Physics
drorzel | March 18, 2015Yesterday's quick rant had the slightly clickbait-y title "GPAs are Idiotic," because, well, I'm trying to get people to read the blog, y'know. It's a little hyperbolic, though, and wasn't founded in anything but a vague intuition that the crude digitization step involved in going from numerical course averages to letter grades then back to multi-digit GPA on a four-point scale is a silly addition to the grading process.
But, you know, that's not really scientific, and I have access to sophisticated computing technology, so we can simulate the problematic process, and see just how much…
esiegel | March 17, 2015Imagine that you've got that absolutely weightless feeling, the kind you get when you lose your balance and hurtle towards the ground. Are you on a roller coaster? Did you fall out of an airplane? Or are you in an accelerating elevator?
Image credit: Dutch Experiment Support Center, via http://www.descsite.nl/Gravity_us.htm.
According to Einstein's Equivalence Principle, there's really no way for you to tell, not unless you've got some view of the outside world. What you might not realize is that there's an assumption at play here: that the kind of mass you experience due to gravitation…
drorzel | March 17, 2015I keep forgetting to mention these, but I have two talks coming up:
1) Tonight, March 17, I'm talking about Eureka to the Mid-Hudson Astronomical Association on the campus of SUNY New Paltz. This is a version of the talk I gave in Bristol, UK over the summer, but with the soccer content replaced with American football.
2) Next Thursday, March 26, I'll be giving a Forman Lecture as part of the Vanderbilt University Physics Colloquium (following in Rhett's footsteps...). This is going to be a revised version of the social-media talk I've given in the past. I need to blow that up and put it back…
drorzel | March 12, 2015It's winter, and as usually happens in winter, I'm having a hard time opening the gate to our back yard. Why? It's not the snow, it's physics.
We have a standing policy that as much as possible, Emmy goes in and out through the back door for walks and small-animal-chasing in the backyard. This has occasionally been lifted, when a tree limb fell on our back gate, and when they were building the deck, but for the most part, when we had to go in and out through the front door, but she mostly knows not to go charging out the front door, which is the whole point.
Access to our fenced back yard is…
esiegel | March 11, 2015“Every time we get slapped down, we can say, ‘Thank you, Mother Nature,’ because it means we’re about to learn something important.” -John Bahcall
And what's possibly more important than learning how the Sun works? For nearly all of human history -- well into the 20th century -- we really didn't know.
Image credit: NASA, ESA, and G. Bacon (STScI).
Could it have been combustion, like we see on Earth? Or perhaps gravitational contraction, like that which powers white dwarf stars?
No, it turned out to be nuclear fusion. Yet when we built our best models and went to test what we expected to…
drorzel | March 11, 2015Kate's a big consumer of audio books, but I've never been able to listen to them. About five minutes in, I doze right off, every time. However, I know there are a lot of folks like Kate who love audio books and listen to them while commuting, so I'm very happy to announce that Audible is now selling an audio edition of Eureka.
This is the first of my books to get an audio edition, which is cool-- we actually sold audio rights to the first one, but I guess after they paid for it, they discovered that it has a whole bunch of pictures that are kind of integral to the book. At least, I'm guessing…
drorzel | March 9, 2015
Two roads diverged in a yellow wood, And caused me no small amount of panic For traveling both of them would be good But there simply was no way I could Until I remembered quantum mechanics.
So half my wavefunction I sent left And rightward steered the other half Both pieces of me with equal heft And thanks to calculations deft, I knew the end would sum both paths
Plenty of physicists claim to know Or at least will confidently speculateThat collapse, or a pilot wave's flow, Or decoherence act to make it so. Me, I just shut up and calculate.
So in the woods I went two ways To return together…
drorzel | March 6, 2015I've updated the detailed blog post describing our summer workshop introducing writers to quantum physics to include a link to the application form. For the benefit of those who read via RSS, though, and don't follow me on Twitter: the application form is now live, and will be for the next few weeks. We expect to make acceptance decisions around April 1.
So, if you make up stories and the idea of spending a few days at the Joint Quantum Institute learning about quantum physics from some of the world's leading experts sounds like fun, well, send us an application.
drorzel | March 6, 2015There was some Twitter chatter the other night about a new arxiv paper called The Gender Breakdown of the Applicant Pool for Tenure-Track Faculty Positions at a Sample of North American Research Astronomy Programs:
The demographics of the field of Astronomy, and the gender balance in particular, is an important active area of investigation. A piece of information missing from the discussion is the gender breakdown of the applicant pool for faculty positions. For a sample of 35 tenure-track faculty positions at 25 research universities advertised over the last few years in astronomy and…
esiegel | March 5, 2015“Science enhances the moral value of life, because it furthers a love of truth and reverence — love of truth displaying itself in the constant endeavor to arrive at a more exact knowledge of the world of mind and matter around us, and reverence, because every advance in knowledge brings us face to face with the mystery of our own being.” -Max Planck
When it comes to our Universe, you might think we understand it pretty well. We have a full list of particles we know to exist, we understand the forces that describe their behavior, and we've been able to detect and measure each and every…
drorzel | March 3, 2015
A few years back, I became aware of Mike Brotherton's Launch Pad Astronomy Workshop, and said "somebody should do this for quantum physics." At the time, I wasn't in a position to do that, but in the interim, the APS Outreach program launched the Public Outreach and Informing the Public Grant program, providing smallish grants for new public outreach efforts. So, because I apparently don't have enough on my plate as it is, I floated the idea with Steve Rolston at Maryland (my immediate supervisor when I was a grad student), who liked it, and we put together a proposal with their Director of…
drorzel | March 2, 2015While I'm running unrelated articles head-on into each other, two other things that caught my eye recently were Sabine Hossenfelder's thoughts on scientific celebrities (taking off from Lawrence Krauss's defense of same) and Megan Garber's piece on "attention policing", spinning off that silliness about a badly exposed photo of a dress that took the Internet by storm.
Like Sabine, I'm generally in favor of the idea of science celebrities, though as someone whose books are found on shelves between Lawrence Krauss's and Neil deGrasse Tyson's, there's no small amount of self-interest in that.…
drorzel | February 26, 2015There have been some good comments on last week's post about the Many-Worlds Interpretation, which I find a little surprising, as it was thrown together very quickly and kind of rant-y on my part, because I was annoyed by the tone of the original Phillip Ball article. (His follow-up hasn't helped that...) But then maybe that's why it succeeded in generating good comments. Tough call.
Anyway, I let these slide for a while because of day-job stuff, so I'm going to promote this to a new post, and try to address some of these. Because, apparently, we are never out of universes in which I'm…
esiegel | February 25, 2015“End? No, the journey doesn’t end here. Death is just another path, one that we all must take. The grey rain-curtain of this world rolls back, and all turns to silver glass, and then you see it.” -J.R.R. Tolkien
No matter how well we care for our bodies, they eventually wear down, give out, and we all will someday face death. Yet if there's anything to be learned from looking at the physical Universe, there's no reason to expect that death is truly the end.
Image credit: NASA/ISS Expedition 28.
Every time a star runs out of fuel and dies, no matter what type of star it is or what fate it…
drorzel | February 25, 2015Paige Brown Jarreau, who blogs at From the Lab Bench is in the throes of writing her dissertation about science blogging, and plowing through a lot of interview data. She's sharing some of the process on the blog, and a lot more on Twitter, where it's prompted a good deal of discussion.
One of the big things she's brought up recently is the question of why scientists seem to blog about their own research only on rare occasions (Storify link). My own answer is in there somewhere: blogging about something you're actively working on doesn't feel like a departure from doing work. If you're going…
esiegel | February 24, 2015No one science can stand wholly on its own. For inquiry about the Universe to give a correct, complete picture, it requires that we bring in a whole slew of evidence, often from tangentially related fields.
Image credit: Professor Kenneth R. Lang, Tufts University.
The interplay between three fields in particular -- astronomy, physics, and math (not a science, but the tool used to help understand the relationships arising in the first two) -- have given rise to the most successful picture of the Universe of all-time.
But how did this come to be?
Image credit: Scott Dodelson.
Brian…
drorzel | February 24, 2015There's a new-ish book review podcast covering pop-science books, BookLab, hosted by Dan Falk and Amanda Gefter, and their latest episode includes my Eureka as the third of three books being discussed (a bit more than 40 minutes in, though their discussion of the other books is also interesting...).
It's sort of an odd experience listening to other people talking about my book; most of the audio I've heard about it is listening to my own interviews, where I'm actively participating (I recorded another radio interview yesterday; not sure when it will air, but I'll post a link). Happily, they…
drorzel | February 24, 2015I'm rooting around in my bag for a pen, and pull out a laser pointer by mistake. Since I'd really prefer not to be grading, I flip it on and shine it on the floor next to the spot where Emmy is half-dozing. She immediately leaps up (she's pretty spry for a dog of 12...), and pounces on it. Or tries to, as I flick the spot across the room.
"Get the dot! Get the dot! Getthedotgetthedotgetthedot!" she mutters as I lead her on a lively chase around the room. After a few minutes, I click the laser off, and put it down. Emmy comes over, panting, and I scratch behind her ears.
"That was fun, eh,…
drorzel | February 23, 2015A sort of follow-up to last week's post about the STEM "pipeline". In discussions on Twitter sparked by the study I talked about last week, I've seen a bunch of re-shares of different versions of this graph of the percentage of women earning undergrad degrees in physics:
Fraction of BA/BS degrees in physics awarded to women over time. From AIP Statistical Research.
You can clearly see that after a fairly steady rise through the 80's and 90's, this trend has flattened out over the last decade. If you crop the horizontal axis to start in the early 2000's, you can actually see a decline from…
esiegel | February 22, 2015“The only frozen heart around here is yours.” -Anna, to Hans, from Frozen
When something's difficult, it's easy to lose sight of what's beautiful. Have a listen to Eilen Jewell's haunting and memorable song,
Fourth Degree.
Next, before you curse the bitter cold yet again, particularly those of you suffering from far below average temperatures, consider the following beautiful sights.
Image credit: Cheryl Johnson, via https://www.facebook.com/cheryljohnsonnh/media_set?set=a.10203684200845….
These frozen baubles aren't leftover Christmas decorations that were left out in the snow, but are…