Quantum Field Theory, Construction of physical charges in gauge theories, Quantum Field Theories in external fields, Constrained systems.

David came to Plymouth after post-doctoral research at Salt Lake City, Warwick, Glasgow and the Dublin Institute of Advanced Studies. He regularly acts as referee for the top international journals in particle physics. He has been invited to act as an External PhD examiner at the Universities of Durham and Liverpool. As Associate Head of School, David actively represents the Mathematical Sciences at Plymouth University.

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