Andrew R. Liddle (born 9 June 1965) is a professor of astrophysics at the University of Lisbon. From 2018 to 2020 he was a Visiting Fellow at the University of Waterloo. From 2013 to 2017 he was Professor of astrophysics at the Royal Observatory Edinburgh. Publications include books and over 260 papers. He is a theoretical cosmologist and is interested in understanding the properties of the Universe and how these relate to fundamental physical laws.
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