# Cambridge Lectures on Theoretical Physics

Here’s another update to the ultimate list of free physics book list. This time, we have a bunch of lectures notes on theoretical physics available from Cambridge university. For full pdf’s click on the title.

**1. Concepts on Theoretical Physics:**

- Principle of Least Action: PDF
- Quantum Mechanics: PDF
- Particle Physics: PDF
- General Relativity: PDF
- Cosmology: PDF

- Newtonian Mechanics: PDF
- Forces: PDF
- Interlude: Dimensional Analysis: PDF
- Central Forces: PDF
- Systems of Particles: PDF
- Non-Inertial Frames: PDF
- Special Relativity: PDF

- Newtonian Mechanics: PDF
- The Lagrangian Formulation: PDF
- The Motion of Rigid Bodies: PDF
- The Hamiltonian Formulation: PDF

- Fundamentals of Statistical Mechanics: PDF
- Classical Gases: PDF
- Quantum Gases: PDF
- Classical Thermodynamics: PDF
- Phase Transitions: PDF

- Things Bumping Into Other Things: PDF
- Kinetic Theory: PDF
- Stochastic Processes: PDF
- Linear Response: PDF

**6. Quantum Field Theory (videos here):**

- Preliminaries: PDF
- Classical Field Theory: PDF
- Canonical Quantization: PDF
- Interacting Fields: PDF
- The Dirac Equation: PDF
- Quantizing the Dirac Field: PDF
- Quantum Electrodynamics: PDF

- Introduction: PDF
- The Classical String: PDF
- The Quantum String: PDF
- Open Strings and D-Branes: PDF
- Introducing Conformal Field Theory: PDF
- Path Integrals and Ghosts: PDF
- Scattering Amplitudes: PDF
- Low Energy Effective Actions: PDF
- Compactification and T-Duality: PDF

**8. Solitons:**

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**Category**: Free eBooks