On the entropy operator for the general SU(1,1) TFD formulation

Details On the entropy operator for the general SU(1,1) TFD formulation On the entropy operator for the general SU(1,1) TFD formulation

2004-09-10

arxiv.org/abs/hep-th/0409116v3

Phys.Lett. A334 (2005) 123-131

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, revtex4, minor typos corrected, references added

Scientific paper

10.1016/j.physleta.2004.11.025

In this letter, an entropy operator for the general unitary SU(1,1) TFD formulation is proposed and used to lead a bosonic system from zero to finite temperature. Namely, considering the closed bosonic string as the target system, the entropy operator is used to construct the thermal vacuum. The behaviour of such a state under the breve conjugation rules is analized and it was shown that the breve conjugation does not affect thermal effects. From this thermal vacuum the thermal energy, the entropy and the free energy of the closed bosonic string are calculated and the apropriated thermal distribution for the system is found after the free energy minimization.

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