2 papers
gr-qc2023
Fermat's Principle in General Relativity via Herglotz Variational Formalism
Joanna Piwnik, Joanna Gonera, Piotr Kosiński
New form of Fermat's principle for light propagation in arbitrary (i.e. in general neither static nor stationary) gravitational field is proposed. It is based on Herglotz extension…
quant-ph2023
Note on the Margolus-Levitin quantum speed limit for arbitrary fidelity
Krzysztof Andrzejewski, Katarzyna Bolonek-Lasoń, Piotr Kosiński
For vanishing fidelity between initial and final states two important quantum speed limits, the Mandelstam-Tamm limit (involving energy dispersion) and Margolus-Levitin one (involv…