For an astronomer or a mathematician “excursion set” is a term of art – they are one of the technical tools we use to make sense of the filamentary cosmic web traced out by the clusters of galaxies that form in the evolving universe.
This blog is likewise a “set of excursions” – reflections on cosmology, astrophysics, particle physics, and perspectives of a scientist looking at the wider world. It is eclectic and low-traffic; rarely more than once a month and often just a few times a year.
Internet platforms come and go so it seems best to cut my own path rather than host my blog inside a specific online ecosystem. However, the “like, share and subscribe” mantra of internet creators transcends any single site, so please sign up to the newsletter and/or follow me on BlueSky or LinkedIn to get notifications for new articles.
Lastly, pieces here are available for syndication and republication, and posts from here have been republished at
Get in touch with me to ask for permission.
