Results 1 - 10 of 1867
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[en] The Casimir energy in the rigid string with massive ends is investigated. The string stiffness and quark mass give additive contributions to the Casimir energy, the second contribution being the same as in the Nambu-Goto string with massive ends. The string stiffness results in an additional positive contribution to the Casimer energy; however, it alone does not compensate the negative Casimer energy in the Nambu-Goto string. Only combined treatment of the string thickness and the quark mass enables one to obtain a positive Casimer energy, i.e., to remove the tachyon from the string spectrum. 14 refs., 1 fig
[en] Based on a generalization of the Lifshiftz theory, we calculate Casimir forces involving magnetodielectric and possibly anisotropic metamaterials, focusing on the possibility of repulsive forces. It is found that Casimir repulsion decreases with magnetic dissipation, and even a small Drude background in metallic-based metamaterials acts to make attractive a Casimir force that would otherwise be predicted to be repulsive. The sign of the force also depends sensitively on the degree of optical anisotropy of the metamaterial and on the form of the frequency dependency of the magnetic response
[en] We calculate the Casimir force at a finite cut-off Λ by summing the forces induced by the all fluctuation modes. We show that the Casimir force is independent of the cut-off function in the limit LΛ → ∞. There is a correction in the order of (LΛ)-2, when LΛ is finite and large. This correction becomes remarkable when L is comparable with the microscopic length scale Λ-1. It has been demonstrated that the Casimir force at a finite cut-off should be defined by summing forces of all fluctuation modes, instead of the derivative of Casimir energy with respect to L where an additional derivative of the cut-off function has been introduced
[en] We investigate the process of Casimir field indirect pliotodetection. The protocol of measurement is implemented via interaction between two-level atom and cavity. We evaluated basic statistical characteristics of conditional state of Casimir field. (paper)
[en] This is a brief review of different aspects of the so-called dynamical Casimir effect and the proposals aimed at its possible experimental realizations. A rough classification of these proposals is given and important theoretical problems are pointed out.
[en] The representation of the Casimir energy in terms of Lippmann-Schwinger operators in the TGTG formula is a convenient way to address both quantitative and qualitative aspects of the Casimir force. Since this form of the energy is already explicitly regularized it may be used in order to prove statements about the force. In addition, combined with approximations of the T operators involved, it allows for convergent asymptotic expressions for the force between bodies.
[en] We discuss the one loop matching procedure in ZQCD. Universality and Casimir scaling leave - in terms of the 't Hooft coupling - just two combinations of parameters to be fixed numerically. These numbers are then the same for any number of colours.