In comments to yesterday’s post about my favorite Many-Worlds story, a couple of people mention “All the Myriad Ways,” a Larry Niven short story. I don’t think I’ve ever actually read the story, but it gets brought up all the time, so I’m familiar with the concept. It’s an angle on Many-Worlds that I don’t… Continue reading All the Myriad Inceptions
Category: Physics
Many-Worlds in Fiction: “Divided by Infinity”
Today, Tor.com has posted the complete story “Divided by Infinity” by Robert Charles Wilson. This remains probably the best science fiction story ever using the Many-Worlds interpretation of quantum physics (though it doesn’t call it that explicitly), and also the creepiest: In the year after Lorraine’s death I contemplated suicide six times. Contemplated it seriously,… Continue reading Many-Worlds in Fiction: “Divided by Infinity”
What’s a Photon, and How Do We Know they Exist?
A reader emailed me with a few questions regarding How to Teach Physics to Your Dog, one of which is too good not to turn into a blog post: What is a photon from an experimental perspective?… Could you perhaps provide me with a reference that discusses some experiments and these definitional issues? The short… Continue reading What’s a Photon, and How Do We Know they Exist?
Reader Request: What’s the Matter with Stat Mech?
On the reader request thread, commenter Brad had several questions; one led to yesterday’s post about superconductors, another is a critical issue in pedagogy: Finally, why did all of my stat[istical] mech[anics] courses suck? Statistical Mechanics is the branch of physics that deals with building up macroscopic thermal properties of materials from a microscopic model… Continue reading Reader Request: What’s the Matter with Stat Mech?
Baez on Leggett on High-Temperature Superconductors
I had the tab open and everything, and still somehow forgot to include a link to John Baez’s blog post reporting on a talk by Tony Leggett which directly addresses some of the questions asked about yesterday’s superconductivity post. It’s about a talk called “Cuprate superconductivity: the current state of play” (“state of play” apparently… Continue reading Baez on Leggett on High-Temperature Superconductors
How Do Superconductors Work?
In the reader request thread, Brad asks about superconductors: Why is a room temperature superconductor so hard? Why do things have to be cold for there to be no resistance (I can guess, but my knowledge of super conductors consists of the words “Cooper pairs” which does not get me very far.) Since next year… Continue reading How Do Superconductors Work?
Quantum Measurement Lotto
Thoreau at Unqualified Offerings gets credit for inspiring two posts today with his proposed Murphy’s Law experiment and this one, about an unrelated issue in quantum measurement. This is an analogy suggested by a colleague a couple of years ago, comparing the projection of a quantum wavefunction in the measurement process to the lottery. The… Continue reading Quantum Measurement Lotto
Murphy Violation in Science
Over at Unqualified Offerings, Thoreau proposes an an experimental test of Murphy’s Law using the lottery. While amusing, it’s ultimately flawed– Murphy’s Law is something of the form: Anything that can go wrong, will. Accordingly, it can only properly be applied to situations in which there is a reasonable expectation of success, unless something goes… Continue reading Murphy Violation in Science
The Full Seminar Experience
Avi Steiner emailed me with a set of questions that are too good not to turn into a blog post: Being a math/science major at a small liberal arts college, I unfortunately never get the “full” experience of a math/science talk. Since I do plan on eventually attending grad school, I thought it might be… Continue reading The Full Seminar Experience
The Heffernan Conundrum
A lot of Twitter energy was soaked up Friday afternoon by a half stupid article by Virginia Heffernan at the New York Times. Sparked by Sodamageddon, she takes a look at ScienceBlogs for the first time, and doesn’t like what she sees: Hammering away at an ideology, substituting stridency for contemplation, pummeling its enemies in… Continue reading The Heffernan Conundrum