Showing posts with label psi. Show all posts
Showing posts with label psi. Show all posts

Thursday, 15 October 2009

Apology to Leo Kadanoff

I have been fortunate enough to be taught by one of the great physicists of the last century (the century - I do not need to remind anyone - of Einstein, Schrodinger, Dirac, Feynman and others..) : Prof. Leo Kadanoff. Here is a man who laid the groundwork behind some of the most profound ideas (Renormalization Group) that are a crucial part of the underpinnings of the powerful field theories that are the epitome of human attempts to understand the universe.

He taught me - in fact he is teaching me this very moment - a course on Statistical Mechanics much of which is actually material created in part by him. Many crucial ideas in the field theory course Im doing concurrently originate from him and David Tong from Cambridge who is teaching that excellent course mentioned once how sleepish he felt talking about some of these ideas with Leo Kadanoff sitting at the back of the class listening attentively.

He always comes 40 minutes before his class starts and he likes to listen to whats happening in the field theory course, and he loves to then begin his lecture by giving stat mech analogues of the field theory concepts we had been looking at. He is one of the leading proponents of 'Universality' in physics - the idea that phenomena (like critical phenomena, phase transitions) look identical across branches of physics. He likes to say, and show, how we do the same physics over and over again, the same equations reappear in completely different contexts.

He is perhaps one of the most humble most polite people Ive met. And so it is with deep - almost bitter - regret that I admit that I have not learnt much from him at all. It is my fault entirely, I simply did not make the effort necessary to appreciate and assimilate the deep concepts he was good enough to put forth enthusiastically before us, everyday, even at the age of 82. Between field theory and my indolence and laziness, I just did not do what was needed.

I am ashamed. But - if for no other reason than respect for Prof. Kadanoff - I will study and become good at Statistical Mechanics and understand renormalization before Im done with this business of theoretical physics.

I have made many similar mistakes....sleeping in PSB sir's class while he poured his heart into imparting knowledge springs immediately to mind, and perhaps I will never understand DSP and Control Systems as well as I should, but this time, I wont let it pass.


Tuesday, 1 September 2009

Free to Dream

"Be very protective of your enthusiasm. Dont let anything affect that ! If you find yourself getting stressed out, if classes seem too much, take a break. This course is for you to figure out what you want to do with your life....but we have definitely packed it with too much stuff !" (or words to that effect)
- Dr. Neil Turok to the PSI students

There are idealists in the world who create wonderful things, wonderful places, wonderful situations and I am in one of them right now, among amazing people. To bring enthusiastic people together and give them everything they need and give them the freedom to dream, think and create new ideas for mankind....surely we need a lot more such places ! As David Deutsch so eloquently said in this talk, the survival of mankind depends on the ability of our species to create the knowledge that we require to solve the massive (existential) crises that we will face sooner or later.

Im really keen to see if I can actually do what Im supposed to do now that Im here : make a real and significant contribution to my species - Humankind and to my planet - Earth, so that we may hope to live and explore and carry to distant corners of spacetime the memories of Earth. We will certainly be extinct one day, but will we leave behind only a few primitive ruins on one planet of one obscure system ? Proof that we never grew up, that we remained small minded and spiteful and primitive ? Or will a million wrecks on a million distant and inhospitable worlds bear testimony to how far beyond its 'natural' mandate this unworthy chemical scum went, exploring the universe simply because it is there !

In The Songs of Distant Earth Clarke mentions a story of a frozen leopard carcass found near the top of Kilimanjaro. (the story happens to be The Snows of Kilimanjaro by Hemingway and almost certainly true) and wonders what the leopard was doing there....what was it seeking in those bleak icy slopes when the plains below - its natural home - abounded with game ?

The Earth is the cradle of the mind, but we cannot live forever in a cradle...

Image - New Scientist

Sunday, 16 August 2009

Perimeter !

Im in Waterloo, ON, Canada now, and classes at the Perimeter Institute start tomorrow :)
All blogs specific to the Perimeter Institute and my activities here will go here. This blog will continue as it is of course....that one will be a little more tech/subject oriented.