Marginally Deformed Rolling Tachyon around the Tachyon Vacuum in Open String Field Theory

Understand

We investigate the string field theory around the tachyon vacuum.

• A pure gauge form of the solution is constructed at the tachyon vacuum.
• For a special choice of the gauge function for the pure gauge form, marginal deformation from the tachyon vacuum is allowed due to the nontrivial roles of Schnabl's analytic vacuum solution.
• We obtain an exact rolling tachyon solution which describes the late time behaviors of D-brane decay.