TFD Approach to Bosonic Strings and $D_P$-branes

Abstract

In this work we explain the construction of the thermal vacuum for the bosonic string, as well that of the thermal boundary state interpreted as a $D_p$-brane at finite temperature. In both case we calculate the respective entropy using the entropy operator of the Thermo Field Dynamics Theory. We show that the contribution of the thermal string entropy is explicitly present in the $D_p$-brane entropy. Furthermore, we show that the Thermo Field approach is suitable to introduce temperature in boundary states.

6 pages, revtex, typos are corrected. Prepared for the Second Londrina Winter School-Mathematical Methods in Physics, August 25-30, 2002, Londrina-Pr, Brazil. To appear in a special issue of IJMPA

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Cited by in corpus (16)

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• D-branes as coherent states in the open string channel
• String Entanglement and D-branes as Pure States
• General Unitary SU(1,1) TFD Formulation
• Noncommutative Thermofield Dynamics
• On the entropy operator for the general SU(1,1) TFD formulation
• Thermal $D$-Brane Boundary States from Green-Schwarz Superstrings
• String in AdS Black Hole: A Thermo Field Dynamic Approach
• Thermal D-brane boundary states from type IIB Green-Schwarz superstring in pp-wave background
• TFD Extension of Open String Field Theory
• Nonequilibrium dynamics of strings in time-dependent plane wave backgrounds
• Thermal magnetized D-branes on $R^{1,p}\times T^{d-p-1}$ in the generalized Thermo Field Dynamics approach
• First Order Semiclassical Thermal String in the AdS Spacetime
• Thermodynamics and Tachyon Condensation of the Dressed-Dynamical Unstable D$p$-branes