This week saw the 5th international conference on the history of physics at the University of Coimbra, Portugal. The event, supported by the Institute of Physics, the European Physical Society and Portuguese Society of Physics, was the fifth in an ongoing series of international conferences on the history of physics, a biennial series of meetings that aims to bring together professional historians and physicists with an interest in the history of their subject. This year’s conference was a great success, thanks to the indefatigable work of the organising committee chaired by Professor Isabel Malaquias of the University of Aveiro. You can find details of the organisation of the conference here

As 2025 marks the centenary of an important year in the development in quantum mechanics – and has been declared International Year of Quantum Science and Technology by the United Nations – the theme of the conference was ‘Physics of the early decades of the 20th century’.
Thus there were several great talks on quantum theory, such as ‘From the old quantum theory to the new quantum mechanics and and chemical bonding’ by Michael Jewess and ‘Schrodinger’s route to Schrodinger’s equation ‘ by Ricardo Jose Lopes Coelho. However there were many other interesting talks on a diverse range of topics, from ‘Antimatter; its early history’ by noted historian Helge Kragh to ‘Electrotherapeutics: the new physics of radiation applied in the early 20th century clinic‘ by Chris Sinclair.. You can find the conference programme here and the book of abstracts here.
For my own case, I gave a talk on relativity and cosmology, noting that 2025 marks the centenary of Lemaitre’s intriguing paper Note on the de Sitter Universe, an important landmark on the route to the discovery of the expanding universe. In this work, Lemaitre’s first published paper on cosmology, the young cleric showed unequivocally that the de Sitter model is an expanding universe, settling a long debate between the giants of cosmology and laying the ground work for Lemaitre’s famous expanding model of 1927. You can find the slides I used in the My Seminars section of this blog.

Yours truly in action
Overall, it was a most enjoyable conference, finishing with a fascinating tour of the university. Coimbra is one of the oldest universities in the world and I thoroughly enjoyed our tour of the ancient faculties and the impressive science museum. My favourite part of the campus was a prison below the main library, preserved to this day, where students were kept if they misbehaved!

A fascinating talk on Film and Fluid Dynamics by Sarine Waltenspul and Mario Schulze

A superb talk on the history and context of the Solvay Conferences by Alessio Rocci and Franklin Lambert






