Category Archives: Topical

Includes posts on physics, philosophy, sciences, quantitative finance, economics, environment etc.

Binding Books

When I was about 15, oh so long ago now, I had this crazy hobby of book binding, which is like the process of turning a paperback into a hardcover, or adding a hardcover to an exercise book. With the mild OCD that I have, I do get a bit carried away with such things, and no books around me or in my dad’s collection were spared. I collaborated with a local printing press to access their cutting machine and local stationery stores to research on various techniques and acquire supplies. My crowning moment was when I did a “full-calico” binding on a rather useless book that my dad had recently purchased.
Continue reading

When Your Child is as Big as You

My mom used to say that when your child is as big as you, you have to treat them with respect. What she actually said was that you had to address them using a respectful form of “you,” which doesn’t make any sense in English, but may work in Hindi or French. It worked poetically well in Malayalam. I was reminded of this maternal pearl of wisdom recently when I was watching a movie with my son.

Continue reading


Life is full of contradictions.

I am attending a research retreat on mindfulness and contemplative practices at the beautiful Garrison Institute. I am learning a lot of interesting things, and meeting a lot of like-minded and excellent people – the kind of people with whom I could have deep conversation about the unreal nature of reality, unlike most people from other walks of life would politely and tactfully excuse themselves when I get a bit unreal.

Continue reading

Twilight Years

At some point in our life, we come to accept the fact we are closer to death than life. What lies ahead is definitely less significant than what is left behind. These are the twilight years, and I have come to accept them. With darkness descending over the horizons, and the long shadows of misspent years and evaded human conditions slithering all around me, I peer into the void, into an eternity of silence and dreamlessness. It is almost time.

Continue reading

Interpretation of Special Relativity

When we looked at Quantum Mechanics, we talked about its various interpretations. The reason we have such interpretations, I said, QMは私たちがアクセスできない現実を扱っているということです,,en,私たちの感覚と知覚の装置を通して,,en,特殊相対論とは、動いているマクロオブジェクトに関するものです,,en,そのようなことを想像しても問題ありません,,en,では、なぜ解釈が必要なのですか?,,en,答えは微妙なものです,,en,アルバート・アインシュタイン,,de,特殊相対論,,en,光の速度,,en,光速が一定であることは単純な声明のように聞こえる,,en,しかし、それだけではありません,,en,かなりもっと,,en,この恒常性が実際に何を意味するのか見てみましょう,,en,どこかに立っていると,,en,そしてあなたの右から左に向かう光線があります,,en,スピードがあります,,en,左から右へ進む別の光線にも速度があります,,en,これまでのところ,,en,とても良い,,en,今あなたがロケット船にいるとしましょう,,en,右から左に移動する,,en,相対性理論の特別な理論,,en, through our sensory and perceptual apparatuses. On the other hand, Special Relativity is about macro objects in motion, and we have no problem imagining such things. So why would we need to have an interpretation? The answer is a subtle one.
Continue reading

Speed of Light

The speed of light being a constant sounds like a simple statement. But there is more to it, quite a bit more. Let’s look at what this constancy really means. At first glance, it says that if you are standing somewhere, and there is a ray of light going from your right to left, it has a speed c. And another ray of light going from left to right also has a speed c. So far, so good. Now let’s say you are in a rocket ship, as shown in the figure below, moving from right to left.

Continue reading

Special Theory of Relativity

アインシュタインと特殊相対性理論について聞くとき,,en,または特殊相対性理論,,en,本名を使う,,en,私たちは有名な,,en,E = mc ^ 2,,en,方程式,,en,ツインパラドックスのような奇妙なもの,,en,それらはすべて真実で重要ですが,,en,SRが解決しようとする問題は完全に異なるものです,,en,それは物理学の基本原理を守る試みです,,en,量子力学–解釈,,en,量子力学について話すときはいつでも,,en,最初の質問の一つは,,en,「猫は?,,en," この質問,,en,量子力学の解釈についてです,,en,標準的な解釈,,en,いわゆるコペンハーゲン解釈,,en,有名なシュレディンガーの猫につながります,,en,量子力学,,en,シュレディンガー,,en,量子場理論,,en,量子力学に関するこの投稿では,,en,QM,,de (or the special theory of relativity, to use the real name), we think of the famous E = mc^2 equation, and weird things like the twin paradox. While those things are all true and important, the problem SR tries to solve is a completely different one. It is an attempt to defend a basic principle in physics.
Continue reading