Browsing Acta Polytechnica. 2017, vol. 57, no. 6 by Title
Now showing items 15-16 of 16
SIMPLE MODELS OF THREE COUPLED PT SYMMETRIC WAVE GUIDES ALLOWING FOR THIRDORDER EXCEPTIONAL POINTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)We study theoretical models of three coupled wave guides with a PT-symmetric distribution of gain and loss. A realistic matrix model is developed in terms of a three-mode expansion. By comparing with a previously postulated ...
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This paper is devoted to the study of images in N-point gravitational lenses by methods of algebraic geometry. In the beginning, we carefully define images in algebraic terms. Based on the definition, we show that in this ...