cubic string field theory (CSFT). From such a solution we compute the exact coefficient of the quartic effective action relevant for time dependent solutions and we derive the exact coefficient of the quartic tachyon coupling. The rolling tachyon solution expressed as a series of exponentials $e^t$ is studied both using level-truncation computations and the exact 4-tachyon amplitude. The results for the level truncated coefficients are shown to converge to those derived using the exact string amplitude. The agreement with previous work on the subject, both on the quartic tachyon coupling and on the CSFT rolling tachyon, is an excellent test for the accuracy of our off-shell solution.
Forini Valentina
Grignani Gianluca
Nardelli Giuseppe
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