Hello again, I'm Paul, I am semi retired & father of two young ladies. I live in the UK with my partner. I work from home as a Drupal security expert helping to keep Drupal websites and web servers secure.

Outside of "work", I explore [theoretical physics]

Lectures on Classical Dynamics, David Tong, University of Cambridge

The Feynman Lectures on Physics, Volume I, Richard Feynman

The Feynman Lectures on Physics, Volume II, Richard Feynman

Quantum Physics I, Barton Zwiebach

lecture notes

Quantum Physics II, Barton Zwiebach

lecture notes

Quantum Mechanics, J.J Binney, University of Oxford

The Feynman Lectures on Physics, Volume III, Richard Feynman

Principles of Quantum Mechanics, R Shankar [Free download from Springer. Email me for a copy]

Quantum Mechanics I, Namık Kemal, PAK

Quantum Physics III, Barton Zwiebach

lecture notes

Quantum Field Theory, David Tong

lecture notes

Quantum Field Theory, Tobias Osborne

lecture notes

Quantum Field Theory (Fall 2018), Kevin Cahill

If you would like to purchase a book for further reading I can recommend Field Quantization by Walter Greiner & Joachim Reinhardt

Advanced Quantum Field Theory, Tobias Osborne

lecture notes

Quantum Field Theory II (Spring 2019), Kevin Cahill | Class notes | Additional notes

Physics from Symmetry, Jakob Schwichtenberg [Free download from Springer. Email me for a copy of the book | Errata] This is probably the best introductory book I have seen written on symmetry in physics.

If you would like to purchase a book for further reading I can recommend Quantum Field Theory by Franz Mandl, Graham Shaw & Quantum Field theory and the Standard Model by Matthew D. Schwartz. [Free download from harvard.edu. Email me for a copy of the PDF]

Standard Model Review, Paul Langacker

Grand Unification and the Standard Model (PDF) | Introduction to Standard Model and Electroweak Physics (PDF)

Relativity, Neil Turok, Perimeter Institute for Theoretical Physics

Lecture Notes on General Relativity, Sean M. Carroll (PDF)

The Early Universe, Alan Guth, MIT

lecture slides

Supersymmetry, Fernando Quevedo, University of Cambridge

lecture notes

Explorations In Particle Theory, Ben Allanach, Perimeter Institute for Theoretical Physics

lecture notes

Introduction to String Theory, Neil Lambert

lecture notes | solutions

Lectures on String Theory, David Tong, University of Cambridge

An Introduction to String Theory, Kevin Wray, University of California, Berkeley

String Theory Review, Barton Zwiebach, Perimeter Institute for Theoretical Physics

Introduction to Superstrings and M-Theory, Michio Kaku [Free download from Springer. Email me for a copy of the book]

Strings, Conformal Fields and M-theory, Michio Kaku [Free download from Springer. Email me for a copy of the book]

Introduction to Loop Quantum Gravity, Carlo Rovelli, CPT, Marseille

Covariant Loop Quantum Gravity, Carlo Rovelli & Francesca Vidotto

Lectures by Kevin Cahill: Fall 2017 | Spring 2017 | Spring 2018

Differential Equations and Linear Algebra, Gilbert Strang

Group Theory in a Nutshell for Physicists, Anthony Zee

Multivariable Calculus, Edward Frenkel

A Course of Pure Mathematics, G. H. Hardy, 1908

A Course of Modern Analysis, E. T. Whittaker and G. N. Watson

This book has been partially transcribed on the web.

A Treatise on the Integral Calculus, Volume I, Jospeh Edwards, 1921

A Treatise on the Integral Calculus, Volume II, Jospeh Edwards, 1922