Variational Principles in Physics

  • Jean-Louis Basdevant

Table of contents

  1. Front Matter
    Pages i-x
  2. Jean-Louis Basdevant
    Pages 1-20
  3. Jean-Louis Basdevant
    Pages 21-46
  4. Jean-Louis Basdevant
    Pages 47-66
  5. Jean-Louis Basdevant
    Pages 67-96
  6. Jean-Louis Basdevant
    Pages 97-106
  7. Jean-Louis Basdevant
    Pages 107-144
  8. Jean-Louis Basdevant
    Pages 145-165
  9. Back Matter
    Pages 167-183

About this book


Optimization under constraints is an essential part of everyday life. Indeed, we routinely solve problems by striking a balance between contradictory interests, individual desires and material contingencies. This notion of equilibrium was dear to thinkers of the enlightenment, as illustrated by Montesquieu’s famous formulation: "In all magistracies, the greatness of the power must be compensated by the brevity of the duration."

Astonishingly, natural laws are guided by a similar principle. Variational principles have proven to be surprisingly fertile. For example, Fermat used variational methods to demonstrate that light follows the fastest route from one point to another, an idea which came to be known as Fermat’s principle, a cornerstone of geometrical optics. Variational Principles in Physics explains variational principles and charts their use throughout modern physics. The heart of the book is devoted to the analytical mechanics of Lagrange and Hamilton, the basic tools of any physicist. Prof. Basdevant also offers simple but rich first impressions of Einstein’s General Relativity, Feynman’s Quantum Mechanics, and more revealing and amazing interconnections between various fields of physics.

A graduate of the Ecole Normale Superieure, Jean-Louis Basdevant is Professor and former Chair of the Department of Physics at the Ecole Polytechnique, and Director of Research for the CNRS. Specializing in the theoretical physics of elementary particles, quantum field theory and astrophysics, Prof. Basdevant works in the Leprince-Ringuet Laboratory at the Ecole Polytechnique.


field theory fields mechanics modern physics optics optimization path integral physics quantum mechanics relativity theory of relativity

Authors and affiliations

  • Jean-Louis Basdevant
    • 1
  1. 1.Physics DepartmentÉcole PolytechniquePalaiseauFrance

Bibliographic information