Tag: standard model
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What are RG flows?
In this post, I will explain what Renormalization Group (RG) flow is. I will assume the knowledge of the basics of QFT for this post. The idea of an RG flow is intimately related to the idea of effective field theories (EFTs). An EFT is a theory that makes predictions upto some energy scale (called…
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How to make the Standard Model?
This is a post to describe how we construct the standard model lagrangian and generate the masses for gauge bosons and fermions. I will assume basic familiarity with QFT, lagrangians, gauge transformations and gauge groups (like U(1), SU(2)). Recall that the mass term of a scalar field φ is simply proportional to φ2. Vector fields…
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What is supersymmetry?
This post summarizes the main ideas behind supersymmetry. Pre-requisites to read this post include some familiarity with Poincare algebra and basics of quantum field theory (especially the basics of fermions) In relativistic quantum field theory, we have a certain amount of spacetime symmetries. These symmetries include 3 rotational symmetries (along three space directions), 3 boost…
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Polchinski Volume 1 review
This is a chapter-by-chapter review of volume 1 of Polchinski’s book on string theory.
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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 