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In this talka Ipresent several interesting aspects of dynamical tachyon condenser tion. Firstly, I demonstrate how under the rolling tachyon background the physical open string degrees of freedom exhibit Carrollian behavior and cease to propagate. Second, I present effective actions of Spacelike branes (S-branes). It turns out that they are quite usefu1 for describing formation of fundamental strings and lowerdimensional D-branes in dynamical tachyon condensation. a This talk is based on thedoi:10.24532/soken.107.6_f37 fatcat:inn3r4hijnfqtidcwvs3dfrg2q