Causality and strict causality for symmetric bilinear systems
نویسندگان
چکیده
منابع مشابه
Causality and phase transitions in PT -symmetric optical systems
We discuss phase transitions in PT -symmetric optical systems. We show that, due to frequency dispersion of the dielectric permittivity, an optical system can have PT symmetry at isolated frequency points only. An assumption of the existence of a PT -symmetric system in a continuous frequency interval violates the causality principle. Therefore, the ideal symmetry-breaking transition cannot be ...
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ژورنال
عنوان ژورنال: Journal of Mathematical Analysis and Applications
سال: 1978
ISSN: 0022-247X
DOI: 10.1016/0022-247x(78)90173-7