This is my latest, and my favourite, drawing of Schroedinger's cat. It's copied from a hand-drawn graphic shown during a lecture by quantum cosmologist James Hartle that I just attended this afternoon at the grand opening of The Perimeter Institute in Waterloo. (Thanks to friend GH for taking me!) Hartle's thing is a single, manageable equation that describes the wave function of the entire universe. Extreme. I couldn't tell exactly if he has this equation, or if he is working towards having this equation. His lecture was excellent, however, especially because of his use of very, very cool magic-marker graphs and diagrams that he shuffled on and off the overhead projector with professorial aplomb. No cookie-cutter power point presentation for this guy! Check out some of his more advanced level artwork here. I couldn't resist stealing this one below. I believe the little stick figure is busy conducting the double split experiment which is foundational to quantum theory and which still befuddles me despite the fact that I've been led through it many many times. I believe the gist is this: fire a beam of light at an opaque surface with two little holes in it. Photons will go through the tiny holes and make a random seeming dot pattern on the surface behind. Fire enough photons, however, and you invariably get an interference pattern, like a bunch of waves. Photons are behaving like particles and like waves at the same time. Now the spooky part: if you try to measure which hole the photon goes through, it will go through the hole you test for. ...I can describe it...sort of...but I don't get it.
There aren't any cat drawings on the website, so you'll have to be content with my little rendition above. I think Hartle rolled out the felines today cause they're crowd-pleasers, and the lecture was aimed at a general, walk-in audience like me. I find Schroedinger's cat is easier to grasp than the double split experiment, even though the latter is a bonafide, empirical experiment conducted in reality and the former is just a mental model. You all know the story: the cat is in the box and an atom in the box might decay and if it does it will release a hammer which will smash open the bottle of cyanide and the cat will then die. Or the atom won't decay and the cat will live. You don't look in the box and so you don't know. The cat is alive/dead, a state called a superposition. Says Hartle: "Quantum reality consists of complementary views, mutually exclusive, but equally necessary for a complete description."
I believe his drawing below also includes some familiar astrological bodies, being the earth and sun, and all that stuff is in a box, like maybe the cat-box, and there is an eye that can't see into it. Meaning....uh....I have no idea...but based on what he said today, something about how all of reality can be represented by a master wave function. Unfortunately the web lecture seems to be offline.
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