Category Archives: science

I Know What You Did Last Summer

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That was the unmentioned title of yesterday’s group meeting. We try to do this every year, and so one of the first meetings of the year is us sitting together, eating our lunches, chatting about ideas. We basically catch up, and chat about things we learned about from Summer travels, perhaps from conferences, schools or workshops. We also mention what we’ve been up to in terms of projects worked on, work in progress, etc. I find the latter especially useful from the standpoint of student development, since it is often the first time that a student gets to tell a wider audience (but in a safe environment) a little about what they are doing, often their first projects. Even a few minutes summarizing what you have been doing can be daunting at the early stages of your research career, so this is a good place to start.

Talking about things that we’ve learned are going on in the larger community (or […] Click to continue reading this post →

Scribblings

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Ack! It is September already. Somehow the last few days got away from me and I prepped a number of posts, but then they did not make it to the blog. One of them was another followup to the Friday iPad post (see also here). I wanted to show you one of the things I did in class on Wednesday. Recall that I am experimenting with using the iPad with Note Taker HD in class to simply sit with the students and work through solving problems with them on “paper”… a sort of fireside chat, if you will. The first experiment was on Wednesday, and I did it a little slowly at first, but I think it’ll be just great. Bear in mind I’m just scribbling with my finger here… I think I’ll try using the stylus I got the other day for variety. Click for larger versions.

classroom_chat_1 classroom_chat_2
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Time Travel a Click Away

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cvj_with_wormholeI just noticed that last week’s episode of The Universe on Time Travel, which I told you about here and here, is available online on their website. Click here to learn more about the ins and outs of it, and I show you how to make one too! Kind of.

It is a difficult subject to explain, and one that must be tempting to […] Click to continue reading this post →

I Gotta Get Me One O’ These!

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p-2048-1536-a738e2a5-eaa1-450b-9a0a-ed526300dc23.jpegSome of you will recognize the blue box in the picture on the left that I took recently while travelling. I have two things to mention in connection with it, but first let me mention that it is indeed what you think it is, but not really. In other words, it is in London (Earl’s Court), and it is a classic Police box (well, a modern relaunch), but it is not (as far as I am aware) also a disguised remarkable time machine owned by a somewhat eccentric renegade Time Lord. Ok?

Ok, thing number one. I don’t get the BBC America channel, but they kindly were dumping on to On Demand the episodes of the new season of Dr. Who, with the new writer and the new actor, so one day I thought I’d have a look. Just to get myself annoyed, because (sorry fans of its recent years) over the years I usually get ridiculously annoyed at how utterly stupid the show is, with lots of pointless running, and overacting, and cheap, crappy, silly plots and sets and so forth, and get even more annoyed when I remember it is mostly deliberate – we are supposed to enjoy the hokeyness in the spirit of nostalgia for the time many decades ago when it was on a super low budget but was ahead of its time. And I get more annoyed when I think that people abroad are watching this and thinking it is a prime example of great British television. Then I turn it off and ignore it for a year or two, and then do it all again. So anyway, I did that this time, back in the Spring. And guess what? […] Click to continue reading this post →

Entangled

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l-2048-1536-bceff628-4f08-4836-9001-d1f10349d0e7.jpegThis rather hot day sees me in more of a reflective mood, which is a rather good thing. I’ve been chipping away at the Project a bit, solving some issues concerning its final form, and looking around me and soaking up the Summer. I did some of that at Intelligentsia cafe before lunch, listening as I worked for a while to four filmmakers at the next table loudly plan a shoot, until I decided to switch to listening to music when it turned out that it was a porn film and they were exchanging ideas about what underwear the teenage star of the scene would be wearing and in what sequence it would come off. Don’t get me wrong, I’m not a prude, and certainly am not averse to underwear being removed in the right sequence and in the right circumstances, but it was distracting. And obnoxious. It is the price one pays for having coffee there instead of at Casbah, where the non-shiny people like me sit, mostly, but it is just too hot in the latter for me these days.

This is a very different day from yesterday, which saw me up at 5:30am, and then e-mail bouncing drafts of a paper back and forth with my collaborator Tameem all day until about 10:30pm, when we decided we’d done enough and submitted it to the arXiv. I focused on little else that day and did not leave my lair at all, so today is sort of an antidote to that.

Going on in background is a bit of preparation for the start of classes on Monday, the beginning of the new academic year at USC. I’ve been looking at a draft of a syllabus for the big class I’ll be teaching on introductory physics (for Engineering and Science majors). My class will have 100 students and the parallel one, taught by a colleague following the same syllabus, will be of similar size. So decisions about homework, grading policies, midterm dates, and so forth all need to be finalized by tomorrow […] Click to continue reading this post →

Perseids Galore!

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perseidmap_stripThe Perseid meteors are reported to be really good viewing this year.

As I said a few years ago in anticipation of a similar nice Perseid meteor shower:

Concerned that you don’t know enough astronomy? No idea in any amount of detail where these constellations are? Don’t worry! Basically, all you really have to do is find a place where the sky is reasonably dark, look [North] East, and wait. As your eyes acclimatise to the dark, and with a bit of luck, you’ll see some, and zero in on where to look.

There’s more at the NASA news site, from which I borrowed the image above. The peak is around these few nights (12th August or so) and there’s no moon, so if you’ve got some dark (ish) skies and a bit of patience, you should see some. Yes, this includes viewers in cities. Don’t be pessimistic. You might be able to find patches of dark enough sky, especially if you can go near to an edge of the city, or a park, and look away from the bulk of the lights. It does not have to be perfect viewing […] Click to continue reading this post →

Revisiting Shine a Light

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One of last year’s crazy Big Projects was filmmaking, you may remember. I just noticed that a little over a year has gone by since I premiered the first of the short science films I wrote, directed, co-produced… etc. Doesn’t hurt to look at it again. If you have a good connection, go to YouTube and select the option to watch it in HD and blow it up to full screen, and crank up the volume for the fun music!

Here’s Shine a Light:

It was brought to you by the NSF and USC’s iOpenShell Center. Visit the latter to learn more!

Don’t forget to share it! (Lots of people have viewed it (over 16,800 to date) shared it, and used it in their teaching, etc. It has been translated into a number of other languages, etc.)

Now, back to working on this year’s Project….

-cvj Click to continue reading this post →

Outshine

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l-640-480-d044a0bd-8d6a-4a37-af29-7487b2205058.jpegI gave my seminar at the workshop yesterday and said goodbye to friends old and new, colleagues, staff, and so on. Today is a hello to tourist mode, with me exploring aspects of Vienna. It is raining today, so it is a good thing that I’d planned to spend a lot of time looking at art indoors.

I’m resting in the cafe at MUMOK (Museum Moderner Kunst), between bouts of exploration of the exhibits. There’s a modern art and modern science (together, and of course modern means early 20th Century) exhibit on the upper floors. They have the usual chatter […] Click to continue reading this post →

Witten at Your Fingertips

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l-333-194-98891247-3696-41e6-97c7-386cb6dbeef9.jpegI just noticed, via this article at the Guardian, that not only has Edward Witten been awarded the Institute for Physics’ Isaac Newton medal, but his lecture at the ceremony has been posted online for all to see! See the link below. It is not often that you get an opportunity to see Witten, one of today’s giants in theoretical physics, on the public stage, to the extent that most people outside the field have not heard of him at all. The public view of who is driving forward and massively contributing to the field is rather skewed as a result of the number of appearances and grand pronouncements (often on subjects they’d be better shutting the hell up about!) from certain other renown theoretical physicists. So here’s an opportunity to hear from one of the true masters of the field.

When you speak to sensible people in the subject, whatever their own work is about and whether they like some of the things he works on or not (such as string theory), they will quite readily concur that he has done a huge amount for the field, driving forth many powerful ideas, sharpening the way we think about certain kinds of problems, conceiving of new ideas, and overall strongly influencing much of the basic manner in which practitioners think about the physics they are doing. Often, even if he is not the originator of a particular […] Click to continue reading this post →

The Scary Stairs

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l-2048-1536-655079d2-52f2-4383-962d-ae6e85ebb910.jpegThese stairs have a lot of significance for me. They are at Dartmouth House, just North of Piccadilly, in London’s Mayfair district. There you will find the home of the English-Speaking Union. The ESU is a charity that has an interesting history, all based on promoting friendship, communion and understanding amongst the English-Speaking nations and people of the world. This might seem an odd thing to build an organization on, but it might make more sense if you read the history. In any case, there are so many organizations of all sorts doing things, and in the scheme of things this is as good a reason as any to bring people together. The ESU administers a number of grants, fellowships, and scholarships, among other things, and one of them is the Lindemann fellowship. It is a one year postdoctoral stipend that you can get fresh out of your PhD, and it is designed to give young people a taste of America. It is highly competitive (only a couple are given out each year), and the final decision is made on the basis of an interview. You come up these stairs, all nervous and under stress since it is probably the first major interview upon which your career might depend, and the surrounding fancy parts of London may have helped make it all weigh a bit on your mind. You wait at the top of the stairs near the piano and listen for your name to be called and then you are ushered into the room and put in front of the interview panel.

I know this since I was here in 1992, being interviewed. I had set my sights on […] Click to continue reading this post →

National Academy

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As part of a report on a study (or several studies) I was writing last week (because evidently I can’t find enough things to keep me from making progress on the Project), I was including some data on the geographic distribution of members of the National Academy of Sciences within the US. The focus was on Physics, Astronomy, and Applied Physical Sciences. It was rather interesting, binned by state, especially if you grab the columns and tell Numbers to throw up a graph of it all. The concentrations are striking. I wondered whether the concentrations were simply following population, at least roughly, and so I went elsewhere and grabbed the population numbers for each state and ran that into a chart as well. I’ll leave you to draw your own conclusions as to the results. I find them interesting. Look at California, Texas, and Florida, for example. […] Click to continue reading this post →

The Universe Returns – In 3D!

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universe_glamour_shotSo I mentioned recently that we’d been filming for the fifth season of The History Channel’s The Universe, earlier this month and during some of the previous two. Well, I learned the other day to my surprise that the new season starts airing next week!

On Thursday 29th July at 9:00pm (8:00pm central, but check local listings) the first episode will air. It’s a survey of some of the wonderful things in our solar system. You can find a synopsis here.

Now do you remember that I did a post at some point about being filmed in 3D, and […] Click to continue reading this post →

Bad Universe

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Phil Plait of Bad Astronomy has announced what his super secret project has been. It’s a new science TV show for the Discovery Channel! It is called “Phil Plait’s Bad Universe”, and I imagine it’ll be a lot of fun and quite informative. There’s a trailer and some of his thoughts about the show here. I could not work out when it is going to air, so keep your eyes peeled*.

Enjoy!

-cvj

*Sorry. That’s such a dreadful image that phrase can sometimes project…
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Happy Higgs Hunting

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lhcb_z_bosonIn case you were wondering, things are moving steadily along in the search for the Higgs boson, and in the general ramping up to study entirely new frontiers of particle physics. I noticed a couple of interesting articles today that give you a nice sample. The first, by Dick Ahlstrom in the Irish Times, and is about the announced “rediscovery” of the W and Z bosons at the Large Hadron Collider, by a team working at the LHCb experiment. (I personally think that the term “rediscovery” is somewhat misleading since it makes it seem like the community forgot where they (the key signatures of the unity of the electromagnetic and weak nuclear forces at high energy) were since their discovery in the early 80s, but let me not quibble too much.) The point is that experimental teams are refining their searching techniques while sifting through all the new data being produced in the collisions at the LHC, and one thing you need to do before you begin to look for new things (like the Higgs) is to make sure you can find and recognize old things. Especially very important old things. […] Click to continue reading this post →

Emerging Gravity

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In the New York Times this week there’s an article* by Dennis Overbye on Erik Verlinde and his paper on the idea that gravity is not a force at all, but a consequence of thermodynamics. You can think of it as an extreme take on one of the directions a lot of the research (that I’ve mentioned a number of times has been going on in string theory) has been pointing, although I think it is safe to say that there’s a lot to be done on making the statement a concrete one that you can do physics with. I think it contains the germs of the right thing we’re all reaching for, but does not quite get there yet. We’re now quite routinely formulating some of the key physics of gravity entirely as physics of a completely non-gravitational dual theory – this is the content of what we call holography – and in particular the quantum physics of black holes in those settings get holographically mapped to the thermodynamics of the non-gravitational physics. This is the basis of the tools that we’ve been applying to studying aspects of phenomena showing up in various experimental systems in nuclear physics and cold atomic physics (and studies of phenomena relevant to various condensed matter systems are also being done). I’ve told you about a lot of this in various posts. (Some of them are listed below.) Running this the other way, the model non-gravitational systems (certain gauge theories at strong coupling and with large rank gauge groups) can be thought of as examples of how gravity (and space-time itself) is really an emergent phenomenon, appearing simply as […] Click to continue reading this post →