Originally from the Kansas City area, John Baker studied physics at the Truman State University before obtaining a PhD in gravitational physics at the Pennsylvania State University. His doctoral research focused on the predictions of Einstein’s general relativity, particularly in relation to black hole mergers. Following a postdoctoral fellowship at the Albert Einstein Institute in Potsdam, where he developed numerical simulations to model these extreme phenomena, he joined NASA’s Goddard Space Flight Center in 2001. There, he continued his research in gravitational astrophysics, focusing on the modelling and interpretation of gravitational wave signals, which lie at the heart of the scientific challenges of the LISA mission.
A new way to observe the Universe
Unlike current observatories, LISA will be able to detect signals from major cosmic events, such as the merger of massive black holes at the far reaches of the Universe, as well as from closer stellar systems within our own galaxy. France, through CNES, plays a central role in analysing the data produced by the mission, particularly in identifying and characterising these various sources.
Anticipating unexpected discoveries
But for John Baker, the real challenge begins where current models end. While LISA already promises major advances, it could also reveal completely unexpected phenomena. How can we distinguish a previously unobserved astrophysical signal from an instrumental artefact? How should we interpret observations that do not fit any known scenario?
His work aims to anticipate these situations by exploring several leads: new types of gravitational wave sources, physical processes that have yet to be fully studied, and the cross-referencing of LISA data with other astronomical observations. This approach will enable the development of analytical methods capable of detecting and validating unexpected discoveries, whilst ensuring their scientific robustness.
Beyond theoretical advances, this project is fully aligned with a culture of open and collaborative science. The analysis of LISA data will involve a broad international community and will require new tools and skills. By training young scientists in these areas, John Baker is also helping to prepare the next generation of researchers, capable of making full use of this data, whether in research or in other innovative sectors.
By supporting this kind of initiative, France is reaffirming its commitment to major international scientific exploration. With LISA, and thanks to researchers such as John Baker, it is positioning itself at the forefront of a rapidly evolving discipline, poised to reveal the deepest secrets of the Universe.
