[Note: Originally posted on CV on 3rd October 2005. 65 comments on it here. Feel free to add new ones here.] ___________________________________________________________________________________ Below is a snapshot of a computation I was working on earlier this Summer. Will explain later. Spoke about it at the Southern California Strings Seminar. I’m curious … Click to continue reading this post
I’m in Lexington, Kentucky, for a couple of days to give three presentations at the University of Kentucky (or “UK” as everyone refers to it here – I hope that explains the previous post). I should be preparing two of them instead of blogging, but… you know how it is. Here’s how I got here:
On Wednesday afternoon, after a class on magnetostatics, and an attendance of a lunchtime event where four of our faculty (Biology, Geology, Cosmology (our very own Elena Pierpaoli!), Biology) presented their research, I dashed for a plane. Some hours later, at 10:45pm local time, I touched down in Chicago, and 15 minutes later was on the highway in the company (and car) of Nick Halmagyi.
Our mission? To hang out for a few hours in an excellent bar or two of his acquaintance and catch up on what’s been going on with each other, workwise and otherwise. The Charleston was indeed excellent, and (after chortling a bit about the memory of my annoyance at being charged $29 for a serving of a single malt scotch in a bar in Aspen during the Summer) proceeded to order the same here (he the Macallan, me the Talisker). At about 1:00am, the music stops and a guy with a face full of character sits down at the upright piano, is introduced to a scattering of applause, and proceeds to play some Chopin. Everybody shuts up and turns to listen. Appropriately, the piano sounds like all upright pianos in all bars all around the world sound (the tuning is just a bit wobbly), and the guy is good – really good. He stops playing the piece, and there’s some more scattered applause; someone (jokingly?) offers his a dollar as he walks away which he waves away enthusiastically; the music comes back up, and everybody turns back to their conversations. Nick and I continue to chat about various aspects of life, and order a couple more whiskeys.
At 1:25am or so we wander over to another bar. Nick seems a bit surprised by my suggestion to do this (‘cos I’m supposed to be going to sleep), but I’m just enjoying walking for a bit in the cold, wearing a cozy hat and coat that normally get no use these days, and there’s something nice about a proper bar hop in a neighbourhood with good bars and in the company of someone who appreciates it. This bar has an […] Click to continue reading this post
[Post reconstructed after 25.10.07 hack]: My first reaction was one of dismay mixed with amusement: (Taken from the Griffith Park Observatory. Click for larger view.) Surely the solution to the brown 800-plus acre scar in the landscape that was once a lot of greenery in Griffith Park visible from all … Click to continue reading this post
Finally. I never thought I’d see the day again. Finally and end to the seemingly perpetual sunshine. It has not been since March (unless I’m very mistaken) since there’s been any serious rain here, and more than five months since there’s been any officially measurable rain of any sort in Los Angeles (as measured by the official station down at USC).
I was beginning to despair a bit. I need rain, psychologically as well as for more mundane reasons like wanting my garden to get a good soaking. There’s something about the way my outlook on the world works that needs to have good rainfall sometime. Rainfall where I live, I mean. I’d seen some wonderful rain over the summer (almost daily afternoon thunderstorms in Aspen for a few weeks, nice rain and drizzle for a week in Cambridge), and that did help me with the waiting, but I’ve been needing rain at home.
Photo (added later): Griffith Park’s Mount Hollywood with the Griffith Observatory and rain-filled clouds above. Mount Lee with the Hollywood sign (just visible) is behind.
And so here it is! There’s the wonderful sound of it on the roof, and then there’s the […] Click to continue reading this post
So you’ve already read my opinion about the Bourne Ultimatum after I returned from seeing it on the opening night – (In short, it’s just brilliant!) Well here’s something related that is rather funny, especially if you are a football (soccer) fan, although that is not necessary (I have little or no interest in it myself). If you don’t already listen to Mark Kermode and Simon Mayo every week (most conveniently via their podcast), let me say right away that you should, since it is just an excellent and often highly entertaining discussion of film and movie releases. As a film reviewer, Kermode is not as good with words as, say, the New Yorker’s Anthony Lane (although it is not a fair comparison – the media are different), but his rants can be just great to listen to when he truly hates (and occasionally loves) something -whether you agree with him or not. Simon Mayo is sometimes thought of as his sidekick in this duo, but he’s really the anchor of the whole thing (and often the pragmatic link back to the everyday that keeps the whole show rooted), and from time to time the focus shifts to him. He’s also into his sports, while Kermode is not, which also makes for an amusing backdrop since the broadcast (on Radio 5 Live) is usually done live from some sporting context or other, which takes a sort of backseat role while they talk about movies. Anyway, it is an excellent podcast to listen to every week. I highly recommend it. You can find it on iTunes. (They also have started doing occasional video podcasts too, but the thing to go for is the radio show. – another convenience of it is the fact that you can keep the podcast until after you’ve seen the films if you like (this is what I usually do – I mostly prefer to not hear anything about a film before I see it), and then listen to it and shout at Mark if you so desire.)
As I mentioned, Mayo is a big sports fan, and his team, Tottenham, apparently got slaughtered by Crystal Palace and are now at the bottom of the premier league (can you tell I’m faking this and I’ve no idea what I’m talking about?) The next day, he’s interviewing (not with Kermode though) the director Paul Greengrass and the actor Matt Damon (both of the Bourne […] Click to continue reading this post
Yesterday (depending upon who’s counting) was the 16th anniversary of that thing we call the World Wide Web becoming a public entity. The Web is not to be confused with the Internet, which is much older, of course1. I’m talking about Tim Berners-Lee’s idea and implementation thereof. (I should not neglect to mention that this was done at CERN, the particle physics laboratory in Europe.) His original posting (on the newsgroup alt.hypertext) proposing the structure can be viewed here, and here’s an extract:
The project started with the philosophy that much academic information should be freely available to anyone. It aims to allow information sharing within internationally dispersed teams, and the dissemination of information by support groups.
Reader view
The WWW world consists of documents, and links. Indexes are special documents which, rather than being read, may be searched. The result of such a search is another (“virtual”) document containing links to the documents found. A simple protocol (“HTTP”) is used to allow a browser program to request a keyword search by a remote information server.
The web contains documents in many formats. Those documents which are hypertext, (real or virtual) contain links to other documents, or places within documents. All documents, whether real, virtual or indexes, look similar to the reader and are contained within the same addressing scheme.
To follow a link, a reader clicks with a mouse (or types in a number if he or she has no mouse). To search and index, a reader gives keywords (or other search criteria). These are the only operations necessary to access the entire world of data.
What am I going to do to celebrate?
Since everyday I celebrate the WWW by using it a lot, to commemorate the event I think I’m going to pay a visit to the (real, physical) library, then read a good old-fashioned book for a while, and then hand-write a letter. I used to write so many letters, long ago, and from time to time I try to stop everything and pick up a pen and write one. I got in the mood the other day while in Aspen, and went and found some letter-writing paper and envelopes, curled up on a sofa, and wrote for a […] Click to continue reading this post
Sorry about the silence. Odd thing: As a result of my (I think) growing absent-mindedness, it turned out that my flight was on Sunday night and not on Saturday night (as I thought when I did the previous post), so I suddenly had an unplanned 24 hours on my hands in Aspen.
I decided to spend the extra day lying low getting some work done – various things I thought would get undone on this trip suddenly had another chance to get done! Mostly administrative stuff. It is amazing how much one can get done when there’s a whole extra day suddenly appearing in your schedule, and so that’s what I worked on.
One thing I could have done was reminded you that the Phoenix was due to launch Saturday, and indeed it did! Be sure to check out a post about it on the Bad Astronomer with some links to really nice launch videos. The Phoenix mission plans rather wonderful things when the craft gets to Mars (including making the old reverse-thrust landing maneuver vogue again), as you can learn from their site.
Today, Monday, saw me running errands. Boring things, really. Things you do after being away from the nest for three weeks. Anyway, I’m trying to get to used to all the extra oxygen, and the unbelievable dryness. There’s still been no rain. I will miss the daily downpours and thunderstorms of Aspen. This leads me to the garden report. Nothing to say except that there’s been a bit of loss – the relentless sun and dryness […] Click to continue reading this post
[A friend of mine in LA told me today that she was planning to go with a group of friends to do some observing up at the big telescope on Mount Wilson. This put me in mind of a post that I did on CV two years ago (how time … Click to continue reading this post
Danica McKellar (the actress who played the girl “Winnie” in that show “The Wonder Years” that many of you might remember) has been working to try to encourage young girls to go more for “Cute and Smart”, as opposed to “Cute and Dumb”. Bottom line: Less Lindsay Lohan, and Paris Hilton, and more…. well, Danica. (I’m sure there are other Tinseltown examples here… can I have some help?).
Danica sets an excellent example of why the two (being considered attractive on the one hand, and smart on the other) are not mutually exclusive, while not suffering from the “geek” or “nerd” label that is attached by the entertainment industry to certain groups of people who enjoy using their brains a lot. She trained as a mathematician, in fact, doing her undergraduate work at UCLA so well that she did rather good published research work (NPR piece here – Update: It is actually more of a theoretical physics problem, it appears). This is from someone who struggled with the subject in sixth grade. Why is she in the news? She’s written a new book “Math Doesn’t Suck”, the aim being to encourage girls to avoid the (social) barriers to getting into mathematics. Excellent title. (I wonder if they’ll change it to “Maths Doesn’t Suck” if they publish it in Britain? “Suck” British kids have adopted from the USA cultural juggernaut, but “Math”? Not yet.)
Actually, looking at her site, I see that the full title appears to be “Math Doesn’t Suck: How to Survive Middle School Math Without Losing Your Mind or Breaking a Nail”, which is more of a mouthful, a bit less zippy, but oh well. It’s all very Clueless, in a good way. Here’s a link to the book’s site, and it is due out tomorrow.
There’s an article1 on her recent Newsweek quote at CNN, from which I grabbed this:
“When girls see the antics of Paris Hilton and Lindsay Lohan, they think that being fun and glamorous also means being dumb and irresponsible,” the 32-year-old McKellar told Newsweek for editions to hit newsstands Monday.
“But I want to show them that being smart is cool,” she said. “Being good at math is cool. And not only that, it can help them get what they want out of life.”
but you should go and read the whole thing, by clicking here. [Update: Much better article here, by Corey Binns in Good Magazine. Extract:
“The book hones in on middle school’s trickiest points-––like fractions, ratios, and percentages—and presents them in a style that’s appropriate for the cool kids’ lunch table. Figure out your “type†in boys and you’ll understand greatest common factors. All of those iced lattes celebrities drink make multiplying fractions tasty. Plus, savvy shopping requires killer decimal skills.”
]
Go Danica!
In other news, I learned2 that particle physicist Lisa Randall (author of the popular book with the curious title “Warped Passages”) appears in Vogue this month. Lisa […] Click to continue reading this post
The self-styled Cooper Street Brass Band playing for lots of ice-cream eaters at […] Click to continue reading this post
I stopped the previous post rather abruptly (I had to do another task and then run some errands) without getting to tell you a little twist at the end of the story. Here it is.
Having chipped away at the thoughts that Strominger’s talk stirred in my head for several days last week, scribbling equations to check that all I was thinking was on the right track (and chatting a couple of times with Nick Halmagyi), I decided that it was all fitting together so nicely that the framework and my extensions of it just had to be true. There was that feeling that it was too nice to be wrong, and it passed all the obvious checks I could think of. There were two independent consistency checks everything had to pass (using my way of formulating things) and they gave exactly the right results as required by the general setup, with no room for maneuver.
When that happens so nicely, usually at that point in thinking about a physics problem, a thought occurs to me. If I’m playing with a good idea and everything is working so well, then there’s at least 200 other people in the field who probably are also playing with it, and 199 of them have way more time than I do to think it through and write it up before I can. One should not really worry about these things in an ideal world, but I’d be lying to you if I said it did not come up as a concern from time to time. I’ve a history of having my thunder stolen out from under me several times in the field (and not always accidentally), so I’m a bit gun shy.
Anyway, I started writing a draft of the paper on Thursday the way I usually do: I write […] Click to continue reading this post
I’ve been spending the day so far as an administrator, and not a researcher, since I have to present the results of two committees’ deliberations at one of the big annual organizational meetings tomorrow here at the Aspen Center for Physics. So I’ve been gathering and arranging data in a presentable form. Enough. I will take a break and blog a tiny bit before turning to a truly riveting task – reviewing an introductory physics textbook for a publisher… (Sigh…it is not so easy to escape these things out of semester time.)
I had big plans to do a hike each day on the weekend, but physics intervened. I should explain a bit more. Earlier last week I eventually got around to following Nick’s suggestion from an earlier post to take a look at Andy Strominger’s Strings 2007 talk entitled “Search for the Holographic Dual of N Heterotic Strings”. It was the usual nice Strominger talk, where he motivates the physics very well, and presents interesting and clear 
thoughts on the problem in hand. I shall try to say a bit more about what it is about later on, but the general gist of it is that it is to do with understanding certain types of four dimensional black hole in string theory. As you may know, one of the extraordinarily successful results in string theory in the last decade (and slightly more) has been that we can understand one of the most central results of semi-classical quantum gravity -that they have an entropy and behave like thermodynamical objects (the work of Bekenstein and of Hawking from the early 70s)- in precise terms in the full theory of quantum gravity that string theory appears to present us with. This started with the work of Strominger and Vafa in 1996, that showed how to describe a large class of black holes as essentially made of extended objects called D-branes (about which I’ve spoken at length earlier1).
Just to fill in the gaps roughly: Hawking’s result that black holes can radiate as thermodynamical objects comes from taking Einstein’s theory of General Relativity and combining it with Quantum Mechanics in a partial way. He could not really do much better since there was no proper quantum theory of gravity at the time, but even in […] Click to continue reading this post
Some of the results of last Saturday’s wanderings. The wildflowers are in evidence nearly everywhere you look. Hiking through entire fields of them stretching off into the distance is such a pleasure:
The view toward Snowmass lake (you can just see it) that you can get from being on […] Click to continue reading this post
A strange but satisfying aspect of my time here (I’m at the Aspen Center for Physics, recall) has been the fact that due to some odd serendipity, there’s a ton of people from the “old days”. Which ones? My Princeton years, in the early 90s, as a postdoc at the Institute for Advanced Study (and later at Princeton University). These are not all people doing what I do, but in a wide range of fields such as high energy physics, astrophysics, condensed matter physics. Several of us were postdocs together. I’ve been chatting with people I’ve not seen for a while, sometimes not since those days, or they are people I met back then, and with whom I have a pool of shared memories from those days. So it has put me in mind of those times somewhat.
A quick example. Soon after I arrived last week, I was walking along, chatting with Petr Horava (Berkeley) about various things, and we got on to reminiscing a bit about our time together as postdocs in Princeton. And then minutes later, as though conjured from the very substance of our conversation, who should walk by but one of the Gods/Legends of the field (then and now), Princeton’s Alexander Polyakov. He walked by in exactly the same sort of way he would back then, either coming from or going to a walk along the river or canal, perhaps to give us a lecture. Petr and I looked at each other, and continued our walk and talk.
The great news for me last week was that Polyakov then gave a talk. I’ll admit to being a big fan of his physics. When he gives a talk nearby, I show up, no matter how confused I might end up at the end. There’s going to be good stuff in there – it’s only a matter of time before it sorts itself out in your head. Often years. Decades. Several of us sat in on his graduate class back in Princeton in the early 90s just to try to catch the pearls of wisdom which we’d pick up as he lectured on….. Well, I’ve no idea to this day what the class was really about. He would show up (probably fresh from a walk), with no notes or anything, and just pick up a piece of chalk, stare out the window for a few seconds, and then start writing stuff. Essentially, he was randomly jumping around the subject matter in his widely under-read book “Gauge Fields and Strings”. He was all over the book. It was not always a simple and coherent path through the subject matter, and it seemed that he was largely exploring whatever took his mood in the moment, but I suspect that was largely my ignorant young mind’s impression.
A. M. Polyakov in the middle of giving what for me was an excellent and intriguing seminar at the Aspen Center for Physics. Click for larger view.
Sadly, it is the type of course that these days would score close to zero in most […] Click to continue reading this post
[Updated with a bit of video!]
Earlier this week I went for a walk with Nick Halmagyi to chat about physics, and since he had not been down to the meadows and gardens over by the neighbouring Aspen Institute, we wandered down that way. It was just after lunchtime, and a very hot day, and as we got near the Institute, we diverted away from physics so that I could tell him briefly what the significance of the Aspen Institute is. I explained that it was an important “think tank”, host to thinkers in the humanities, sciences, and diplomats, presidents, ex-presidents, and other dignitaries, who come and think great thoughts about the problems of the world. Well, let me use their own words from their website:
The Aspen Institute, founded in 1950, is an international nonprofit organization dedicated to fostering enlightened leadership and open-minded dialogue.
As an example, I explained, it is probably the sort of place that Al Gore might have come to in order to think deeply about the environmental issues he champions. It is nice that the Aspen Institute is right next to the Aspen Center for Physics, and the two organizations, while now independent (but the Center actually grew out of the Institute, see here) sometimes work together on various matters including public outreach. The public lecture I gave here last year as part of the Heinz Pagels Memorial Lecture series (see e.g. here and here), for example, was actually over in the Paepke auditorium, one of their buildings.
We approached the main grounds of the Institute, near their residence buildings, and were greeted by a most frustrating -and ironic- sight. Their sprinkler system was fully on, spraying water unnecessarily into the air and onto the asphalted walks, with some making it onto their lawns, where even there it would mostly evaporate (in addition to aiding the hot sun in scorching the grass somewhat). For once, I did not have my camera and so cannot share this horrible sight with you. For a moment it was as though I was back in LA, but this was Aspen, where everyone talks about the environment. Then I remembered – everyone talks about the environment. At the same time, there are more and more SUVs every time I come here (rental companies even try to force SUVs on you when you try to rent a regular compact car – did you read my story of that last year?), more and more land seems to be cleared to build ever-larger houses, and so forth. On the other hand, bicycle use is very high here, there’s an excellent free bus system, an enforced reduction of individual car access to the Maroon Bells wilderness area, and I imagine several other worthy environmental efforts that I have not seen are being made. So it is a tale of two communities and mind sets. It’s complicated, as with any populate. But you’d have thought the Aspen Institute would be “fostering enlightened leadership” by not watering their lawns and (sidewalks) with vast amounts of water at the maximally worst time of day to do so in terms of effectiveness. (Frankly, given the environmental disaster most lawns are, one could go further and hope that in the spirit of leadership, they’d turn more of their expanse of lawns into other use, perhaps expanding the excellent wildflower garden they have in one corner, or letting more of the surrounding meadows repopulate the grounds. It could be rather beautiful.)
Anyway, we shook our heads at the irony of the sight and we wandered off toward the river, continuing our chat about matters in other dimensions (no, really). The next day I came back at that same time to check the sprinklers again (with camera), since such systems are often on timers, but had it rained very heavily the previous night and so -happily- it did not seem that the sprinklers had been used.
On Wednesday I returned once more. The sun was overhead and strong again (not as much as Monday) and the main system was not on. But once again I noticed signs of watering, and saw a smaller component of the lawn being watered by a hose-driven system. I now think that it might be that they were sprinkling (well, gushing) on Monday (and partly on Wednesday) in the mistaken belief that pouring water (and into the air, where it rapidly evaporates) on the lawn while the sun is baking it will somehow help, and they did it on an ad hoc basis, but I can’t be sure. Either way, it is a terrible waste of water resource by an organization that is committed to leadership in matters of importance, such as the environment.
Then I noticed that many people wearing name badges were heading from the Institute toward the direction of the auditorium and the Aspen Music tent. This fit with the next deliciously ironic thing: Al Gore was going to be talking! He’d been at the Aspen Institute (I’d no idea of his presence or the event until a radio announcement on Wednesday morning), and the sprinkler matter, this was remarkable. Convenient, one might say.
It turned out that it was not taking place in the Paepke auditorium, as I thought it […] Click to continue reading this post
