TFD Approach to Bosonic Strings and $D_{P}$-branes

Details TFD Approach to Bosonic Strings and $D_{P}$-branes TFD Approach to Bosonic Strings and $D_{P}$-branes

2003-01-30

arxiv.org/abs/hep-th/0301249v2

Int.J.Mod.Phys. A18 (2003) 2109-2118

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, revtex, typos are corrected. Prepared for the Second Londrina Winter School-Mathematical Methods in Physics, August 2

Scientific paper

10.1142/S0217751X03015556

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.

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