Ayush Singh's Blog

March 13, 2024

An Outline for Witten's Analytic Continuation of Chern–Simons Theory

I hate reading long PDFs that do not have an outline attached. So, I spent one afternoon making an outline for arXiv:1001.2933, when I should have been reading it.

May 28, 2022

How to Make a NiSERCast

It has been a year since the last episode of NiSERCast, and it has been more than two years since the idea of a science communication podcast led by NISER students was initially conceived. Partly for archival reasons and partly for self-indulgent reasons, here are some reflections from my involvement in the project.

February 23, 2022

How to (Not) Write a Computational Physics Library

An introduction to my misguided attempt at writing a computational physics library from *scratch*. In this post I try to convince myself that using ANSI C for this project is not a mistake.

May 16, 2020

Quantum Isothermal Processes are Not Isoenergetic

I define what it means for a quantum system to undergo an isothermal process, and we see that unlike what happens for a classical ideal gas, the internal energy of the system can change in such a process.

March 23, 2020

Origin of Angular Momentum Quantization in Bohr's Model of Hydrogen Atom

To me, the quantization of angular momentum in terms of ħ has always felt like a very ad hoc assumption. In this post I start with the information available to Bohr at the time and derive the famous quantization rule.

February 20, 2020

Electromagnetic Fields and Arbitrary Lorentz Transformations

This post goes over the algebra involved in deriving the expressions of electric and magnetic fields under the most general Lorentz transformation. I could not find this anywhere else on the internet.