For a third slogan I’ve chosen: Nature is fundamentally conformally invariant. Note the weasel-word “fundamentally”. We know that nature is not conformally invariant, but the kind of thing I have in mind is pure QCD, where the underlying classical theory … Continue reading ?
For a second slogan about quantum mechanics I’ve chosen: Quantum mechanics is evidence of a grand unification of mathematics and physics I’m not sure whether this slogan is likely to annoy physicists or mathematicians more, but in any case Edward … Continue reading ?
Ecologist John Harte applies principles from his former life as a physicist to his work trying to save the planet. Each summer for the past 25 years, ecologist John Harte has spent his mornings in a meadow on the western slope of the Rocky Mountains. Show More Summary
In September, DES will make data collected in its first season freely available to researchers. On August 15, with its successful first season behind it, the Dark Energy Survey collaboration began its second year of mapping the southern sky in unprecedented detail. Show More Summary
I already congratulated Subhash Khot in my last post for winning the Nevanlinna Award, but this really deserves a separate post. Khot won theoretical computer science’s highest award largely for introducing and exploring the Unique Games Conjecture (UGC), which says (in one sentence) that a large number of the approximation problems that no one has been able to prove […]
For a first slogan (see here for slogan zero) I’ve chosen: Quantum theory is representation theory. One aspect of what I’m referring to is explained in detail in chapter 14 of these notes. Whenever you have a classical phase space … Continue reading ?
Small observations of things that have struck me as weird during our UK stay to this point: – There is no alarm clock in our hotel room. – There are no drinking fountains in public spaces. – The travel-on-the-left thing would be easier if it were consistently applied. About one stairway in three asks people…
I promised two things in a previous post. One was the incomplete sketch I did of Crater lake and West Maroon Valley (not far from Aspen) that I started before the downpour began, last weekend. It is on the left (click to enlarge.) The...Show More Summary
Students working on their PhDs at the Large Hadron Collider explain their research with snacks, board games and Legos. Concepts in particle physics can be hard to visualize. But a series of videos on the US LHC YouTube channel endeavors...Show More Summary
I recently finally found a copy of Jon Butterworth’s Smashing Physics, which came out in the UK a few months ago, but still hasn’t made it to the US. As far as I know it’s the first book about the … Continue reading ?
Kate and I had a very nice time doing touristy things in Bath yesterday during the day– old church, very old hot spring, Georgian architecture– then went on to Bristol where I gave a talk on the forthcoming book, as you can see in the picture above. I would ordinarily include a SlideShare link to…
A couple days ago, a reader wrote to me to ask whether it’s possible that the solution to the P vs. NP problem is simply undefined—and that one should enlarge the space of possible answers using non-classical logics (the reader mentioned something called Catu?ko?i logic). Since other people have emailed me with similar questions in […]
In case you missed it, Maryam Mirzakhani has been awarded the Fields Medal! This is regarded as the most prestigious prize in mathematics. Here's a Guardian article covering it at a general level, and here is the page on all the award winners, with more detail on each, at the International Mathematical Union website. Show More Summary
I figured I probably ought to post something to let the wider world know we made it safely to London, and have been engaging in tourism. So, please take the above photo of St. Paul’s with a backdrop of the ominous dark clouds that have been chasing us around the city as proof of our…
I thought this wasn’t supposed to be announced until late this evening New York time, but the Fields Medal announcement is now online. The winners are: Artur Avial Manjul Bhargava Martin Hairer Maryam Mirzakhani Mirzakhani is the first woman to … Continue reading ?
In July 140 truckloads of concrete arrived at Michigan State University to begin construction of the Facility for Rare Isotope Beams. Michigan State University’s campus will soon feature a powerful accelerator capable of producing particles...Show More Summary
This year's discoveries follow the well-known Kübler-Ross pattern: 1) announcement, 2) excitement, 3) debunking, 4) depression, 5) acceptance. While BICEP is approaching the end of the cycle, the sterile neutrino dark matter signal reported earlier this year is now entering stage 3. Show More Summary
I went for a little hike on Sunday. Usually when I'm here visiting at the Aspen Center for Physics I go on several hikes, but this year it looks like I will only do one, and a moderate one at that. I had a bit of a foot injury several weeks ago, so don't want to put too much stress on it for a while. Show More Summary
For a zeroth slogan about quantum mechanics, I’ve chosen What’s hard to understand is classical mechanics, not quantum mechanics. The slogan is labeled by zero because it’s preliminary to what I’ve been writing about here. It explains why I don’t … Continue reading ?
This year I’ll be teaching a new version of the same course on quantum mechanics aimed at mathematicians that I taught during the 2012-3 academic year (there’s a web-page here). During the last course I started writing up notes, and … Continue reading ?