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Repulsive Casimir Force in a Cavity with Coupling Loss at Finite Temperature

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Abstract

The Casimir force and Casimir entropy between boundary walls in a one-dimensional cavity with one-side coupling loss at finite temperature are investigated. By using the techniques of thermal field dynamics, we obtain the analysis expressions of the Casimir force and Casimir entropy at finite temperature. We find that the Casimir force at nonzero temperature is always repulsive and the Casimir entropy is always negative. The effects of temperature and the cavity loss on the Casimir force and Casimir entropy are also discussed in detail, respectively.

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Acknowledgments

This work was supported by China National Natural Science Foundation (Grants No. 11547242, 11175044, 11105021, and 11204028), the Natural Science Foundation of Jilin Province, China (Grant No. JJKH20181088KJ and 201115007), and the Foundation of Changchun University of Science and Technology (Grant No. XQNJJ-2015-04).

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Correspondence to H. Yang.

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Yang, H., Yuan, H.M., Zheng, T.Y. et al. Repulsive Casimir Force in a Cavity with Coupling Loss at Finite Temperature. Int J Theor Phys 59, 1838–1843 (2020). https://doi.org/10.1007/s10773-020-04450-z

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  • DOI: https://doi.org/10.1007/s10773-020-04450-z

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