From identity to indistinguishability

• Autores: Enric Pérez Canals
• Localización: The Circulation of Science and Technology: Proceedings of the 4th International Conference of the European Society for the History of Science. Barcelona, 18-20 November 2010 / coord. por Antoni M. Roca Rosell, 2012, ISBN 978-84-9965-108-8, págs. 791-797
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • It is widely accepted that the papers by Bose in 1924 and by Einstein in 1924-1925 definitely opened the path to the quantum concept of ‘indistinguishability’. Since then, distinction in physics between ‘identity’ and ‘indistinguishability’ of particles has come to be required.

    However, even before the rise of quantum physics, Maxwell, Boltzmann and Gibbs, among others, had to tackle the difficulties and paradoxes that appear when counting identical particles. Later, after Sackur’s and Tetrode’s first quantum derivation of the canonical partition function of an ideal gas, much confusion arose around its dependence on the number of molecules in the system. Many other physicists, such as Planck, Lorentz or Schrödinger took part in those debates. In 1921, Ehrenfest and Trkal devoted a whole paper to this subject.

    Clearly, in the days before Bose’s seminal work, embroiling and misunderstanding were commonplace.

    In considering the emergence of the distinction between ‘identical’ and ‘indistinguishable’ particles, we will go through the so-called statistical route to quantum mechanics. The first developments in statistical mechanics became immediately confused and entangled with the irruption of quantum physics. In the first quarter of the twentieth century the mutual influence between both disciplines was profuse.

    We will pay special attention to the story of the so-called ‘Gibbs Paradox.’ We will argue that what is now often known by this name in some textbooks of statistical mechanics did not exist as such in those foundational days.