Tag: #einstein
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What are conformal field theories? (Part 1)
In this series of posts, I will explain what conformal field theories (CFTs) are. Basic familiarity with Quantum Field Theories (QFTs) is assumed. In usual relativistic QFTs have some spacetime symmetries. These symmetries are rotations (one about every space direction), boosts (one along every space direction) and translations (one along every spacetime direction). The set…
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How to derive the Schwarzchild metric?
In this post, we will go through the reasoning that gives us the Schwarzchild solution of Einstein field equations. Prerequisites for this post include familiarity with Einstein field equations. We start with the Einstein field equation (EFE) and convert it to a form that is used to solve this equation. This form is called the…
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First corrections to GR
In this small post, I will show why the first few possible corrections to the Einstein-Hilbert action are the way they are. Basic familiarity with General Relativity is assumed. I will use the natural units (units used in high energy physics) in this article. In these units, the unit of length is the inverse of…
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How to derive Einstein’s field equation?
This post summarizes the reasoning that goes in deriving Einstein’s field equation. There are more than one ways to derive this field equation but I will focus on the most conventional path to derive it. Basic understanding of tensor analysis and special realtivity is assumed to understand this post. What we need is an equation…
Hassaan Saleem 