Dr Seshadri Nadathur
I am a Research Fellow in cosmology at the Institute of Cosmology and Gravitation at the University of Portsmouth. I study the properties of dark energy, dark matter and the expansion history of the Universe using data on its large-scale structure gathered by galaxy surveys. My research is currently supported by a grant from the UK Space Agency. I previously held a Marie Sklodowska-Curie Individual Fellowship award from the European Commission's Horizon 2020 project, and the ICG's Dennis Sciama Postdoctoral Fellowship.
I took my PhD (DPhil) in theoretical physics from the University of Oxford in 2011, where I held a Domus scholarship and an Overseas Research Award, and held short postdoctoral positions at the University of Bielefeld and the University of Helsinki before moving to Portsmouth. Prior to starting my PhD, I held a Rhodes Scholarship at Oxford (India & Trinity, 2005).
Currently, my research focuses on methods of analysing data gathered by large galaxy redshift surveys in order to understand the effects of dark energy and dark matter on the rate of expansion and the distribution of matter in the Universe. I use a combination of many techniques to achieve this, including modelling redshift-space distortions, galaxy clustering, gravitational lensing, cross-correlations with the cosmic microwave background and structure formation. I am particularly interested in the use of cosmic voids – low-density regions identified in 3D maps of the galaxy distribution – as exciting tools to enhance the effectiveness of all these analyses. I also work on theoretical models of decaying dark matter and inflation in the early Universe.
I work within the following large international collaborations: Euclid (where I am developing algorithms for data processing in the Science Ground Segment, and co-chair a working group on voids), the Dark Energy Spectroscopic Instrument (DESI), the extended Baryon Oscillation Spectroscopic Survey (eBOSS), and the Dark Energy Survey (DES).
My research has been featured in the media on a few occasions (see links above). I have done media interviews for TV (Magic Numbers: Hannah Fry's Mysterious World of Maths, BBC4), radio (BBC Radio Solent) and print (New Scientist, The Conversation). I have given public lectures on astronomy topics for local audiences, including at the Winchester Science Festival. I am available for media opportunities and public talks.