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Physics Notes

Just another alQpr Sites site

  • Preface
  • Math Prereqs
    • A Note on Dimensional Analysis
    • Vectors and Tensors
      • tensors2 – fromQuora
  • Classical Mechanics
    • Classical Mechanics
    • Module 1
    • Module 2
    • Module 3
    • V.Toth on Hamiltonian vs Lagrangian
  • ElectroMagnetism
    • Electro-Magnetism
  • Relativity
    • Relativity
      • Special Relativity
        • Derivations
          • From First Principles
          • From Electromagnetism
          • From Speed of Light
        • Contraction vs Dilation
        • Puzzles and Paradoxes
          • The Ladder Paradox
          • Twin Paradox
            • Acceleration
          • Ehrenfest Paradox
        • Graphical Simulation
        • Dynamics
      • General Relativity
        • Gravity
          • On the Approach to a Black Hole
            • Part I – Falling onto the event horizon
              • Lemma 1- red shift gradient for a point mass
            • Part 2 Evolution to Black Hole of a Large Gas Ball
              • Lemma 2 – Red Shift Gradient Inside a Gas Ball
  • Quantum Theories
    • History of QM
      • “Old Quantum Theory”: Planck, Einstein, and Bohr
      • Matrix Mechanics: Born, Jordan, Heisenberg
      • Derivation of Schroedinger’s Equation
      • All Together Now: Dirac and von Neumann
      • Relativistic Theory and Quantum Fields
      • Later Developments
    • General Structure
      • States and Observables
        • Observables
          • Why Symmetry is not enough
        • States
          • States – Pure, Mixed, & Entangled
            • EPR, Bell, and All That
              • Collected References on EPR, Bell, etc.
      • Measurement in Quantum Mechanics
        • Quantum Measurement Process
        • Quantum Measurement Process
        • Measurement
        • Schroedinger’s Cat is Wigner’s Friend
      • Path Integrals
        • Path Integrals
      • Interpretations
        • Interpretation Debates
  • Atmospheric Greenhouse Effect
    • Greenhouse Saturation
      • The Angstrom Argument
    • Human Energy Consumption
      • Society
  • Online Physics Resources
  • The Blog
    • Archives

Recent Posts

  • Hermitian but non-SA in QM
  • Decay times of excited atomic states
  • What if the “luminiferous aether” really exists? 
  • Hilbert Distance and Similarity of States
  • Why Least Action?

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Classical Mechanics

  • Classical Mechanics
  • Module 1
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  • EulerLagrangeLinks
  • V.Toth on Hamiltonian vs Lagrangian
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