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【DoA Seminar】January 19th by Baojiu Li
Description
Title: Dark Energy, Gravity and Cosmology
Speaker： Baojiu Li
Abstract:
70% of the energy budget of our Universe today is in the form of the so-called dark energy. This exotic matter species has negative pressure, causes the Hubble expansion to accelerate, and can also lead to changes to the law of gravity. Yet the nature of dark energy remains elusive a quarter of a century after its observational discovery, making it one of the most challenging questions in modern astrophysics. Recent data analyses have indicated that, in contrast to previous beliefs, dark energy may not be a cosmological constant. This opens a large number of interesting possibilities. In this talk, I will give a quick overview of the field of dark energy, detailing how a unified theoretical framework, along with numerical tools developed over the years, means that the coming decade offers an excellent opportunity to make the most comprehensive and systematic study of fundamental physics beyond the standard model, by exploiting precision cosmological data.
Bio:
Prof Baojiu Li is a theoretical and computational cosmologist at Durham University, UK. He obtained his BSc degree from Tsinghua University in 2004, MPhys from the Chinese University of Hong Kong in 2006, and PhD from University of Cambridge in 2009. After being a Junior Research Fellow at Queens' College, Cambridge, he moved to Durham University as a Lecturer in 2011, later becoming a Senior Lecturer (2014), Reader (2016) and Professor (2019). He works on a range of topics in cosmology, including dark energy, dark matter, gravity, neutrinos and the large-scale structure of the Universe, as well as numerical relativity. Baojiu is an awardee of the Royal Astronomical Society Fowler Award, and has been funded by a European Research Council (ERC) Starting Grant (2017-2022) and an ERC Advanced Grant (2025-2030)
Time: 13:00-14:00, 19/January, Monday
Venue: Room 506 (Large seminar room), Department of Astronomy
