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  • Ashoke Sen
  • Physics
  • 2002 (First Publication: 22 March 2002)
  • We discuss construction of classical time dependent solutions in open string (field) theory, describing the motion of the tachyon on unstable D-branes. Despite the fact that the string field theoryContinue Reading
  • Ashoke Sen
  • Physics
  • 1996 (First Publication: 22 May 1996)
  • By analyzing F-theory on K3 near the orbifold limit of K3 we establish the equivalence between F-theory on K3 and an orientifold of type IIB on T2, which in turn is related by a T-dualityContinue Reading
  • Ashoke Sen
  • Physics
  • 1999 (First Publication: 16 November 1999)
  • Using string field theory, we argue that the tachyon potential on a D-brane in bosonic string theory in arbitrary background has a universal form, independent of the boundary conformal field theoryContinue Reading
  • Ashoke Sen
  • Physics
  • 2005 (First Publication: 11 October 2004)
  • In this review we describe our current understanding of the properties of open string tachyons on an unstable D-brane or brane–antibrane system in string theory. The various string theoretic methodsContinue Reading
  • Ashoke Sen
  • Physics
  • 1999 (First Publication: 15 February 1999)
  • We show that the tachyonic kink solution on a pair of D-p-branes in the bosonic string theory can be identified with the D-(p-1)-brane of the same theory. We also speculate on the possibility ofContinue Reading
  • Ashoke Sen
  • Physics
  • 2002 (First Publication: 28 March 2002)
  • It is shown that classical decay of unstable D-branes in bosonic and superstring theories produces pressureless gas with non-zero energy density. The energy density is stored in the open stringContinue Reading