D-branes as coherent states in the open string channel

Understand

We show that bosonic D-brane states may be represented as coherent states in an open string representation.

• By using the Thermo-Field Dynamics (TFD) formalism, we may construct a condensed state of open string modes which encodes the information on the D-brane configuration.
• We also introduce a construction alternative to TFD, which does not requires to assume thermal equilibrium.
• It is shown that the dynamics of the system combined with geometric properties of the duplication rules of TFD is sufficient to obtain the thermal states and their analytic continuations in a geometric fashion.