Comments on marginal deformations in open string field theory

In this short Letter we present a class of remarkably simple solutions to Witten's open string field theory that describe marginal deformations of the underlying boundary conformal field theory. The solutions we consider correspond to dimension-one matter primary operators that have non-singular operator products with themselves. We briefly discuss application to rolling tachyons. (c) 2007 Elsevier B.V. All rights reserved.