David Tong -- Concepts in Theoretical Physics -- University of Cambridge

David Tong: Concepts in Theoretical Physics

These lectures provide bite sized introductions to a handful of topics in theoretical physics, aimed at first year undergraduates. Presentations can be downloaded below.


  • Principle of Least Action:   PDF File
    Principle of least action, Unification of physics, Feynman's path integral formulation of quantum mechanics.
  • Quantum Mechanics   PDF File
    Applications of Quantum Mechanics, The Principle of Superposition, Eigenvalue Equations and Probability, Entanglement.
  • Particle Physics   PDF File
    Fundamental Particles, Antiparticles, Fundamental Forces, QCD and Confinement of Quarks, Higgs Boson, LHC.
  • General Relativity   PDF File
    Equivalence Principle, Light Bending, Gravitational Redshift and Time Dilation, Gravity as Geometry, Schwarzschild solution, Geodesic motion as orbits.
  • Cosmology   PDF File
    Composition of the Universe. History of the universe, Friedmann equations. Cosmic Microwave Background and density perturbations. Singularity problem, Quantum gravity.