Tag: particle physics
-
What are generalized symmetries?
This is a post about the generalization of the concept of global symmetries. This area has been a very active area of research for the last 8 years or so. A basic understanding of global symmetries unitary operators (acting on quantum states and operators) and local operators is required to read this post. This topic…
-
Why criticizing string theory has become a “cool thing”?
This post explores why critisizing string theory has become a “cool thing” in the last few years.
-
Have we found all string theories?
This brief post answers the question, “Have we found all string theories?”. It will require a basic understanding of QFT and symmetry algebras.
-
String Theory and M theory compactifications
This is a post about compactifications in superstring theory and M theory. This post is related to my second Ph.D. project. A little familiarity with the Ricci tensor and the word “gauge group” is assumed but I tried to make it self-contained.
-
Polchinski Volume 1 review
This is a chapter-by-chapter review of volume 1 of Polchinski’s book on string theory.
-
Gauge groups in bosonic and Type I string theories
A small post about how the cancellation of anamolies determine the unique gauge group that arises in bosonic and Type I string theories.
-
D Branes in Type II string theories
Let’s do a small post on D-Branes and their charges. Before starting, we will review some familiar concepts so that it is easy to understand what follows. A very basic understanding of electromagnetism and Quantum Field Theory (QFT) is assumed.
-
Heterotic String Theories explained
Why do we have two heterotic theories i.e. SO(32) heterotic and E8 X E8 heterotic? How do we come to this conclusion? I will present some results without derivation because their derivation requires calculations. A very basic understanding of quantum field theory is assumed and it is better if the reader has already read my…
-
Symmetries in Physics
Let’s do a popular audience level post about the types of symmetries used in particle physics. I will try to make the explanations as simple as possible without compromising the stuff that I want to explain.
Hassaan Saleem 