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My main areas of research has been on the late stages of stellar structure and evolution, in particular Asymptotic Giant Branch stars, and stellar oscillations, both linear analysis and nonlinear simulation. I have also dabbled a bit in observational cosmology.
The generation and evolution of cosmological perturbations that lead to large-scale structure, to gravitational waves and to magnetic fields in the Universe. Dark energy and modified gravity models for the late-time acceleration of the Universe and their observable predictions. Using observations, including radio telescopes like MeerKAT and SKA, to test models of the Universe.
I am currently a Professor in astrophysics at the The University of Oxford. I am heavily involved in developing the science case for the next generation of radio telescopes such as the Low Frequency Array (LOFAR) and the Square Kilometer Array. I also lead one of the six public surveys to be conducted on the new VISTA near-infrared telescope.