Well, I’ve been quiet here because I got rather swamped with lots of things over the last few days. The biggest thing was yesterday. I gave a colloquium at Caltech entitled “Cooking with Quarks and Gluons: Recipes from the String Theory Kitchen”*. The abstract is given below**. It is mostly based on what I wrote about last Summer.
With all the other things I had to do (including writing and giving two fun two hour lectures on cosmology in my undergraduate GR class) I still decided that it was time to totally rethink how I tell this exciting physics story, and how I present it. This meant designing and building many new slides. Each slide can take a long time to prepare, so this took two solid days of hiding away while designing and building them, only breaking for the other stuff.
Well, it was fun in the end, and today I am exhausted. I decided that you should not miss out entirely on the treats, so I made a little movie of the first parts of the talk to Continue reading ‘Some Unusual Recipes’
Well, I’ve said (and pointed to) enough on the matter, but I could not resist a quote from today’s essay by Dennis Overbye in the New York Times (do have a look at the rest of it):
Besides, the random nature of quantum physics means that there is always a minuscule, but nonzero, chance of anything occurring, including that the new collider could spit out man-eating dragons.
Excellent! Proper flying, armoured, fire-breathing, talking, treasure-hoarding, Continue reading ‘So What Are the Odds?’
Well, Comedy Central fans, here’s something for you. Before you get settled into your nightly dose of the Daily Show on Wednesday night, tune in half an hour earlier, at 10:30 (at least on the coasts). It’s Lewis Black’s new show “Root of All Evil”, this week covering the issue of which of the two prevailing juggernauts in our culture, American Idol or High School, that reduce so much in our culture to popularity contests, is more Evil.
(This one I actually think speaks to a serious point. Sadly, in an presidential election year here, any attempt to parody this sort of thing for comedic effect is totally outshone by almost any news broadcast.)
Continue reading ‘Comedy Moments’
Another giant moves on. John Wheeler died yesterday. He’s known for bringing to light many wonderful pieces of physics (he’s also credited for coining the term “black hole”), classical and quantum (helping craft many of the ideas surrounding issues in quantum gravity, for example), and for being a great teacher. There’s an obituary* by Dennis Overbye in the New York Times here. I’ve borrowed their lovely photograph (which was given no photographer credit, so I cannot).
[Update: Daniel Holz has a personal reflection here.]
-cvj
*I learned of the article from Often in Error.
Did you catch the discussion on NPR’s Science Friday just past? I was particularly pleased to hear some calm, thoughtful responses from someone who definitely knows his way around the issue, on a major broadcast. What issue? Whether or not we high energy physicists are carefully endangering planet earth (or even the whole universe) by switching on the Large Hadron Collider (LHC) later this year (or whenever it is due to start collisions). You’ll recall the lawsuit, since I posted on it here (with links to other thoughts), and perhaps you even recall my April Fool post on the matter.
Well, Ira Flatow was talking to Frank Wilczek! It was a good, informed chat around the issues that also gave Frank a chance to explain a little about what the machine was really constructed for (since this seems to so easily fall out of these public discussions of black holes and extra dimensions and strangelets (interesting as they are), and to plug his book that is due to come out. Since it’ll almost certainly be a really interesting Continue reading ‘Frank Common Sense’
I should really start a new series of posts with the title “What Could Possibly Go Wrong…?” This story from yesterday would be a fitting entry…
Did you see Cronenberg’s “Eastern Promises” last year? It was excellent, and of course totally overlooked in the recent discussions about good films of last year. It was released and seen by most people way too early in the year. Hollywood’s memory is not very good at recalling anything that came out earlier than the Fall if it did not come with a huge bang of publicity and so forth (like the excellent Bourne Ultimatum). Well, just for a moment there, I was in an American version of the film. (Setting-wise I mean. The film is set in a gritty, realistic not-Four-Weddings-or-Bridget-Jones London.) I was in New Jersey yesterday just for the day. (I’ll tell you more about it later.) Here’s what happened.
Continue reading ‘I’m Just Driver’
(The title refers to this post.)
Ok, this is a post of (probably pointless) complaint about one of society’s conventions. I do that from time to time. So as I said in an earlier post, I lost my bag within which I carry around my personal day to day stuff. It is small and fits on my shoulder and carries lots of useful stuff that I don’t like to carry in my pockets. My handbag, if you will. I happily carry such a bag, and call it by that name quite often. Sometimes I jokingly say that I’m “secure enough in my sexuality to call it what it is”, and not have to lamely resort to inventing a new name for something that already exists in the world serving that exact function - but carried by women. I’d forgotten just how serious and non-joking this whole business actually is. I did not recall how much trouble I’d previously gone to when I tried to find such a bag that suits my needs (practical and aesthetic). It’s a real pain. Losing it now meant that I had to go through this all over again, and discovering that I’d not really finished the job that previous time. (And the alternative names are so stupid - “manbag”, “murse”, etc… Haven’t they noticed that “handbag” is already gender neutral?)
What is the problem? Simply put, there’s an unbelievable amount of phobia here (and it is here in the USA more than, say Europe) about guys carrying such bags. Utterly Continue reading ‘Papa’s Got A Brand New Bag (Again)’
This was not the time to break my over a decade long run of not flying American Airlines. I pretty much only fly United when doing most travel, but I had no choice for this trip from LA to Amarillo, Texas. It was a quick hop there and back in about 36 hours to take part in a rather important event - Andrew Chamblin (a friend and colleague who, you may know, died tragically in 2006) was being inducted into the Hall of Fame of his old High School and so I went along to take part in the ceremony with his family and some of his friends, and address (briefly) the assembled student body (it was such an honour to be asked Continue reading ‘Head in the Clouds’
It was hard not to notice yellow all over Griffith Park this weekend. There were several Continue reading ‘Yellow Fields’
Takuya Okuda talking about Wilson Loops at the most recent SCSS, UCLA, Dec. 2007. Click to enlarge.
The next regional string meeting is a two-day one at Caltech, this Friday and Saturday, organized by Joseph Marsano. It’s going to be full of interesting talks and conversations, as usual. Please encourage your graduate students to come, especially, since special effort is made to make sure that each talk begins with a pedagogical portion to help non-experts in that subfield navigate and see the motivation.
The speakers are:
Continue reading ‘Southern California Strings Seminar’
Did you see the Nike commercial with Kobe Bryant as Einstein?
It is part of a series with the theme “genius” in which he plays a variety of historical figures with a reputation for innovation. More (including the video) on Bryant’s website, and there’s a breakdown by fliptomato on his blog (where I found this).
Given the opening line of fliptomato’s blog post, I wonder if he (or the commercial makers) knows about the excellent Gary Larson cartoon from very many years back Continue reading ‘Kobe as Einstein’
Ooooh! A Puzzle. Ok, maybe not the most challenging one, but hey, I’m getting old, so I’m setting the bar low:
(I’d originally intended to make some, but that’s a project for another time.) These ones will do for now. Assembly should be fun. Wait, there’s something missing:
Continue reading ‘High Table’
Tomorrow I’m shooting all day for a TV show that is going to focus on the idea of alternative universes (or parallel universes, if you prefer). Should be fun. The setting at least will be interesting (more on that later) and it ought to be interesting to see how the writer puts all the material together into a coherent narrative. Part of my job will be to try to emphasize that while parallel/alternative universes show up a lot in actual scientific discussions (and have done for a long time), we have not yet had anything like a good observational or experimental reason to believe in their existence anywhere other than in our imaginations. It’s vital to get this across (I hope they don’t just edit it out) because people are so willing to believe in many half-baked fanciful ideas - and this is one of them - and when they show up in a science documentary (this is (again) for the History Channel’s “The Universe” series, which has been very good) with actual scientists being quoted, one should be especially careful (as we were on the “Cosmic Holes” episode (with different filmmakers), which has proven to be rather popular, and is full of speculative ideas like travel using wormholes and time machines right alongside equally fantastic-sounding things, like black holes, which are in fact a scientific reality). The rest of my job will be to talk about some of the places where the idea shows up in modern thought, some of the reasons why, and some of the opportunities for solving various challenging problems (and maybe creating a host of others!!) can be afforded by such ideas.
All that aside, this reminds me of something else entirely - Do you ever have those days when you feel like you’ve accidentally stepped sideways into an alternative universe? I do. Recently, I had a huge dose of it. Sit back and I’ll tell you the story…
Continue reading ‘Consider the Alternatives’
Spring is in full flow here, and there were lovely contrasts to see on my hike in Griffith Continue reading ‘Renewal’
The previous post was a farewell to black holes in the class, not here on the blog. (And it was not quite a farewell there either, since the midterm yesterday was all about the properties of the Reissner-Nordström black hole, representing a black hole with an electric charge, and a nice computation involving cosmic censorship.)
There have been two rather notable discoveries in the black hole astrophysics world this week. The first is the discovery of what seems to be another case of an intermediate mass black hole (there was only one example known before). Not the supermassive ones that live at the centers of galaxies (tens to hundreds of millions of times the mass of our sun), and not stellar mass ones of a few times the mass of our Continue reading ‘All Creatures Great and Small’
Yesterday here at USC was my last lecture in the class about black holes (see also here). We’ve got to move on to other topics (Cosmology, Einstein’s equations, etc) and so cannot do any more. It was a fun last lecture though. I pulled together a few scraps of things I did not finish in the previous lecture (such as the extraordinarily high percentage of binding energy per unit rest mass you can extract with rotating black hole orbits - just what you need to power things like quasars) and then finished with:
-
A taste of Hawking radiation, the Bekenstein-Hawking entropy and the wonderful and beautiful subject of black hole thermodynamics that opens up when you combine gravity with quantum mechanics*, followed by…
- A quick discussion of the Penrose process for extracting energy from rotating black holes. (I’m sure that all (past, present or future) super-advanced civilizations must be using them as the ultimate emissions-free means of generating energy for heating their homes and so forth. No, really.)
*Of course, all undergraduates commonly hate it when you dare bring in stuff from other classes, so to Continue reading ‘A Farewell to Black Holes’
[Update:- NB: This was an April Fool joke. -cvj]
Some breaking news for a change. I’ve only heard snippets of this and so I’ll update later with more as I get it. That silliness that was in the news about two physicists pursuing a lawsuit against the Large Hadron Collider has suddenly become serious. (Image right: the CMS detector at the LHC, taken by Valerio Mezzanotti - from a NYT article about the LHC last year.)
Recall that the issue was that there would be the possibility of the experiment creating mini black holes that could gobble up the earth and that the CERN scientists have not done enough to demonstrate that this was not a safety issue. Of course, and has already been said in several places (see e.g., Phil’s general level post about the physics and the case here), this is utterly ill-conceived and in any case certainly not the way to go about things, but it seems that the legal route can be quite damaging for science, in the right hands.
What seems to have happened is this. Since the suit was filed in Hawaii, it falls under US Federal jurisdiction, and has been taken up as an emergency issue before the Supreme Court. Somehow the litigants got a hearing on this with the help of powerful friends who have what can only be thought of as another example of the anti-science agenda we’ve a lot of in various branches of the government in recent years.
The upshot is that the Supreme Court has announced today that they are requiring all Continue reading ‘More Trouble for LHC?’
[Update:- NB: This was an April Fool joke. -cvj]
Well, I learned recently* that the BBC wildlife program makers have done it again, breaking new ground in scientific discovery while making a new series. Quite amazing this time. From the Daily Telegraph website:
The BBC will today screen remarkable footage of penguins flying as part of its new natural history series, Miracles of Evolution.
Also:
The programme is being presented by ex-Monty Python star Terry Jones, who said: “We’d been watching the penguins and filming them for days, without a hint of what was to come.
“But then the weather took a turn for the worse. It was quite amazing. Rather than getting together in a huddle to protect themselves from the cold, they did something quite unexpected, that no other penguins can do.”
Above right (click for larger view) is a screen shot that I took of the incredible footage Continue reading ‘Liberated Penguins’
A silly lawsuit vs the search for physical law, that is. What’s the story?* An attempt to stop the Large Hadron Collider (LHC) in Geneva from operating over fears that the experiment will destroy the earth by creating a black hole that will swallow it up. Or some other bogeyman. Article by Dennis Overbye here, or here, and there’s a Fox News story by Paul Wagenseil here.
The lawsuit, filed March 21 in Federal District Court, in Honolulu, seeks a temporary restraining order prohibiting CERN from proceeding with the accelerator until it has produced a safety report and an environmental assessment. It names the federal Department of Energy, the Fermi National Accelerator Laboratory, the National Science Foundation and CERN as defendants.
Quite an entertaining read can also be found at the two plaintiffs’ website. The main Continue reading ‘Law Vs Law’
We’ve been studying rotating black holes in my class this week, which has been fun. We get to apply the techniques we’ve been honing in the context of the Schwarzschild solution (link to recent posts below) to a bit more complicated solution, the Kerr solution, which includes rotation. Some equations follow, although you needn’t be put off by them. Most of this will make sense without really understanding them much. Just so you can see the shape of the things we scribble, I’ll show you the equation that captures this curved spacetime geometry, with no real explanation (sorry):
Here 
and 
The parameter 
is the ratio of the solution’s spin or angular momentum 
to its total mass 
, measured in appropriate units. It’s a very important solution to get to grips with, since it’s not just fantasy physics, but highly relevant for astrophysics since black holes that are “out there” are unlikely to be non-rotating, and in fact, one can expect them to be rotating at quite a clip in many cases. A good many black holes - including some of the Continue reading ‘Bigger than the FCC’
In physics, most of what we do is look for the simple, often in extremely complicated systems. If you’re asking the wrong question, or looking at the wrong aspect of the system, this quest for the simple is unlikely to work at all, but the right question asked about the right aspect can yield rather striking insights, often with far-reaching consequences. Although it often is not emphasized in this manner during our school or undergraduate (and sometimes even graduate) education, this is the primary skill in the physicist’s arsenal that we teach and learn. (See an earlier article here for a take on this.)
Sometimes, you don’t need the sharp eyes and years of training and drilling in these seemingly arcane (but, I’d argue, most natural) arts (and the requisite sequestering away in monasteries and nunneries with abstinence, self-flagellation, and so forth) - there are times when if just jumps out at you that there’s a simple question or two Continue reading ‘Sand, Man’
There’s really nothing like a sweet potato roasted in the heart of a wood fire. A wood fire lit out under a clear big sky with a full moon. After a long day of hiking. A day of hiking in the desert on a super hot day of vivid blue, brown, and gold. Delicious flavours, textures and colours.
I spent most of last week on retreat in Death Valley. It was Spring break, and I was Continue reading ‘Potato, Moon’
I got an email from one of the group’s graduate students today*, pointing to an archive of videos of lectures by the great Sidney Coleman. He’s doing quantum field theory. This makes this a marvelous resource, in principle, and so I thought I’d share them with you. They are here.
I wonder: are these the lectures that Jacques Distler has mentioned attending a few times in the past on his blog? This was the 1975-1976 year, a graduate course. I wonder if anyone (else) I know was in that class room…
[Update: I learned from the discussion over on Jonathan Shock's site that there are some partial lecture notes from the course here, by Bryan Gin-ge Chen, based on notes by Brian Hill. He's looking for help on completing the project, so get in touch if you want to help out.]
I’ve never seen Coleman in action before, and so I was immediately rather curious, Continue reading ‘Lighting Up Field Theory’
Am I the only one who sees this, or does this look like the head of some giant friendly robot, all smiles with big cheeks? Remember Brad Bird’s Iron Giant, for example?
Well, it is actually not from science fiction but science fact. And it is a robot, sort of - well it can be controlled remotely to swivel its head and so forth. It is actually a Continue reading ‘Biggest Binoculars Ever’
I find this a bit sad, although most people will say “they’re only bees”. They (and lots of other beekeepers with their bees on trucks) were in the area to help with pollinating crops. I’m very enamoured of the idea that we still need bees to be brought in to perform such a crucial task for our agriculture, which makes it all the more sad to me to hear of the accident befalling the dutiful drones. Millions of bees were released on Sunday (and apparently hundreds of thousands probably killed) after a truck carrying several of their colonies overturned near Sacramento, California. You can listen to the NPR story (here) about the resulting chaos (and the emergency call-out to beekeepers in the area for help) and sting-fest that followed.
You can also read more on this in the local newspaper in the area, er… The Sacramento Bee. (No, really!)
-cvj
It’s a bit more than a month away. It’s always fun every year. It’s a Los Angeles celebration of the written word, done in wonderful sunshine, with hundreds of marvellous events in three days for young and old - Yes, it is the LA Times Festival of Books, coming up the weekend starting April 25th. The main daytime proceedings take place on the 26th and 27th (Saturday and Sunday) and I recommend them to you if you’ve not been. Mark your calendar. (Once you’re over there on Sunday, stay for the Categorically Not! event in the evening (entitled “Loops”), which will involve among others, science writer Dava Sobel!!) (Above right: One of the 2008 theme images from the Festival’s website. More here.)
The Friday evening will see the book prizes given out, kicking off the festival as usual. I remembered this just now because I found myself curious about the shortlist of books in the Science and Technology category. I wondered if there was something on Continue reading ‘Festival of Books’
Continuing a bit about the microbiology to be found in the garden, I did a post not so long ago on Correlations giving an update about the composting system I started a while ago (post on that here). You might find it interesting, and so I thought I’d let you know about it. It is here.
All’s looking well for an exciting Spring season of gardening!
-cvj
Wow, a lot of time has passed since I thought I’d get around to posting about this. You’ll recall that I went to take part in the taping of a segment for Comedy Central some time ago. Well, later on I went to the taping of the full show in which it will appear, and it was an amusing and interesting experience.
The show? Comedy Central, and in particular, Daily Show fans will be pleased to learn that Lewis Black finally has a show of his own, and it is called “The Root of All Evil”. The format is that he presides as a judge over a case examining which of two popular Continue reading ‘Tales From The Industry XIX - Black Comedy’
Black Holes, by Tamsin Van Essen. Part of a series of lovely ceramics with a physics theme. For more, visit the websites here and here.
As you may recall from the post I did some time ago, the “Light Cone” is a rather important concept in physics, and keeping track of it in a given physical scenario is an extremely important tool and technique for understanding many physical situations. (I urge you to review that post before continuing reading this one.)
One way to understand a most important concept - the event horizon - is by keeping track of lightcones, and so let’s go ahead and explore that here. The outcome is that Continue reading ‘Tipping the Light Cone: Black Holes’
Not quite as (juvenile) funny as the equivalent phrase when rings were discovered around the seventh planet, but it’ll do as a post title. I’ll tease you with the image here Continue reading ‘Rings Around Rhea’
The next Categorically Not! is on Sunday March 9th (upcoming). The Categorically Not! series of events that are held at the Santa Monica Art Studios, (with occasional exceptions). It’s a series - started and run by science writer K. C. Cole - of fun and informative conversations deliberately ignoring the traditional boundaries between art, science, humanities, and other subjects. I strongly encourage you to come to them if you’re in the area. Here is the website that describes past ones, and upcoming ones. See also the links at the end of the post for some announcements and descriptions (and even video) of previous events.
The theme this month is Puzzles! Here’s the description from K C Cole:
What isn’t a puzzle? The universe, life and everything are essentially puzzles that, to borrow from Einstein, “beckon like a liberation.” Designing buildings, choreographing dances, cooking meals and getting along with other people all involve solving puzzles (as, of course, does figuring out what’s right in front of your eyes—not to mention putting together a program such as Categorically Not!) A love of puzzles and the challenge of solving them is deeply embedded in human nature.
Gwen Roberts, Scott Kim, Gavin Scott.
Our March 9th Categorically Not! features puzzlemaster Scott Kim, who’s Continue reading ‘Categorically Not! - Puzzles!’
I don’t mean that in a bad way. It is what it is. Quite varied and wonderful, our universe is, with unexpected features I don’t think many would have guessed at not long ago (like the fact that we only understand what about 4% of it is!! Crazy, in a Continue reading ‘Still Crazy After All These Years’
Planetary Nebula NGC 2371. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
A lovely release from the Hubble Heritage project. Well worth clicking on for more detail. The image was made using Hubble. It’s a planetary nebula (NGC 2371), the Continue reading ‘Warm and Fuzzy’
Not long ago David Morrison (UCSB) came to the mathematics department here at USC to give a colloquium.
This was a treat for me for many reasons. Here are three:
- It’s always good to see Dave. He’s one of the people I’ve known in the field was since my very first postdoc when I was learning to survive in the big bad world on my own after graduate school. I mostly could not understand a word he or anyone there else said in those days (IAS Princeton, right in the belly of the Continue reading ‘Beyond Einstein: Fixing Singularities in Spacetime’
Cosmologist Stephon Alexander, with saxophone.
A snapshot from last Friday night (a week ago). There was no organized meal from the conference that night, and so people were left to their own devices to explore the chilly embrace of Washington DC. With the group of people that I was with, music emerged after dinner. Here is cosmologist Stephon Alexander (some of you may know him from his blogging days as part of the Quantum Diaries project.) with his saxophone. He’s in the middle of explaining tritone substitutions to two young Continue reading ‘A Musical Interlude’
No doubt about it: Spring has sprung. Whoever says there are no seasons in LA - and there are many who do - have no idea what they are talking about. The signs are in the air - there’s been a distinct change of the smell; lots of flowers are blooming. A parade of displays has begun. These are some of the poppies that are in various corners of the campus here at USC:
Here’s another shot….
Continue reading ‘Spring Sprung’
I had some unusual guests in my General Relativity lecture yesterday, Eric Salat and Philip Shane, two film makers from Left/Right productions. They’re working on a documentary for the History Channel on the development of various ideas in physics in the early 20th Century, and they wanted to know more about the topics, and to see a full (1 hour and 50 minute) lecture from me.
While it is the History Channel (hence the dramatic subtitle - sorry), it is not part of the series “The Universe”, by the way. It is another separate part of the increased very welcome expansion of that channel’s science programming. Have you noticed the diversification of their programming that they’ve been doing? I’ve mentioned it before, and a number of people have commented on it to me elsewhere. It has been great to see.
It’s always fun to have more people in the classroom, and so we had a lot of fun… (Or at least, I did…I hope everyone else did too.) I happened to be doing a lecture on Continue reading ‘Tales From The Industry XVIII - History Looked On’
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