August 15, 2013
In our last installment of the cold-atom toolbox series, we talked about why you need magnetic traps to get to really ultra-cold samples-- because the light scattering involved in laser cooling limits you to a temperature that's too high for making Bose-Einstein condensation (BEC). This time out,…
August 14, 2013
A lot has been written about Steven Pinker's article about "scientism," most of it mocking his grandiose overreach in passages like this:
These thinkers—Descartes, Spinoza, Hobbes, Locke, Hume, Rousseau, Leibniz, Kant, Smith—are all the more remarkable for having crafted their ideas in the absence…
August 14, 2013
We're getting toward the end of the cold-atom technologies in my original list, but that doesn't mean we're scraping the bottom of the barrel. On the contrary, the remaining tools are among the most important for producing and studying truly ultra-cold atoms.
Wait, isn't what we've been talking…
August 13, 2013
Today's dip into the cold-atom toolbox is to explain the real workhorse of cold-atom physics, the magneto-optical trap. This is the technology that really makes laser cooling useful, by letting you collect massive numbers of atoms at very low temperatures and moderate density.
Wait a minute, I…
August 12, 2013
Via a retweeted link from Thony C. on Twitter, I ran across a blog post declaring science a "bourgeois pastime." The argument, attributed to a book by Dierdre McCloskey is that rather than being at the root of economic progress, scientific advances are a by-product of economic advances. As society…
August 9, 2013
There was some buzz Thursday about a poll showing that 40% of white people don't have any friends of a different race. Ipsos/Reuters include a spiffy "data explorer" where you can make graphs like the one above. It does not appear to provide an easy way to get at the actual wording of the question…
August 8, 2013
This topic is an addition to the original list in the introductory post for the series, because I had thought I could deal with it in one of the other entries. Really, though, it deserves its own installment because of its important role in the history of laser cooling. Laser cooling would not be…
August 8, 2013
Long-time readers will remember that I used to do weekly kid-blogging, posting pictures of SteelyKid with a reference animal, Appa the sky-bison from the Avatar cartoon. I stopped a couple of years ago, because SteelyKid started being reluctant to pose for the pictures every week.
I got her to pose…
August 7, 2013
I spent an hour or so on Skype with a former student on Tuesday, talking about how physics is done in the CMS collaboration at the Large Hadron Collider. It's always fascinating to get a look at a completely different way of doing science-- as I said when I explained my questions, the longest…
August 7, 2013
SteelyKid was born five years ago today. I'd try to be clever and schedule this for exactly five years to the minute of her time of birth, but I've mercifully forgotten exactly when the delivery was, only that it was early in the morning after a very, very long night. Here's what she looked like…
August 6, 2013
Last time in our trip through the cold-atom toolbox, we talked about light shifts, where the interaction with a laser changes the internal energy states of an atom in a way that can produce forces on those atoms. This allows the creation of "dipole traps" where cold atoms are held in the focus of a…
August 5, 2013
One of my colleagues at Union is doing a physics education research project with a summer student, and is using an online survey to collect data. Obviously, the more people respond to the survey, the more scientific it becomes (subject to the limitations imposed by relying on self-selected Internet…
August 5, 2013
SteelyPalooza came off very well, despite high disaster potential. We were, after all, inviting a dozen five-year-olds plus assorted siblings to our house, on a day when Kate and The Pip were out of commission due to coxsackie virus. Everything went smoothly, though: the kids loved the bouncy-…
August 3, 2013
SteelyKid turns five next Wednesday (F/X: "FIVE! YEARS!" like an incredulous Jeremy Piven in Grosse Point Blank), but we're having her party today. This is a distinction we've worked hard to get across, and I expect to hear her explain to other kids and their parents about 39 times today ("It's not…
August 2, 2013
The Pip is home with coxsackie virus today, and we're having a big party for SteelyKid tomorrow (her fifth birthday is next week), so I'm too busy to do more cold-atom blogging today. So instead, we'll consider one of the great linguistic conundra of modern physics:
The document preparation system…
August 2, 2013
Thursday's tempest-in-a-teapot was kicked off by an interview with Dan Vergano in which he suggests science reporting is a "ghetto:"
The idea, and it comes from the redoubtable Tom Hayden, is that science reporting has largely become a secret garden walled off, and walling itself off, from the rest…
August 1, 2013
The last post in this series on the core technologies of cold-atom physics dealt with optical molasses, where you use the scattering of light to exert forces on atoms to make them very, very cold. It turns out, they end up even colder than the simple theory would lead you to expect, which is very…
July 31, 2013
`Once upon a time there were three little sisters,' the Dormouse began in a great hurry; `and their names were Elsie, Lacie, and Tillie; and they lived at the bottom of a well--'
`What did they live on?' said Alice, who always took a great interest in questions of eating and drinking.
`They lived…
July 31, 2013
It's been a few days since I did a work-life balance whine, but it's not like I'm not thinking about it. The problem for the moment is the psychology of trying to be productive in limited time. Specifically, while I know intellectually that I need to be efficient in working, and make the most of…
July 30, 2013
This series of posts is intended to explain the tools and tricks used to create and manipulate samples of ultra-cold atoms; thus, it's appropriate to start with how we get those atoms in the first place. This will be a very quick background on the basic force used to make atoms cold, and then the…
July 30, 2013
I have a small collection of recent research papers that I'd like to write up open in various browser tabs and suchlike, but many of these would benefit from having some relatively clear and compact explanations of the underlying techniques. And while I can either dig up some old posts, or Google…
July 29, 2013
Over at Galileo's Pendulum, Matthew Francis expresses an opinion that's sure to get him in trouble with the Inquisition and placed under house arrest: Carl Sagan's Cosmos isn't all that:
However, even taking into account the differences in TV between 1980 and 2013, the show is very slow-paced at…
July 27, 2013
A lot of heavy blogging this week, so here's a cute kid picture (as the featured image; click through if you're reading via RSS). This is SteelyKid and The Pip at play this morning, when they were back and forth across the yard a dozen times to pick up rocks from our gravel path and throw them into…
July 26, 2013
Some time back, I spent a bunch of time writing a VPython program that simulated the motion of a pendulum, which turned out to do some strange things. In the comments to that, there were two things worth mentioning: first and foremost, Arnoques at #5 spotted a small error in the code that fixes the…
July 25, 2013
The other day, I made a suggestion to one of my research students of an experiment to try. When I checked back a day later, she told me it hadn't worked, and I immediately realized that what I had told her to do was very stupid. As penance, then, I'll explain the underlying physics, which…
July 24, 2013
I've spent a bunch of time recently blogging about baseball statistics, which you might be inclined to write off as some quirk of a sports-obsessed scientist. I was very amused, therefore, to see Inside Higher Ed and ZapperZ writing about a new AIP report on women in physics (PDF) that uses…
July 23, 2013
I'm doing edits on the QED chapter of the book-in-progress today, and I'm struck again by the apparent randomness of the way credit gets attached to things. QED is a rich source of examples of this, but two in particular stand out, one experimental and the other theoretical.
On the experimental…
July 22, 2013
I'm starting to think that maybe I need to add "Work-life Balance" to the tagline of this blog, given all the recent posting about such things (but then, one of the benefits of having done this blogging thing for eleven years is that I know this is just a phase, and I'll drift on to the next…
July 20, 2013
After Thursday's post about sports and statistics, a friend from my Williams days, Dave Ryan, raised an objection on Facebook:
There's an unstated assumption (I think) in your analysis: that there is some intrinsic and UNALTERABLE statistical probability of getting a hit inherent in every hitter.…
July 19, 2013
The kids and conferences issue, discussed here a while ago has continued to spark discussion, with a Tenure She Wrote piece on how to increase gender diversity among conference speakers and a Physics Focus blog post on a mother who wound up taking her toddler to a meeting. There are some good…
