Topics Not Covered in This Book

This chapter offers a survey of topics that could not have been included in the main text of the book for lack of space and time. These include some more advanced topics directly related to the material covered in the book, namely the effects of nonzero temperature and some topological aspects of broken symmetry. Moreover, the scope of the book is extended by a brief introduction to generalized symmetries and their spontaneous breaking. Finally, the text is wrapped up by a discussion of conditions under which a symmetry actually can be spontaneously broken, including an overview of no-go theorems for spontaneous symmetry breaking.