Here are my solutions to various problems in the textbook *Quantum Field Theory for the Gifted Amateur*, by Tom Lancaster and Stephen J. Blundell (Oxford University Press, 2014). Obviously I can’t offer any guarantee that all the solutions are actually *correct*, but I’ve given them my best shot.

**These solutions are the only ones that I’ve worked out so far, so please don’t ask me to post “the rest of the chapters” as I haven’t worked on those yet. I will get to them eventually.**

**Chapter 1 – Lagrangians**

Exercises

1.1, 1.2, 1.3, 1.4, 1.5, 1.6

** Chapter 2 – Simple harmonic oscillators**

**Chapter 3 – Occupation number representation**

**Chapter 4 – Making second quantization work**

- 4.1 Field operators for the infinite square well
- 4.2 Second quantizing a single-particle operator

- 4.2 Second quantizing operators – examples
- 4.3 Second quantizing the tight-binding hamiltonian

andyThanks for actively working and posting the problems ! I’ve got about half way in the book (which I enjoy) but have not got going on the problems, this should help motivate me to start on them …

growescienceAlthough I’ve only read as far as Chapter 4 so far, I find that the problems don’t really delve that deeply into

the concepts developed in the text itself, so you really need to work through the examples in the text in detail

to get a proper understanding of what’s going on. Maybe it’s because quantum field theory isn’t a subject I

ever studied in my days as a physics student, but I find the subject kind of rough going at times.