This site contains my notes and solutions to various problems in some textbooks in physics and related fields. The site is fairly technical, in that I use whatever mathematics is required to explain the various topics. It is most useful to those who are either taking a structured course at a university or online, or to those who are working through a topic on their own. Although I've tried to make most articles self-contained, there is no substitute for a good textbook and/or an organized course. As such, I'd strongly recommend you buy a textbook (it doesn't have to be one of the ones I've used; there are many to choose from) and use that as your primary source. There are also many good courses available online for free at such sites as edX and coursera. There is also a large collection of lectures on several areas of physics given by Leonard Susskind on his Theoretical Minimum site.

Comments pointing out errors in an article or requesting clarification of some point in an article are welcome. As this site is not technically a blog, you will need to use the auxiliary blog to post comments.

I will use the auxiliary blog to announce new articles added to the main site, so if you want to be kept up to date, check that blog regularly, or else subscribe to it for email notifications. I realize this may look like a roundabout way of organizing things, but I don't trust WordPress with anything substantial any more.

If you're seeking help on some topic in physics that isn't covered here, you may find Physics Forums helpful.

A historical note for those who followed my old physicspages.com site. The original site was run using WordPress, but the underlying database got corrupted and was not possible to repair, even from the backup. As a result, I've rebuilt the site without using WordPress, so all the posts are now PDF files. Although PDFs have their problems, in that some browsers don't display them fully without a plugin, they have the advantage that the Latex mathematics displays more neatly, and some symbols not available in WordPress's implementation of Latex are now available.

Frequently Asked Questions |
---|

To search physicspages, enter your search terms in the Custom Search box below. In the results, the top links may be ads, so just ignore them. This will search only within the physicspages site, so if you want an internet-wide search, use your usual search page.

Topic indexes | |
---|---|

Mathematics | Astrophysics |

Electrodynamics | Thermal Physics |

Quantum Mechanics | Relativity |

Relativistic Quantum Mechanics & Quantum Field Theory |

Here are some attempts at learning quantum field theory from various textbooks. Most of these books
proved too difficult after a few pages, so the number of posts for them is quite limited. After getting stuck in Lahiri & Pal's Chapter 11, I've now returned to
Lancaster & Blundell's book *Quantum Field Theory for the Gifted Amateur*, which now seems much more approachable (or maybe I'm just more gifted now...).

The book *Quantum Field Theory - Lectures of Sidney Coleman* (World Scientific; 2019) is a large (1100+ pages) book containing transcripts of
QFT lectures given by the late Harvard physicist in 1975-76. The book seems to be one of the more approachable tomes on QFT, as
Coleman provides a lot of background insight on the concepts as well as deriving the equations. Well worth a look. However, since all the problems in the book have detailed solutions provided, I won't be doing any posts on this book.

**For an index of topics, see the link in the "Topic indexes" table above.**

Astrophotos |
---|

For general interest, I'm also posting a few astrophotos I've taken with my home telescope. Here is the index. |