On the SU (1, 1) Thermal Group of Bosonic Strings and D-Branes
نویسندگان
چکیده
All possible Bogoliubov operators that generate the thermal transformations in Thermo Field Dynamics (TFD) form a SU (1, 1) group. We discuss this construction in the bosonic string theory. In particular, the transformation of the Fock space and string operators generated by the most general SU(1, 1) unitary Bogoliubov transformation and the entropy of the corresponding thermal string are computed. Also, we construct the thermal D-brane generated by the SU(1, 1) transformation in a constant Kalb-Ramond field and compute its entropy.
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