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I am writing this for myself but if someone wants to read it as well, you are welcome. My father passed away on 29th January, 2024 and I wrote this small eulogy for him at that time. I am extending it and posting it here as well. The relationship between a father and a son
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This is a post in which I am just thinking out loud (writing your thoughts down is a great way to think out loud and organize your thoughts). The things that I write in this post may also be beneficial for some younger student of theoretical physics (which, if true, will be a bonus for
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This is second of my series of posts on AdS3/CFT2 correspondence (for the first post, click here). In this post, I will describe what WZW (Wess-Zumino-Witten) models are. They are relevant here because a WZW model is used to decribe string theory on AdS3 . Basics of field theory, little familiarity with Lie groups and
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This is first in a series of posts on duality between strings moving on AdS3 x S3 x T4 spacetime (don’t get intimidated by this) and a conformal field theory living on the boundary of the AdS3 spacetime (which is two dimensional). I will try to explain the basics required to understand this duality. In
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This is a post that tries to answer the question, “How do we come to know that in string theory, there ‘can be’ extra dimensions in space?”. Some basic understanding of quantum field theory and general relativity is assumed as a prerequisite. Firstly, I want to point out why I have written ‘can be’ instead
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In this post, I will give arguments to motivate why Schrodinger equation has the form that it has. An understanding of classical mechanics, eigenvalues and eigenfunctions is required for following this post. In conventional formulation of quantum mechanics, there are some postulates. Among them, three postulates are as follows. The “operators” mentioned above operate on
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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
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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
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This post is first in a series about some of my recent work. It tries to implement a procedure called Barbour-Bertotti best matching principle (explained below) using an approach called Entropic Dynamics (explained in a future post). Suppose you see three stars in the sky and take a picture of them at a given time.
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This is a small post on how to try to get realistic four-dimensional spacetimes from type IIA and type IIB string theories. I will try to explain the technical points as much as I can. I will assume the knowledge of metric, Ricci, and Riemann tensors and very basic QFT. Let me know if some
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Hassaan Saleem 