Imperial College London


Faculty of Natural SciencesDepartment of Physics

Professor of Experimental Astrophysics



+44 (0)20 7594 7552t.sumner




505Blackett LaboratorySouth Kensington Campus





  Professional Career

Tim Sumner obtained his first degree in Physics from Sussex University in 1974.  His DPhil in Experimental Physics was then carried out partly at Sussex University and partly at the Institut Laue-Langevin in Grenoble helping to start up an experiment to search for the electric dipole moment of the neutron using ultra-cold neutrons.  In 1979 he moved to Imperial College to take up a Research Associate placement within the Cosmic-Ray and Space Physics group to work on instrumentation for high-energy gamma-ray astonomy.  In 1984 the group became involved in the x-ray satellite ROSAT and Tim Sumner became the local project manager responsible for the delivery of flight hardware.  ROSAT was launched in 1990.  At about the same time he was made a lecturer within the group which had by then changed names to the Astrophysics group and he started two new research lines; direct dark matter searches and gravitational physics measurements using space missions. 

Direct dark matter searches began within the so-called UK Dark Matter Collaboration and started out with NaI based instruments and more recently with xenon-based instruments.  Tim Sumner was Spokesperson for the UKDMC from 2002-2007.  In 2000 he initiated the international ZEPLIN-III dark matter search experiment which was carried out between 2000 and 2011 in the Boulby mine in the UK.  He was PI and Spokesperson from 2000-2010.  The experiement achieved some of the best results in the world.  The next phase involves collaboration with our US colleagues on the LUX and, eventually, LUX-ZEPLIN projects to be carried out in the Homestake gold mine. 

The work on space missions includes LISA, a gravitational wave observatory in space, and it precursor, LISAPF, STEP, a mission to test the equivalence principle in space and GAUGE which is a new proposal to the European Space Agency.  As a member of the LISA International Science Team, he has been involved in the development of the LISA mission since its inception in the early 1990s.  His team are currently providing flight hardware for the technology demonstrator mission, LISAPF.  STEP is a proposed ESA/NASA mission with Tim Sumner as the European PI.  He recently proposed GAUGE to ESA as a mission in fundamental physics to probe the interfaces between gravity and quantum mechanics.

Tim Sumner  was promoted through Senior Lecturer, Reader and eventually to Professor in Experimental Astrophysics in 2001.  

Selected Publications

Journal Articles

Akimov DY, Araujo HM, Barnes EJ, et al., 2010, Limits on inelastic dark matter from ZEPLIN-III, Physics Letters B, Vol:692, ISSN:0370-2693, Pages:180-183

Amaro-Seoane P, Aoudia S, Babak S, et al., 2013, eLISA/NGO: astrophysics and cosmology in the gravitational-wave millihertz regime, Gravitational Wave Notes, Vol:6, ISSN:1868-1921, Pages:1-110

Amaro-Seoane P, Aoudia S, Babak S, et al., 2012, Low-frequency gravitational-wave science with eLISA/NGO, Classical and Quantum Gravity, Vol:29, ISSN:0264-9381

Lebedenko VN, Araujo HM, Barnes EJ, et al., 2009, Limits on the Spin-Dependent WIMP-Nucleon Cross Sections from the First Science Run of the ZEPLIN-III Experiment, Physical Review Letters, Vol:103, ISSN:0031-9007

Lebedenko VN, Araujo HM, Barnes EJ, et al., 2009, Results from the first science run of the ZEPLIN-III dark matter search experiment, Physical Review D, Vol:80, ISSN:1550-7998


Armano M, Benedetti M, Bogenstahl J, et al., 2009, LISA Pathfinder: the experiment and the route to LISA, 7th International LISA Symposium, IOP PUBLISHING LTD, ISSN:0264-9381

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