A Dialogue about Art and Science!

On Saturday (tomorrow), I’ll be talking with science writer Philip Ball at the Malvern Festival of Ideas! The topic will be Science and Art, and I think it will be an interesting and fun exchange. It is free, online, and starts at 5:15 pm UK time. You can click here for the details.

I’ll talk a little bit about how I came to create the non-fiction science book The Dialogues, using graphic narrative art to help frame and drive the ideas forward, and how I really wanted to re-shape what is the norm for a popular science book, where somehow using just prose to talk about serious scientific ideas has become regarded as the pinnacle of achievement – this runs counter to so many things, not the least being the fact that scientists themselves don’t just use prose to communicate with each other!

But anyway, that’s just the beginning of it all. Philip and I will talk about […] Click to continue reading this post

Full Circle

snapshot of paper

Yesterday I submitted (with collaborators Felipe Rosso and Andrew Svesko) a new paper to the arXiv that I’m very excited about! It came from one of those lovely moments when a warm flash of realisation splashed through my mind, and several fragments of (seemingly separate things) that had been floating around in my head for some time suddenly all fit together. The fit was so tight and compelling that I had a feeling of certainty that it just “had to be right”. It is a great feeling, when that happens. Of course, the details had to be worked out, and everything checked and properly developed, new tools made and some very nice computations done to unpack the consequences of the idea… and that’s what resulted in this paper! It is a very natural companion to the cluster of papers I wrote last year, particularly the ones in May and June.

What’s the story? It’s all about Jackiw-Teitelboim (JT) gravity, a kind of 2D gravity theory that shows up rather generically as controlling the low temperature physics of a wide class of black holes, including 4D ones in our universe. Understanding the quantum gravity of JT is a very nice step in understanding quantum properties of black holes. This is exciting stuff!

Ok, now I’ll get a bit more technical. Some background on all this (JT gravity, matrix models, etc), can be found in an earlier pair of posts. You might recall that in May last year I put out a paper where I showed how to define, fully non-perturbatively, a class of Jackiw-Teitelbiom (JT) supergravity theories that had been defined in 2019 in a massive paper by Stanford and Witten (SW). In effect, I showed how to build them as a particular combination of an infinite number of special “minimal string” models called type 0A strings. Those in turn are made using a special class of random matrix model based on […] Click to continue reading this post


Revisiting an old friend you might recognize. (And discovering that my old inking/shading workflow was just fine. – I’d been experimenting with other approaches and also just getting back into the saddle, as it were. I’ve found that I’d already landed on this approach for good time-cost/benefit reasons.) -cvj


[caption id="attachment_19762" align="aligncenter" width="499"]Jupiter and Saturn 21st December 2020 Jupiter (with some moons) and Saturn, 21st December 2020 (click for larger view) [/caption]

But… while the viewing on the 21st (the peak of the conjunction) was perfect, seeing three of the Galilean moons, and the glorious rings of Saturn, very clearly, getting a decent through-the-lens photo was not so trouble-free. I was dissatisfied with the roughs of the photos I got that night, with lots of blurring and aberrations that I felt I should have been able to overcome. So I spent the next day taking the telescope entirely apart, checking everything, and trying to colimate it properly, and testing schemes for better vibration stabilisation of the camera. I was ready for another session of photographing the next night, but it was cloudy, with only about […] Click to continue reading this post

Winds of Change!

[caption id="attachment_19735" align="aligncenter" width="499"]Montage of broken telescope parts Broken Telescope![/caption]There’s an exciting astronomical conjunction tonight! Jupiter and Saturn (that you may have noticed have been approaching each other in the sky steadily over the course of the year) will be at their closest approach! It has already been a lovely sight in the evening sky over the last many days. Since I’d been doing a bit of observation and photography of each planet in July (click on the two below for some blurry (but exciting to me) offerings…see more photos I shared on social media – I don’t think I posted them directly here), I’ve been wondering what sort of views I might be able to […] Click to continue reading this post

This Feels Great!

[caption id="attachment_19729" align="aligncenter" width="499"]Andrea Ghez accepting the 2020 nobel prize for physics Andrea Ghez accepting the 2020 Nobel Prize for Physics[/caption]You know, it is easy (and healthy) to be steadfastly cynical about the whole prize thing, but sometimes it is just great to simply cast that aside and get into the spirit of it. This is one such time. The Nobel Prize ceremony was today and you can watch the whole thing on YouTube here. (Physics starts at about 36 minutes in.) My interest was in the moments Andrea Ghez and Roger Penrose picked up (literally this year) their prizes for their wonderful work on black boles. The picture I was able to screen grab of Andrea in particular says it all.

I’ve met Andrea Ghez on an number of occasions (and communicated electronically on many more), usually because of our joint interest in making science accessible to the public through talks (where we first met during K C Cole’s excellent Categorically Not! series), TV shows (where we’ve sometimes connected behind the scenes, in the context of shows or films we’re both in, or thinking of being in), and so forth. All our interactions have been […] Click to continue reading this post

The Notebooks

[caption id="attachment_19724" align="aligncenter" width="499"]A montage of notebooks A montage of some of my notebooks. Click to zoom in![/caption]

This is a quick montage of a selection of my notebooks over the last few years. As you may know, I often carry a little (usually black) notebook with me whenever out and about in the world (in normal circumstances at least). It is useful for jotting down or working through ideas, doing computations of research ideas, writing to-do lists, and -very importantly- it is an especially good means of reminding me to grab a moment to do a sketch. As a result, they’ve become a record of what I’ve been thinking about in certain periods, what I might have seen on the way to work (back when I was sketching faces on the subway), and also an interesting combination of marks on paper that I actually simply like just looking at.

On Thursday I’ll be taking part in a big event at the Getty […] Click to continue reading this post

Wider and Warmer

[caption id="attachment_19717" align="aligncenter" width="499"]Los Angeles Panorama Los Angeles. Click for an expanded view.[/caption]

The last post had a nice picture of the city that I enjoyed sharing with you. However, on Sunday I ran to the top of one of the highest points of the park and happened to take a much nicer photograph, showing more of the surrounds, and with warmer light. I’m sharing this one with you for sure. If you click on the image you’ll get a more detailed view. This was at about 4:15pm, in case you’re wondering.


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