Today’s Nobel Prize in physics has an interesting wrinkle to it. I summarised it in the extract above from a certain forthcoming book*. Click for a larger view. Congratulations to the winners Rainer Weiss, Barry C Barish and Kip S Thorne! There are some excellent descriptions (either for layperson level … Click to continue reading this post
Dear colleagues far and wide. I’m delighted to share the news that we are having a job search in Astrophysics! Please note the link’s contents, and share it to those who might be interested. Thanks! https://usccareers.usc.edu/job/los-angeles/assistant-professor-of-physics-and-astronomy/1209/5668638 -cvj
I just got off the phone with an LA Times reporter about this new result (announced today in PRL and by LIGO directly), trying to get across some of the enthusiasm about this shared by a wide community of physicists and astronomers, and the reasons why. Here’s a nice New York Times article about the discovery, by Dennis Overbye. The graphic to the right is from the LIGO press release.
(Incidentally, according to Physics Today it is Kip Thorne’s birthday today. What an excellent birthday present for him!)
-cvj Click to continue reading this post
I’ve a train to catch and so I did not have time to think of a better title. Sorry. Anyway, for those of you who follow the more technical side of what I do, above is a screen shot to the abstract of a paper to appear tomorrow/today on the arXiv. I’ll try to find some time to say more about it, but I can’t promise anything since I’ve got to finish writing another paper today (on the train ride), and then turn myself away from all this for a little while to work on some other things. The abstract should be […] Click to continue reading this post
I put a set of new results out on to the arxiv recently. They were fun to work out. They represent some of my continued fascination with holographic heat engines, those things I came up with back in 2014 that I think I’ve written about here before (here and here). For various reasons (that I’ve explained in various papers) I like to think of them as an answer waiting for the right question, and I’ve been refining my understanding of them in various projects, trying to get clues to what the question or questions might be.
As I’ve said elsewhere, I seem to have got into the habit of using 21st Century techniques to tackle problems of a 19th Century flavour! The title of the paper is “Approaching the Carnot limit at finite power: An exact solution”. As you may know, the Carnot engine, whose efficiency is the best a heat engine can do (for specified temperatures of exchange with the hot and cold reservoirs), is itself not a useful practical engine. It is a perfectly reversible engine and as such takes infinite time to run a cycle. A zero power engine is not much practical use. So you might wonder how close a real engine can come to the Carnot efficiency… the answer should be that it can come arbitrarily close, but most engines don’t, and so people who care about this sort of thing spend a lot of time thinking about how to design special engines that can come close. And there are various arguments you can make for how to do it in various special systems and so forth. It’s all very interesting and there’s been some important work done.
What I realized recently is that my old friends the holographic heat engines are a very good tool for tackling this problem. Part of the reason is that the underlying working substance that I’ve been using is a black hole (or, if you prefer, is defined by a black hole), and such things are often captured as exact […] Click to continue reading this post
They recorded one of the panels I was on at SXSW as a 30 minute episode of the BBC World Service programme CrowdScience! The subject was science and the movies, and it was a lot of fun, with some illuminating exchanges, I had some fantastic co-panellists: Dr. Mae Jemison (the astronaut, doctor, and chemical engineer), Professor Polina Anikeeva (she researches in materials science and engineering at MIT), and Rick Loverd (director of the Science and Entertainment Exchange), and we had an excellent host, Marnie Chesterton. It has aired now, but in case you missed it, here is a link to the site where you can listen to our discussion.
-cvj Click to continue reading this post
A little while back, toward the end of December last year, I did a long stretch of days where I needed to change my routine a bit to take advantage of a window of time that came up that I could use for pushing forward on the book. I was falling behind and desperately needed to improve my daily production rate of finished art in order to catch up. So, I ended up ditching making a sandwich in the morning, instead leaving very soon after getting up to head to my office. I then stopped taking my sandwich altogether when I ran out of bread and did not make the time in the evening to bake a fresh batch, as I do once a week or so, because I was just coming back home and falling into bed.
The USC catering outlets were all closed that week. This meant that I ended up seeking out a place to buy a sandwich near my office. I found a place […] Click to continue reading this post
(Well, not really oops… It’s deliberate.) LIGO has announced another gravitational wave detection from a black hole merger! This time the black holes were 14.2 and 7.5 times the mass of the sun, and merged to form a new black hole of mass 20.8 times the mass of our sun, releasing a burst of energy […] Click to continue reading this post
This is an amazing day for humanity! Notice I said humanity, not science, not physics – humanity. The LIGO experiment has announced the discovery of a direct detection of gravitational waves (actual ripples in spacetime itself!!), opening a whole new window with which to see and understand the universe. This is equivalent to Galileo first pointing a telescope at the sky and beginning to see things like the moons of Jupiter and the phases of venus for the first time. Look how much we learned following from that… so we’ve a lot to look forward to. It is 100 years ago since gravitational waves were predicted, and we’ve now seen them directly for the first time!
Actually, more has been discovered in this announcement:- The signal came from the merger of two large (stellar) black holes, and so this is also the first direct confirmation of such black holes’ existence! (We’ve known about them […] Click to continue reading this post
Ok, I promised to explain the staircase I put up on Monday. I noticed something rather nice recently, and reported it (actually, two things) in a recent paper, here. It concerns those things I called “Holographic Heat Engines” which I introduced in a paper two years ago, and which I described in some detail in a previous post. You can go to that post in order to learn the details – there’s no point repeating it all again – but in short the context is an extension of gravitational thermodynamics where the cosmological constant is dynamical, therefore supplying a meaning to the pressure and the volume variables (p,V) that are normally missing in black hole thermodynamics… Once you have those, it seems obvious that you can start considering processes that do mechanical work (from the pdV term in the first law) and within a short while the idea of heat engines in which the black hole is the working substance comes along. Positive pressure corresponds to negative cosmological constant and so the term “holographic heat engines” is explained. (At least to those who know about holographic dualities.)
So you have a (p,V) plane, some heat flows, and an equation of state determined by the species of (asymptotically AdS) black hole you are working with. It’s like discovering a whole new family of fluids for which I know the equation of state (often exactly) and now I get to work out the properties of the heat engines I can define with them. That’s what this is.
Now, I suspect that this whole business is an answer waiting for a question. I can’t tell you what the question is. One place to look might be in the space of field theories that have such black holes as their holographic dual, but I’m the first to admit that […] Click to continue reading this post
Since the early Summer I’ve been working (with the help of several people at USC*) toward a big event next Friday: A celebration of 100 years since Einstein formulated the field equations of General Relativity, a theory which is one of the top one or few (depending upon who you argue with over beers about this) scientific achievements in the history of human thought. The event is a collaboration between the USC Harman Academy of Polymathic Study and the LAIH, which I co-direct. I chose the title of this post since (putting aside the obvious desire to resonate with a certain great work of literature) this remarkable scientific framework has proven to be a remarkably robust and accurate model of how our universe’s gravity actually works in every area it has been tested with experiment and observation**. Despite being all about bizarre things like warped spacetime, slowing down time, and so forth, which most people think is to do only with science fiction. (And yes, you probably test it every day through your […] Click to continue reading this post
Yeah. Not sure how to best title this post or fully explain the picture [edit: Picture taken down temporarily until the show is ready to be promoted]. Let’s just say that I spent a bit of this afternoon explaining some of the science of the Large Hadron Collider to a bright orange puppet that was determined to not believe whatever I told him/it. It was fun, and was done to camera at Los Angeles Center Studios downtown. (I was actually speaking about things that intersect with the subject of yesterday’s post, if you’re interested.) It is for a new show on a channel that I can’t mention yet*, and I’ll let you know as soon as I know what the air date is, etc.
Well, one more thing, in support of the old “It’s a small world after all” saying. I noticed from the call sheet that this morning they were shooting a fun segment that was hosted by my friend Hal Rudnick the host of Screen Junkies! (Have a look at some of the science-meets-movies things we’ve done together here, here and here.) Also, a friend I’d not seen in […] Click to continue reading this post
Worth a read: This is ‘t Hooft’s summary (link is a pdf) of a very interesting idea/suggestion about scale invariance and its possible role in finding an answer to a number of puzzles in physics. (It is quite short, but think I’ll need to read it several times and mull over it a lot.) It won the top Gravity Research foundation essay prize this year, and there were several other interesting essays in the final list too. See here.
-cvj Click to continue reading this post
Since people were asking for copies of my slides from my colloquium chalkboard-style talk on black holes and the things I call “holographic heat engines” last month at Harvey Mudd College, I decided to export them as a movie. You can find it on YouTube. Link below. It was a 50 minute talk, but all the builds are compressed down to a 6 minute file! I try to keep the bulk of the narrative in my head and speak it with the slides as visual aids (instead of writing everything on the slides as is often the practice) and so I do not know […] Click to continue reading this post
As promised on Tuesday, below you will find my Screen Junkies interview where I chat with Hal Rudnick about some of the science in Interstellar. We covered a lot of topics and went into a lot of detail, but a lot of that is on the cutting room floor in order to make a svelte (but relatively generous) ten minute cut. I hope you enjoy it. (See my earlier thoughts on why I think scientists need […] Click to continue reading this post