I created this report after wrapping up our large high performance computing project about strong early universe phase transitions. It doesn't seem to be available anywhere publicly, so I am putting it online here.

I used Tweetback to create an archive of all my Twitter posts, which you can find here. I mostly use Mastodon nowadays, where I am @davidjamesweir@tech.lgbt.

I was keen to help a colleague accelerate their numerical integrations, while keeping the project as high-level and pythonic as possible. This article (and the associated GitLab repository) is the result of my constructing a minimal working example to do numerical integration in SciPy with the integrand specified in a compiled Cython function.

I wrote an article for Arkhimedes on the new Kumpula Campus Code of Conduct. Here is a copy of the article as submitted. Corrections and alterations made after submission are not reflected here.

I very slightly adapted this project by Shea Garrison-Kimmel to make maps showing travel times by public transport to the physics departments in Helsinki and Nottingham. Any errors are my own.

I gave a blackboard talk at UKCosmo in May 2019. As I usually like to present movies and other visualisations when giving talks, I have collected that material (and key references and acknowledgments) here instead. The scanned notes for the talk are now available, and the final movies from the …

With most of my collaborators, we use git for version control of draft papers, written in latex. I usually bundle a makefile in the git repo to check for unresolved references and rerun [pdf]latex if necessary. In this post I will discuss how to use low-level git commands to embed useful information into the generated PDF.

I gave a poster on cosmic necklaces at COSMO-15 in Warsaw, as well as the subsequent DiRAC Science Day. This page has links to the original posters and other information.

Recently, I published the paper Revisiting the envelope approximation: gravitational waves from bubble collisions. This work compares two methods for computing the gravitational wave power spectrum from colliding bubbles from a phase transition in the early universe. It turned out to be an ideal example of a physics simulation in which the MapReduce algorithm can be applied.

There is limited information out there about how to do visualisations with VisIt and ghost zones, so I decided I had to put it out myself.

I gave a poster at the conference Beyond Lambda CDM in January 2015. This page has links to the original poster and other information.