7 papers · 1 filter
Gravity on and flat connections in the boundary CFT
Samir D. Mathur
We consider the CFT that arises from the D1-D5 system in the presence of a constant background gauge potential which couples to the R-charge of the theory: this potential effective…
Absorption of partial waves by three-branes
Samir D. Mathur, Alec Matusis
We study the absorption of a class of fields in the geometry produced by extremal three-branes. We consider fields that do not mix with the ten-dimensional graviton. For these fiel…
Non-BPS excitations of D-branes and Black holes
Samir D. Mathur
This note discusses some results on the non-BPS excitations of D-branes. We show that the excitation spectrum of a bound state of D-strings changes character when the length of the…
Real Time Propagator in the First Quantised Formalism
Samir D. Mathur
We argue that a basic modification must be made to the first quantised formalism of string theory if the physics of `particle creation' is to be correctly described. The analogous…
Information Retrieval from a Charge `Trap'
Samir D. Mathur
We study the model of massless electrodynamics with nonconstant coupling, introduced by Peet, Susskind and Thorlacius as the `charge hole'. But we take the boundary of the st…
Is the Polyakov path integral prescription too restrictive?
Samir D. Mathur
In the first quantised description of strings, we integrate over target space co-ordinates and world sheet metrics . Such path integrals give scattering amplitudes be…