Variational Principles - On the Dangers and Ambushes Awaiting a Theoretical Physicist

This colloquium talk from the Warsaw colloquium for theoretical physics at CTP PAS explores the common errors physicists make when applying calculus of variations, with particular emphasis on how these mistakes can severely impact the correct description of gravitational phenomena. Discover the mathematical pitfalls and conceptual traps that theoretical physicists should avoid when working with variational principles. Presented by J. Kijowski at Centrum Fizyki Teoretycznej PAN (Center for Theoretical Physics of the Polish Academy of Sciences) on March 12, 2025, this 69-minute lecture provides valuable insights for physicists working in theoretical and gravitational physics.