Category Archives: science

Tales From The Industry XXXII: A Matter of Time

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patzcuaro_clocksHere are some clocks I saw at the House of Eleven Courtyards (Casa de los Once Patios) in the historic town called Pátzcuaro (at the aforementioned lake of the same name). It was a convent, and is now a place to go and see lots of arts and crafts in action, as well as buy some. The clocks, housed in copper, mark the entrance to an entire room of copper workmanship in various forms.

The clocks have reminded me to give you an update on something else. Through some of May and June, I did a lot of work for the show The Universe, which airs on the History Channel (as you probably already know from reading here over the years. See here.). There will be, as usual, several topics covered over the upcoming season, and it will be interesting to see how the various filmmakers put together their episodes. It is worth noting that the History Channel have done something remarkable here. This is now the longest run that any cable channel has had for a science show. They built an audience with a solid show, and kept producing good episodes and gathering more (and it is worth saying, an admirably diverse set of) viewers over the years.

In fact, the show has been so successful that they are going to, I predict, pay an […] Click to continue reading this post →

Street Invasion!

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cyclovia_morelia_3On Sunday in Morelia, Mexico, I was walking along the main street near my hotel and it seemed that something unusual was going on. The street was empty of cars, and some sort of event was going on. I saw a few cyclists here and there in the distance, but not the sort that look all hardcore and determined to go fast and determinedly on their way, but instead the more leisurely stop-and-smell-the-flowers sort. I wondered almost immediately if I had run into a local ciclovía, and a few minutes later, a sign confirmed this. Wonderful!

I’ve been waiting for such a thing to come to LA for a while now, since I heard of it last year when I part (and presented) in a public discussion downtown at the Artwalk about bike issues in the city, and had heard that it was becoming more widespread (it started in South America – Colombia) but it was an unexpected treat to find one right outside my hotel room! Here are three more picture. Click for larger view.

cyclovia_morelia_1 cyclovia_morelia_2 cyclovia_morelia_4

It was great to see lots of people out and about just using the streets with no cars […] Click to continue reading this post →

Scenes from School

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unam_astro_math_mexico_2Well, my work at the Quantum Gravity school over (see previous posts here, here and here), I hopped on a plane yesterday, in order to return to Los Angeles. It was an excellent time. I enjoyed being in Mexico again, and seeing a new part of it (see posts to come), and the school was well organized and very enjoyable. The students were very receptive overall, and I spent a huge amount of time chatting with them about physics between sessions, over lunch, and on the bus back and forth between the campus and the city (and on the excursion on Sunday for a while). A number of students seemed very interested in some of the quantum gravity phenomena that are possible to describe using string theory – surprised in most cases (since the background independence issue that keeps being waved about by some as a naive (in my view) and bluntly used principle seems to have served as a block to many) – and it was a pleasure to be able to open them up to new physical ideas. It worked pretty well because I gave them three lectures on the basics of string theory, and so could build on that material in the one to one discussions to explain more detail.

lunch_waiting_unam_mexicoDynamical changes of spacetime dimension is one thing that captured a lot of interest, as well as string theory’s various ways of showing in model examples how spacetime is an emergent, classical approximation to an underlying quantum description that does not have manifest spacetime geometry. The latter is something that all approaches to quantum gravity hope to realize in one way or another (since those sorts of ideas and fantasies about what quantum gravity should be appeared in the mid 20th Century), and exactly how it emerges in string theory is a beautiful story. Who knows, perhaps they will take these hints from string theory about how quantum gravity can work and develop them […] Click to continue reading this post →

Minority Report

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This is a quick update on the school. I’ve been trying to give the students some of the core concepts they need to help them understand what string theory is, how it works, and what you can do with it. Here’s the really odd thing about all this (and an explanation of the post title): While this is a school on Quantum Gravity, after talking with the students for a while one learns that in most cases the little they’ve heard about string theory is often essentially over 20 years out of date and almost always totally skewed to the negative, to the extent that many of them are under the impression that string theory has nothing to do with quantum gravity at all! It is totally bizarre, and I suspect it is largely a result of things that are said and passed around within their research community.. So there […] Click to continue reading this post →

Arrival

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(Anyone remember Mike Oldfield? I recall a lovely piece of music of his with the same title as this post and it has now been playing distantly in my head as I type…very pleasant.)

Well, I’m sitting at an outside table across from the main square with the cathedral and having a simple lunch. It is hot, and so I have a glass of cold pale beer in front of me, and everyone around me is speaking Spanish. This feels like it could be that I am back in Madrid, but in fact I am in Morelia, Mexico. (I can tell because, among other things, I’ve never been offered a shoe shine quite so many times in the space of 15 minutes…) It is quite a lovely place, as far as I’ve seen so far (I’ve not explored much yet). I’m resting after a very early morning travel schedule which saw a slight panic (er…long story) at LAX to catch my flight which left just before 1:00am. The seats were fixed to the bolt upright position the whole flight and so the two and a half hours I’d planned to snooze were not so […] Click to continue reading this post →

Summer School Prep

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So, it is that time of year.

I’ve got to give three introductory lectures on string theory in a Summer school somewhere in Mexico next week. So I must break away from intense work on The Project (which is going well, so maybe you will hear about it sometime soonish(ish)….) and focus on how to cram all the cream into three comprehensible and useful lectures. I hate overdoing the “it can be shown” line that ends up making the whole thing seem like magic (as is so often done), so this is always a challenge. Here’s how my preparation usually goes (and indeed it went this way this week): […] Click to continue reading this post →

A Treasure Trove!

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As I’ve mentioned before, I listen online to Radio 4, one of the BBC radio stations I love for its variety, breadth and depth of programming. Between it and NPR affiliate KPCC, my day is usually rather full of (spoken-word) radio of a wide variety. I’ve noticed that Radio 4 has been doing a programme called “A History of the World in 100 Objects”. The Director of the British Museum does a 15 minute programme on each of 100 objects and talks about aspects of its historical significance. (If you think you don’t like history (maybe bad experiences in school or something like that) this might be a great way back into the subject for you. Not liking a subject is usually, I find, an issue with how it was presented to you and not with the subject itself.) It’s a lovely way of quickly plugging into aspects of world culture in interesting ways, and rather reminds me of the short series that we here at USC in the College Commons called The Cultural Life of Objects, organized by my colleagues Anne Porter and Ann Marie Yasin. (See also the Collections event, and my post about it.)

The BBC series is about half way now, and it has been quite wonderful. I strongly recommend it to you. Here’s the marvellous thing: The entire series can be podcast […] Click to continue reading this post →

Laserfest Videos

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laser_beamI think I mentioned a while back that as a celebration of the 50th anniversary of the Laser, there was a video competition on Physics Central to make a fun video about the Laser. They were put on YouTube (tag is laserfest, I think) and then there was voting at some point (I imagine), and winners were chosen. You can see them here. Congratulations to the winners!

Actually, I think the whole playlist of Laserfest video entries is here, and you can jump through them by clicking the link to the next one in the top right hand area.

Are you aware of Laserfest, by the way? Go and check out the website and join in the celebrations of the Laser!

I should mention that the competition has all meant good news for my work as well. I […] Click to continue reading this post →

Planck Matters

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You can read a bit about the work of my colleague Elena Pierpaoli and her postdocs and students in this article in one of USC’s in-house publications. It focuses on the Planck observatory (image right from NASA/ESA), which we’ve discussed here before. (Recall the launch?) There’s a lot of exciting physics about the very young universe to be discovered as more data from the mission get gathered and analyzed.

Enjoy the article!

-cvj Click to continue reading this post →

Understanding Artificial Life

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You’ll remember the recent announcement about the first synthetic life form, created by team Venter. But what does that mean, really? How truly synthetic is it really? What aspects of Nature needed to be input in order for it to be viable? Too much for it to be called truly synthetic? What dreams are out there to do better? What’s the science behind such a challenge? How did the mechanisms for life that we know know actually evolve, and what steps are adjustable or reproducible?

These questions and many more are addressed in a lovely special edition of BBC […] Click to continue reading this post →

Organized Skepticism

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(The title is an important way of thinking about what science is all about, at least in part. It is one of the things mentioned and discussed in the lectures discussed below.)

martin_reesThe annual Reith Lectures at the BBC over in the UK are under way. This year, they are given by a giant of astrophysics, Sir Martin Rees. I strongly – very strongly – recommend listening to these lectures. There are four of them. Of the senior superstars of science who I’ve come to know a little, Martin Rees comes across as one of the most gentle and quietly thoughtful I can think of while at the same time being sharp and insightful on all sorts of aspects of science (not just the confines of his field). I mention these characteristics since they are of great value to me – I tend to be repulsed by the practitioners of the more arrogant style that is also common in prominent (and not so prominent) scientists, no matter how good their science might be. He’s the President of the Royal Society, the Astronomer Royal, and the Master of Trinity College (Cambridge), among other distinctions, and so naturally is called upon to express views on a range of topics about science, including how it intersects with society.

Indeed, the intersection between science and policy issues and society is the subject of the first of his lectures. The whole series is called “Scientific Horizons”. The first […] Click to continue reading this post →

CDF Says No

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Recall the excitement last week about the D0 result? I wrote a post called “An Exciting Asymmetry?”. Well, there’s a rule that says if you write a title as a yes/no question, the answer is often (usually?) “No”.

Sure enough. over at Resonances, Jester reports that the CDF experiment, also at the Tevatron, has looked for a confirmation of the CP violating result that D0 claimed to see, and did not find anything abnormal where it should have. Find further details (on the technical side for the experts) and links at that post, which, as is usual with material from that blog, is well-written and interesting.

This is one reason why we (the particle physics community) build multiple detector/experiments on the same accelerator machine, and this is a prime example […] Click to continue reading this post →

Another Hole in Pandora’s Box?

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05classic05lNo doubt you’ve heard it all over the news. Craig Venter and his teams have created another press storm, this time about “synthetic life”, although I wonder a bit about the meaning of the term. I’ve no particularly insightful things to say about it all, other than to do like everyone else and watch and wonder where it’s all going to lead (probably not exactly where people currently think… is one thing we can say for sure). There’s coverage everywhere so I don’t need to point, but for future reference, here’s a Guardian link to a video of the man himself talking about it in some detail, and a link to a story by Ian Sample in the same paper. There you can find links to the research paper too. (Image at right is of a pithos, the kind of vessel Pandora opened in the Greek myth. The image is from the online component of the Michael C. Carlos museum at Emory university. Click image to jump there.)

Truly fascinating stuff to say the least.

-cvj Click to continue reading this post →

An Exciting Asymmetry?

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A big mystery in physics is why there is more matter than anti-matter. (Of course, which we call the matter and which we call the “anti-matter” is a… matter of convention. Take your pick.) It is hoped that there is some mechanism in the laws of physics (at a very basic level concerning particle interactions) that will become apparent that explains it. It’s also hoped that the mechanism itself might have some understandable origin too. The mechanism would operate in the first tiny fractions of a second of the universe’s life when the primordial soup of particles and antiparticles (created from, roughly speaking, the energy of the big bang) began to cool down as the universe expanded. Rather than them annihilating all back into energy again, the mechanism would create an imbalance between the two, giving rise to a matter-filled universe, from which we emerged. So what could be the mechanism, can we isolate it in our theories and in our experiments? Build a good model of it? Explain it?

This is all very first and foremost in people’s minds when there’s a new experiment switched on that is probing the unknown – the Large Hadron Collider. Well, actually, it has been recently announced that a suitable mechanism (or, more precisely, its […] Click to continue reading this post →

Venus at Midday!

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[Update: That really hurt. Hard on the neck. And could not even find the moon… I think there’s left over moisture haze high up. 🙁 ]

I just learned from Phil’s Bad Astronomy blog that apparently there’s a great opportunity to see Venus right in the middle of the day, and today is rather optimum for it. I’m going to try and see if it works. At about 1:00pm (sorry those of you for whom the sun has already gone way past that), look for the sun and then the thin crescent moon will be about three fist-widths to the left of that (if in the Northern hemisphere – right otherwise). Venus will be visible just to the right of that crescent. Phil has a diagram up on his site, here. This is all supposed to be possible with the naked eye, and I imagine you can help things a lot by holding your palm up against the sun to stop the brightness from that direction, and then waiting a bit for your eyes to relax into the viewing of the area of the sky I mentioned. Phil also mentioned binoculars. I’d seriously suggest trying without them, if you can, since accidentally looking at the sun with them is something I want to strongly urge you to avoid. (If you must use them, put something like a building or a large tree trunk in front of the sun and don’t change your footing…)

Good luck! I’m going to try in a couple of hours. Let me know how it works out for you, if you like!

-cvj Click to continue reading this post →