The University of Southampton
Telephone:
+442380593758
Email:
T.R.Morris@soton.ac.uk

Professor Tim Morris

Prof Tim R. Morris is professor of theoretical physics, Fellow of the Institute of Physics, Fellow of the Higher Education Academy, and Head of the Theoretical High Energy Physics theory group, one of the largest groups in the UK. He has previously been both head and deputy head of department. For the year 2017/18, Tim has a Royal Society Leverhulme Trust Senior Fellowship, devoted full time to research into the Wilsonian renormalization group in quantum gravity. His recent work on asymptotic safety solved for the first time the fixed point structure in the infinite dimensional $f(R)$ approximation. He has led in developing these approximations in particular in the large curvature domain. He has begun the development of a manifestly diffeomorphism invariant and background independent formalism. His work is demonstrating that there is much more to the renormalization group properties of quantum gravity than has been assumed.

Tim's very first research was in Quantum Chemistry whilst he was still at school, and later when he was a Scholar at Cambridge University. His PhD research was on Instantons in Super Yang-Mills, at Southampton. In 1985 he won a prestigious Harkness Fellowship to do post-doctoral research at Princeton, NJ USA. While there, he was amongst the first to apply Polyakov's new methods to open strings, and to work on Witten's string field theory. In 1987 he returned to a lectureship in Southampton. Following work at Fermilab on research leave in 1989, he discovered a way of using complex matrix models to formulate and solve various simple string theories non-perturbatively. In 1992 he won simultaneously both a CERN fellowship and SERC/PPARC Advanced Fellowship. During these fellowships, he developed the Wilsonian/exact renormalization group into a powerful methodology, both calculationally and conceptually. He discovered, independently the flow equation for the effective average action proposed by Wetterich a few months previously (which was in turn a rediscovery of the flow equation first introduced by Nicoll and Chang in 1977), proposed the derivative expansion (now established as one of the most powerful of approximation methods in this framework), showed how to solve for fixed points and quantised eigenoperators in these infinite dimensional approximations, and recover analytically the correct behaviour in terms of renormalised couplings. He developed a manifestly gauge invariant exact renormalization group, a long standing unsolved problem, which at the same time solved other long standing problems: continuum computations without gauge fixing, and furnishing a physical gauge invariant regulator.

Tim has worked on a number of other areas, including MHV rules, beyond the Standard Model, and cosmology, held a number of other grants and fellowships, and has had extensive experience at both the undergraduate and graduate level. He is an accomplished pianist; he obtained a diploma from the Royal Academy in 1980, won the audience prize in the Pianist-Yamaha competition for outstanding amateurs in 2005, and has performed several concertos.

Publications

Arnone, Stefano, Gatti, Antonio, Morris, Tim R. and Rosten, Oliver J. (2004) Exact scheme independence at two loops. Physical Review D, 69 (6), 065009-[13pp]. (doi:10.1103/PhysRevD.69.065009).

Morris, Tim R. (2005) Renormalizable extra-dimensional models. Journal of High Energy Physics, JHEP01 (2), 1-31. (doi:10.1088/1126-6708/2005/01/002).

Morris, Tim R., Arnone, Stefano and Gatti, Antonio (2003) A proposal for a manifestly gauge invariant and universal calculus in Yang-Mills theory. Physical Review D, 67 (8), 085003-[29pp]. (doi:10.1103/PhysRevD.67.085003).

Morris, Tim R., Arnone, Stefano and Gatti, Antonio (2002) Exact scheme independence at one loop. Journal of High Energy Physics, 5, 59. (doi:10.1088/1126-6708/2002/05/059).

Arnone, Stefano, Kubyshin, Yuri A., Morris, Tim R. and Tighe, John F. (2002) Gauge invariant regularization via SU(N|N). International Journal of Modern Physics A, 17 (17), 2283-2330. (doi:10.1142/S0217751X02009722).

Ettle, James H. and Morris, Tim R. (2006) Structure of the MHV-rules Lagrangian. The Journal of High Energy Physics, 8 (3), 1-22. (doi:10.1088/1126-6708/2006/08/003).

Arnone, S., Gatti, A. and Morris, T.R. (2002) A demonstration of scheme independence in scalar ERGs. Acta Physica Slovaca, 52 (6), 615-620.

Arnone, S., Gatti, A. and Morris, T.R. (2002) A manifestly gauge invariant exact renormalization group. 5-th International Conference Renormalization Group 2002 (RG-2002). 10 - 16 Mar 2002.

Arnone, Stefano, Gatti, Antonio and Morris, Tim R. (2002) Manifestly gauge invariant computations. Pre-print, 1-8.

Arnone, S., Gatti, A. and Morris, T.R. (2002) Towards a manifestly gauge invariant and universal calculus for Yang-Mills theory. Acta Physica Slovaca, 52, 621-634.

Arnone, Stefano, Morris, Tim R. and Rosten, Oliver J. (2005) Manifestly gauge invariant QED. The Journal of High Energy Physics, 10, 115-[26pp]. (doi:10.1088/1126-6708/2005/10/115).

Arnone, Stefano, Morris, Tim R. and Rosten, Oliver J. (2006) Manifestly gauge invariant exact renormalization group. Pre-print, 1-24.

Arnone, S., Morris, T.R. and Rosten, O.J. (2007) A generalised manifestly gauge invariant exact renormalisation group for SU(N) Yang-Mills. The European Physical Journal C, 50 (2), 467-504. (doi:10.1140/epjc/s10052-007-0258-y).

Ettle, J.H., Fu, C-H., Fudger, J.P., Mansfield, P.R.W. and Morris, T.R (2007) S-Matrix equivalence theorem evasion and dimensional regularisation with the canonical MHV lagrangian. The Journal of High Energy Physics, 5, 11-43. (doi:10.1088/1126-6708/2007/05/011).

Evans, Nick, Morris, Tim R. and Rosten, Oliver J. (2006) Gauge invariant regularization in the AdS/CFT correspondence and ghost D-branes. Physics Letters B, 635 (2-3), 148-150. (doi:10.1016/j.physletb.2006.02.055).

Rosten, O.J., Morris, T.R. and Arnone, S. (2004) The gauge invariant ERG. High Energy Physics - Theory.

Morris, Tim R. and Rosten, Oliver J. (2006) Manifestly gauge-invariant QCD. Journal of Physics A: Mathematical and General, 39 (37), 11657-11681. (doi:10.1088/0305-4470/39/37/020).

Morris, Tim R. and Rosten, Oliver J. (2006) A manifestly gauge invariant, continuum calculation of the SU(N) Yang-Mills two-loop beta function. Physical Review D, 73 (6), 065003-[33pp]. (doi:10.1103/PhysRevD.73.065003).

Morris, T.R. (2001) An exact RG formulation of quantum gauge theory. International Journal of Modern Physics A, 16 (11), 1899-1911. (doi:10.1142/S0217751X01004554).

Arnone, S., Kubyshin, YU. A., Morris, T.R. and Tighe, J.F. (2001) A gauge invariant regulator for the ERG. International Journal of Modern Physics A, 16 (11), 1989-2001. (doi:10.1142/S0217751X0100461X).

Latorre, José I. and Morris, Tim R. (2001) Scheme independence as an inherent redundancy in quantum field theory. International Journal of Modern Physics A, 16 (11), 2071-2074. (doi:10.1142/S0217751X01004724).

Morris, Tim R. and Tighe, John F. (2001) Convergence of derivative expansions in scalar field theory. International Journal of Modern Physics A, 16 (11), 2095-2100. (doi:10.1142/S0217751X01004761).

Fu, Chih-Hao, Fudger, Jonathan, Mansfield, Paul R.W., Morris, Tim R. and Xiao, Zhiguang (2009) S-matrix equivalence restored. Journal of High Energy Physics, 2009 (6), 35. (doi:10.1088/1126-6708/2009/06/035).

Morris, Tim R. and Xiao, Zhiguang (2008) The canonical transformation and massive CSW vertices for MHV-SQCD. Journal of High Energy Physics, 2008 (12), 28. (doi:10.1088/1126-6708/2008/12/028).

Ettle, James H., Morris, Tim R. and Xiao, Zhiguang (2008) The MHV QCD Lagrangian. Journal of High Energy Physics, 2008 (8), 1-42. (doi:10.1088/1126-6708/2008/08/103).

Morris, Tim R. (2012) Superluminal velocity through near-maximal neutrino oscillations or by being off shell. Journal of Physics G: Nuclear and Particle Physics, 39 (4), 045010-[13pp]. (doi:10.1088/0954-3899/39/4/045010).

Morris, Tim R. and Dietz, Juergen A. (2013) Asymptotic safety in the f(R) approximation. Journal of High Energy Physics, 2013 (108), 1-55. (doi:10.1007/JHEP01(2013)108).

Bridle, I. Hamzaan, Dietz, Juergen A. and Morris, Tim R. (2014) The local potential approximation in the background field formalism. Journal of High Energy Physics, 2014 (93), 1-35. (doi:10.1007/JHEP03(2014)093).

Dietz, Juergen A. and Morris, Tim R. (2013) Redundant operators in the exact renormalisation group and in the f(R) approximation to asymptotic safety. Journal of High Energy Physics, 2013 (64), 1-25. (doi:10.1007/JHEP07(2013)064).

Morris, Tim R. and Preston, Anthony W.H. (2016) Manifestly diffeomorphism invariant classical exact renormalization group. Journal of High Energy Physics, 1-51. (In Press)

Lizana, J.M., Morris, T.R. and Pérez-Victoria, M. (2016) Holographic renormalisation group flows and renormalisation from a Wilsonian perspective. Journal of High Energy Physics, 2016 (198), 1-62. (doi:10.1007/JHEP03(2016)198).

Evans, Nick, Morris, Tim R. and Scott, Marc (2016) Translational symmetry breaking in field theories and the cosmological constant. Physical Review D, 93 (2), 1-9. (doi:10.1103/PhysRevD.93.025019).

Morris, Tim and Bridle, Hamzaan (2016) The fate of non-polynomial interactions in scalar field theory. Physical Review D, 1-35. (In Press)

Dietz, Juergen A. and Morris, Tim R. (2015) Background independent exact renormalization group for conformally reduced gravity. Journal of High Energy Physics, 2015 (118), 1-47. (doi:10.1007/JHEP04(2015)118).

Dietz, Juergen, Morris, Tim and Slade, Zoe (2016) Fixed point structure of the conformal factor field in quantum gravity. Physical Review D, 94 (124014), 1-30. (doi:10.1103/PhysRevD.94.124014).

Morris, Tim R. (2016) Large curvature and background scale independence in single-metric approximations to asymptotic safety. Journal of High Energy Physics, 1-30. (doi:10.1007/JHEP11(2016)160).

Gonzales-Martin, Sergio, Morris, Tim R. and Slade, Zoe H. (2017) Asymptotic solutions in asymptotic safety. Physical Review D. (doi:10.1103/PhysRevD.95.106010).

Bateman, James, Mchardy, Ian, Merle, Alexander, Morris, Tim R. and Ulbricht, Hendrik (2015) On the existence of low-mass dark matter and its direct detection. Scientific Reports, 5. (doi:10.1038/srep08058).

Falls, Kevin and Morris, Tim R. (2018) Conformal anomaly from gauge fields without gauge fixing. Physical Review D, 97 (6). (doi:10.1103/PhysRevD.97.065013).

Morris, Timothy (2018) Perturbatively renormalizable quantum gravity. International Journal of Modern Physics B, 1-6.

Morris, Tim R. (2018) Renormalization group properties in the conformal sector: towards perturbatively renormalizable quantum gravity. The Journal of High Energy Physics, 2018 (24). (doi:10.1007/JHEP08(2018)024).

Kellett, Matthew P. and Morris, Timothy R. (2018) Renormalization group properties of the conformal mode of a torus. Classical and Quantum Gravity, 35. (doi:10.1088/1361-6382/aad06e).

Morris, Tim R. (2018) Quantum gravity, renormalizability and diffeomorphism invariance. Scipost Physics, 5. (doi:10.21468/SciPostPhys.5.4.040).

Morris, Timothy (2016) Background independence in a background dependent renormalization group. Physical Review D, D94 (2), 1-15. (doi:10.1103/PhysRevD.94.024007).

Morris, Tim R. and Percacci, Roberto (2019) Trace anomaly and infrared cutoffs. Physical Review D. (In Press)

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