TY - GEN AU - Basdevant,Jean-Louis TI - Variational principles in physics SN - 9783031216916 U1 - 530.1 23 PY - 2023/// CY - Switzerland PB - Springer Nature KW - Physics N1 - Includes bibliography and index; Structure of physical theories -- Variational principles -- The Analytical mechanics of Lagrange -- Hamilton's canonical formalism -- Action optics Hamilton-Jacobi equation -- Lagrangian field theory -- Motion in a curved space -- Gravitational waves -- Feynman's path integrals in quantum mechanics -- Solutions of the problems and exercises N2 - This revised and enhanced new edition of a well-established textbook provides a balanced overview of various areas of theoretical physics based on the use of variational principles. As well as field theory, the book deals with motion in curved spaces, the cradle of general relativity, and gravitational optics. New chapters on the relation of classical mechanics and geometrical optics as well as gravitational waves, which are considered as a true confirmation of general relativity, have been included. Each chapter has been carefully revised and enlarged. Finally, the text describes Feynman's formulation of quantum mechanics by path integrals, which gives the link between quantum and classical mechanics ER -