Recently I returned from a particle physics experiment at the Paul Scherrer Institut, a nuclear research lab in Switzerland. I was one of ten students from the University of Heidelberg and ETH, Zürich who had two weeks of (nearly) free reign to carry out an experiment on the PSI’s proton beam line. To put into perspective how crazy that is, ordinarily the going rate for such a privilege is €10,000s per day!
Our goal was to measure a mysterious number called the “Panofsky ratio”. The ratio is named after Wolfgang Panofsky, first to attempt to measure it, and corresponds is the relative likelihood of two events involving particles called protons and pions occurring. It is important, because historically its value strongly contradicted the expectation of theoretical physicists. The two processes occur by means of two different forces — one by the weak interaction and the other by QED — and so the ratio was expected to be somewhere near the ratio of strengths of these interactions, give or take a few corrections, which happens to be around 30 Continue reading
The Schrödinger equation describes the energy and time-evolution of a particle or system of particles, and is one of the fundamental building blocks of modern physics. In it’s general form, the (time-independent) Schrödinger equation looks like this:
There are relatively few situations in which the Schrödinger equation can be solved analytically, and numerical methods and approximations are one way around that analytical limitation. To demonstrate how this is possible and how a numerical solution works, what better way than to solve a system which can be solved analytically and comparing the results. Continue reading
The general Runge-Kutta algorithm is one of a few algorithms for solving first order ordinary differential equations. Below is a specific implementation for solving equations of motion and other second order ODEs for physics simulations, amongst other things. Continue reading
Well, I never made it mainly because I didn’t understand how. Could this be the best thing my physics degree has taught me thus far? Continue reading
Just a quick one here.
It’s pushing a month since I last checked in, and not for want of desire. I’ve not been entirely negligent though: I’ve been busy putting together a few typed up solutions to both foundational and pretty challenging/rare problems in statistical physics.
My motivation is two-fold: a) to get extremely familiar with the material, what with exams just around the corner and b) for a few of the problems, the solutions are nearly impossible to do or to find help online for if you can’t do them.
Finally, after around six months of meaning to, I’ve got round to designing and launching my blog! So, by means of introduction, here’s my token first post, a little about me, and the design and background of the blog.
< -- That's me right there. I'm currently studying an MPhys in Physics at the University of Manchester, though during this, my third year, I'm studying at the Universität Heidelberg, Germany on the Erasmus programme (till Summer 2013, if you’re reading this at a later date).
Although I do really enjoy Physics, and find the most mundane of equations fascinating, truth be told my heart has moved elsewhere. My main interests now lie in web and software development. Network and web app security also strongly appeal to my rebellious streak.
Enough about me; about the blog: Continue reading