Physics
drorzel | April 10, 2012Between unpleasant work stuff and the Dread Stomach Bug wiping out the better part of five days, I only got my student evaluation comments for my winter term class last week, and I'm only getting around to writing the post-mortem now. This was, for those who may not have been obsessively following my course reports, a "Scholars Research Seminar" class with the slightly cute title "A Brief History of Timekeeping," which is intended to introduce students to scholarly research and writing. The topic for my SRS was timekeeping, specifically the development of various timekeeping technologies and…
drorzel | April 9, 2012 I'm trying not to be Neurotic Author Guy and obsessively check online reviews of How to Teach Relativity to Your Dog every fifteen minutes. I've actually been pretty successful at it, so successful that I didn't notice the first posted review at Amazon until my parents mentioned it to me. It's a really good one, though:
I'm at the point know where I could answer some of the most basic questions that his dog has, but I remember a time when I couldn't and when the questions the dog asks would've been exactly the questions that I would have had. Pretty much every time a statement by the author…
drorzel | April 5, 2012Over in Scientopia, SciCurious has a nice post about suffering from Impostor Syndrome, the feeling that everyone else is smarter than you are, and you will soon be exposed as a total fraud. Which is nonsense, of course, but something that almost every scientist suffers at some point. The post ends on a more upbeat note, though, when she thinks about fighting it:
The more I thought about ways to combat imposter syndrome, either by myself or in academia in general...the more I came up with nothing. Until today, when I was working out.
I'm doing circuit training, and as I worked my way through…
drorzel | April 5, 2012Two things I was forwarded or pointed toward this week, that interact a little oddly. First chronologically is from the New York Times, which has a story about how Harvey Mudd College has boosted the number of female computer science majors, by committing serious resources to reforming the intro course (which is required of all students there):
Known as CS 5, the course focused on hard-core programming, appealing to a particular kind of student -- young men, already seasoned programmers, who dominated the class. This only reinforced the women's sense that computer science was for geeky know-…
drorzel | April 4, 2012Over in Twitterland, we have a question from WillyB:
If you had to pick one topic to cover in Physics, which do you think is the most important for the gen. public?
This sounds like a job for the Internet! To the polling machine!
If you had to pick one topic to cover in Physics, which do you think is the most important for the general public?
While several of the options allow linear superpositions of solutions, this is a purely classical poll, so you may choose only one answer. Though you should, of course, feel free to bitch about the choices in the comments.
esiegel | April 3, 2012"...the publisher wouldn't let us call it the Goddamn Particle, though that might be a more appropriate title, given its villainous nature and the expense it is causing."
-Leon Lederman, author of The God Particle
The Higgs Boson: you know the deal. It's the last undiscovered particle in our current picture of all the fundamental particles in the Universe.
Image credit: Fermilab, retrieved from eurekalert.org.
If we can find it, we'll either have a big clue as to what the next step to take in physics will be, or we'll be forced to admit that physics works too well, and many of the great…
drorzel | April 2, 2012So, the infamous OPERA result for neutrino speeds seems to be conclusively disproven, traced to a problem with a timing signal. Matt Strassler has a very nice explanation of the test that shows that the whole thing can almost certainly be traced to a timing error that cropped up in 2008. This problem is generally described as resulting from a "loose fiber optic cable," and Matthew Francis's reaction is fairly typical
The main culprit was a fiber optic cable that was slightly out of alignment. This is not quite a "loose wire", as it sometimes has been described: it's far more subtle and harder…
drorzel | April 1, 2012In comments to yesterday's post, Andrew G asked:
Speaking of writing, is there an errata list somewhere for "How to teach relativity to your dog"?
No, but there probably should be. I believe there's an error in one of Maxwell's equations (an incorrect sign, though you should've seen the first typeset version...), but given the length and complexity of the book, there are almost certainly other mistakes. So, if you've spotted an error, in physics, grammar, or anything else, leave a comment here, and I'll compile a list of things to fix if we ever get the chance.
drorzel | March 30, 2012Steve Hsu has a post comparing his hand-drawn diagrams to computer-generated ones that a journal asked for instead:
He's got a pretty decent case that the hand-drawn versions are better. Though a bit more work with the graphics software could make the computer ones better.
This reminded me, though, of something I've always found interesting about scientific publishing, namely the evolution in the use of figures through the years. Whenever I need to do literature searching, I always suspect you could guess the approximate date of a paper's publication by looking at the figures.
If you go back…
jeure | March 29, 2012Imagine looking in the mirror and finding your familiar face reflected back as you've always known it. But as you look more closely, as you precisely examine that mirror image, subtle distortions emerge. The glass itself remains flawless, but real and fundamental differences exist between you and the face that lives on the other side of the looking glass.
Something similar happens in the quantum world when matter is examined against its exotic reflection: antimatter. The analogy is admittedly fanciful, but it's no more dramatic than the dynamics of these almost-twins, which annihilate one…
esiegel | March 27, 2012"Think binary. When matter meets antimatter, both vanish, into pure energy. But both existed; I mean, there was a condition we'll call 'existence.' Think of one and minus one. Together they add up to zero, nothing, nada, niente, right? Picture them together, then picture them separating--peeling apart. ... Now you have something, you have two somethings, where once you had nothing." -John Updike
Looking out at our Universe, at the myriad of stars, galaxies, and, well, "stuff" in our Universe, it's hard not to ask yourself where it all came from.
Image credit: Rogelio Bernal Andreo, retrieved…
drorzel | March 26, 2012The title says it all: an animated video of Heisenberg singing about the Uncertainty Principle:
So, you know, there's that. It's pretty good, but he's no Feynman:
And that's your silly musical break for the day.
drorzel | March 26, 2012 Richard Feyman famously once said that the double-slit experiment done with electrons contains everything that's "'at the heart of quantum physics." It shows both particle and wave character very clearly: the individual electrons are detected one at a time, like particles, but the result of a huge number of detections clearly traces out an interference pattern, which is unambiguously a wave phenomenon. The experiment has been done lots of times, but a particularly nice realization of it comes from Hitachi's R&D department, where you can see both still images and video of their experiment…
drorzel | March 25, 2012I had a signing yesterday at the Barnes & Noble in Vestal, NY, which drew a smallish crowd mostly of friends and family. SteelyKid came, of course, and while she spent most of her time bopping about other parts of the store, she came over to the signing area while I was signing books for people after reading a bit. They had a big stack of copies of How to Teach Relativity to Your Dog, and she started picking them up and handing them to me.
"No, honey," I said, "Those are for other people. Give them to somebody else." So she happily ran one over to my mother. And then to one of my aunts.…
drorzel | March 23, 2012So, the previous post poses a physics question based on some previous fooling around with modeling my commute:
A car starts from rest at the beginning of a straight 1km course, accelerates up to some speed, cruises at constant speed for a while, then decelerates to a stop at the end of the course. A second, identical car does the same course, but decelerates to a stop at the halfway point. It then immediately accelerates back to its cruising speed, and then decelerates to a stop at the end of the course.
How much faster does the second car have to go in order to complete the course in the…
drorzel | March 23, 2012Back in the summer, I did a post mathematically comparing two routes to campus, one with a small number of traffic lights, the other with a larger number of stop signs, and looked at which would be faster. Later on, I did the experiment, too.) Having spent a bunch of time on this, I was thinking about whether I could use this as a problem for the intro physics class. I decided against it last fall, but something else reminded me of this, and I started poking at it again.
So, I played around a bit with some numbers, and came up with the following possible framing for a question. I'll throw…
drorzel | March 23, 2012The quick publicity items for this weekend:
1) I will be on the Science Fantastic radio show either Saturday or Sunday, depending on when your local affiliate runs it (or when you choose to livestream it over the Internet). The interview has already been recorded, which leaves me free for:
2) I will be signing and possibly reading from the new book at the Barnes and Noble store in Vestal, NY at 2pm on Saturday. If you're fortunate enough to live in the Southern Tier, stop by and say hi.
drorzel | March 22, 2012"Hey, dude," the dog says, looking concerned. "We need to talk."
"Yeah? What's up?"
"Look, it's great that you're transcribing the human puppy's stories into Twitter and all, but I'm feeling left out. I've got my own Twitter account and all, but you hardly ever type any of my tweets any more. I have to do it myself, and it's hard to be witty when you have to type with your nose."
"I'm sorry. Is there something specific you'd like to tweet about?"
"Well, yeah," she says, in a tone like I've said something stupid. "I mean, obviously, we have a new book about relativity. And look at this…
drorzel | March 21, 2012It's been a while since I did any ResearchBlogging posts, because it turns out that having an infant and a toddler really cuts into your blogging time. Who knew? I keep meaning to get back to it, though, and there was a flurry of excitement the other day about a Nature Physics paper proposing a way to search for quantum gravity not with a billion-dollar accelerator, but with a tabletop experiment. There's a write-up at Ars Technica, but that comes at it mostly from the quantum gravity side, which leaves room for a little Q&A from the quantum optics side.
Wait a minute, you said this is in…
drorzel | March 20, 2012So, this is the new book from the authors of Why Does E=mc2?, covering quantum mechanics in a roughly similar manner. This book, or, rather, Brian Cox talking about some material from this book, created a bit of controversy recently, as previously discussed. But other than that, Mrs. Lincoln, how did you like the play?
The big hook here is that they set out to discuss quantum mechanics for a popular audience using a Feynman-type picture from the very beginning. This is an intriguing idea, and sort of appealing in the same basic way that Sakurai's famous graduate text in quantum mechanics and…