Author Archives: Clifford

A Man Out Standing In His Field

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Two of our colloquia this semester were concerned with work very much in the public eye this year. The first was from Francis Bonahan of the Mathematics Department here at USC.

F bonahan colloquium

He talked about the work that won the Fields medal – the proof, by Grigori Perelman, of the Poincaré conjecture. Or better, I should say the work toward the proof, since the citation does not explicitly mention the conjecture, but his larger body of work. (MathWorld link, Wikipedia link.) In fact, Francis spoke about a lot more than just the Poincaré conjecture. He talked about the larger setting in which that work fits, something mathematicians call the “geometrization conjecture”, which Mathematicians care a lot more about. Perelman’s work does more than just prove the Poincaré, it addresses the whole (3-)ball of wax, so to speak. He told us quite a bit about that in the talk, spending most time talking about what they were and how they fit into the scheme of things, rather than […] Click to continue reading this post →

Twelve Days of Physics

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This morning I received an email from someone called “Grrrl Einstein” today which read:

I am creating a Physics Calendar for the Holiday season, and I am including twelve entities. So far I have:

  1. Newton’s Laws
  2. The Dirac equation/Schrodinger equation
  3. The Clifford Algebra defining the Dirac gamma matrices
  4. E=mc2/Einstein’s equations/postulates and/or some solution of them, such as the Schwarzschild solution
  5. The principle of least action
  6. Maxwell’s equations
  7. E=hv
  8. The Yang-Mills Lagrangian
  9. The Schwinger-Dyson equations or something else related to functional methods
  10. Stokes’ Theorem
  11. Entropy

What would be a good String Theory equation to round it out? Any things I should include/exclude?

She also says: […] Click to continue reading this post →

Copernican Reality

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Well, you’re sitting there at the desk, so might as well put on the radio to keep yourself company. Do in on the web, and I suggest that you listen to:

Radio Lab episode #205

This one was about Space. It has a lot of good stuff in it, and excellent speakers, very good clips, and playful (rather successfully, surprisingly often) presenters. My favourite bit? Neil DeGrasse Tyson being interviewed about our place in the universe. If you’re not an expert on the anatomy of the idea, please have a listen, since this is one of the best (and quite funny) layperson’s quick descriptions I’ve heard on the subject.

Tim Ferris (on the unlikelihood or likelihood of travelling vast distances for expeditions in space) and Brian Greene (on the geometry of our universe – another good layperson’s level chat) are also in this segment, just before. Direct mp3 file link to that particular piece here.

-cvj Click to continue reading this post →

Some Observations at Griffith Observatory

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So I must apologize. I went to the preview of the Griffith Observatory so long ago now and did promise to blog about it with more than just one nice picture, but it did not happen. Partly because I had to go back across the Atlantic to do some work, and then got ill over the weekend I was planning to do it, and then…

Griffith Observatory

Anyway, here are some of my thoughts. First note that my two week delay means that this is no longer a scoop, since even the LA Times had a spread on the whole thing on Thursday. A rather nice one as well. I urge you to consult it for a lovely pull-out graphic of the whole site. There is also a special website with picture tours, nifty 360 degree interactive shots of the spaces, and other information. The Griffith opened yesterday.

What they’ve done over the last four or five years is simply shut down the entire building and rethink and redo a great deal of it. How to preserve the lovely 70 year old landmark, while making it even better? Simple question – simple answer: Get $93 million for your project (I find this number, the earth-sun distance in miles, suspicious), and then go underneath the existing building and hollow out about the same amount of space that is has, but underground. Fill it with lots of goodies. And I mean lots and lots. What goodies? We’ll see. […] Click to continue reading this post →

Fashionably Deconstructed

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Spotted in the windows of a Department store (Hermes?) in Dublin (click for larger):

[image]

They are trying to invoke a car that has been taken apart and draped with hermes 2 splendid clothing to form the display. In the picture below (click for larger), the second window’s oil can, in the carefully chosen-to-match colour, is a […] Click to continue reading this post →

Memories, Physics, and Celebration

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It’s a pleasantly foggy morning here on the USC campus. It is 7:00am now (at least at start of writing), and it will all burn off in a few hours, I imagine, to reveal the sunny sky waiting for us. But right now it reminds me of the Cambridge morning of a couple of weeks ago. A foggy Saturday morning in fact. I took that photo of the spider web I used on Halloween with that mist in the background.

That Saturday of celebration of Andrew’s work (The Andrew Chamblin Memorial Conference) at Cambridge was a remarkable experience. I was exhausted through a good deal of it, since I had eight hour jetlag, but I’m so glad I went, and that I could contribute a talk. I met many old friends and colleagues, drawn mostly from the UK and European side of Andrew’s collection of friends, collaborators, and admirers in the field.

andrew chamblin memorial conferenceThere were talks by former collaborators of Andrew’s: Gary Gibbons, myself, Roberto Emparan, Robert Caldwell, Raphael Bousso, and Stephen Hawking (who also guided some of Andrew’s thesis work). Gary, in “Discrete Symmetries and Gravity”, talked about Andrew’s early Oxford and Cambridge work on various discrete symmetries in physics, particularly those of a geometrical origin. He’d played with various ideas in this context, including some applications to problems in […] Click to continue reading this post →

Promises, Promises

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Due to travel, work, and illness, I’m very behind in a number of posts I was hoping to have brought to you by now. I’m planning a big session of playing catch-up tomorrow, and so please accept my apologies for the lateness of some things I promised.

Until then, I’ll leave you with another lovely Peter Goin “Narrative Photogram”, part of the series that I showed you before at the Metro/7th Subway stop on the Red Line.

[image]

They’ve put a lot of effort into those subway stations. Not nearly enough people use them or even know about them, even though they live and work in the city. Consider […] Click to continue reading this post →

God’s Final Message?

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“According to So Long, and Thanks For All the Fish, God’s Final Message To His Creation is written in fire in letters thirty feet high on the far side of the Quentulus Quazgar Mountains in the land of Sevorbeupstry on the planet of Preliumtarn, which orbits the star Zarss, which is located in the Grey Binding Fiefdoms of Saxaquine. The long path to the message is lined with souvenir stands at spaced-out intervals.

When Marvin reads the message, it says, “We apologise for the inconvenience.” However, Fenchurch’s reaction suggests that the message she saw was the Ultimate Question of Life, the Universe, and Everything (and that presumably, therefore, the Message is personalized to each viewer).”

–Douglas Adams.

Or perhaps this* is God’s Final Message: […] Click to continue reading this post →

Tales From The Industry, VIII

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“Hi.”
“Hi.”
“So are you the Talent?”
“Uh… Yes… Maybe.”
“You’re the Physicist?”
“Yes.”
“You’re a real Physicist? Not just playing one?”
“I’m… real.”

Snippet of conversation between myself and a woman from the art department at the studio, while we stood waiting for our green tea to brew. The floor is full of tables all around, mostly occupied with various people sitting at them fiddling with Macs. (Macs everywhere, as I’ve come to expect from the people in the Industry.) There’s a serious-looking table with more senior looking people discussing something in earnest, and another serious-looking table with people editing video on more Macs. All the tables are serious, of course, but overall there is a fun atmosphere. There’s also a big situation board that is consulted regularly by groups of people. It is covered in bright yellow stick-notes covered in writing that are being moved around. There are people coming in and out with a sense of purpose, and some of the crew I am with are milling around with bits of equipment. All very exciting-looking. It is all made a bit comical by this totally out of place and thoroughly splendid trio of bright red chandeliers that are hanging down from the ceiling over what looks like the head table for the senior folk. Strange but well-appreciated quirk of decoration, for what is otherwise a high-ceilinged warehouse-type space.

The situation? Shooting some fun things about physics for a TV show. It will air on a station near you (in the USA) next year some time. Details then. We converted a corner of one of our teaching labs at USC into a mini-studio: […] Click to continue reading this post →

String Theory Goes A Little Bit Country?

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n these hard times for basic science research, scientists look elsewhere for supplementary financial support. It seems that the monolithic entity simply known as “String Theory” is trying to diversify its funding sources even more creatively than before! Some recently spotted* evidence in the Nashua Telegraph in New Hampshire:: […] Click to continue reading this post →

Government Gets Stern

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Well, as you can tell by looking in the “environment” category here, I’m likely to be pleased to hear about the Stern report, released yesterday (Guardian article and links to report here) and also pleased to hear that the UK government is taking the report seriously…. more or less.

I’d have a lot more to say, but I’ve said so much about this already, and I’m not really up to a long post on this right now. But I could not let this excellent (and hopefully landmark) event go unmarked. The point, as has been said before:- Nobody is going to get going on this because it is “the right thing to do”, since it is difficult for individuals and businesses to act in a way that makes things less than convenient for yourself for a cause that seems so abstract. Pure market forces will not do it either. We need actual leadership from the scientists -which has more or less happened for a while now- and action and structure put in place by the people who will really get things going: economists and then governments (because they follow the money).

Well, Stern is a major figure in the “economists” group, and so this is good news. I must admit though that it really did make me cringe every time I heard the announcers on BBC Radio 4, while trying to emphasise how significant the report’s findings were, saying things like […] Click to continue reading this post →

A Promising Sign?

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Hopeful sign of the future*?

[two higgs image]

There could be other store names of this sort breaking out depending upon what is found at the LHC and the ILC. You could have the “Superpartners” dating agency, for one, and perhaps “Dark Matter” chocolate bars (made by same company that brought you “Milky Way”, of course), as another… the possibilities are endless. […] Click to continue reading this post →