Casimir Energy and Thermodynamic Properties of the Relativistic Piecewise Uniform String

Details Casimir Energy and Thermodynamic Properties of the Relativistic Piecewise Uniform String Casimir Energy and Thermodynamic Properties of the Relativistic Piecewise Uniform String

2000-02-08

arxiv.org/abs/hep-th/0002064v1

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, AMSTeX, no figures. To appear in the Proceedings of the Londrina Winter School. World Scientific, 2000

Scientific paper

The Casimir energy for the transverse oscillations of a piecewise uniform closed string is calculated. The great adaptibility of this string model with respect to various regularization methods is pointed out. We survey several regularization methods: the cutoff method, the complex contour integration method, and the zeta-function method. The most powerful method in the present case is the contour integration method. The Casimir energy turns out to be negative, and more so the larger is the number of pieces in the string. The thermodynamic free energy F is calculated for a two-piece string in the limit when the tension ratio x=T_{I}/T_{II} approaches zero.

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