Career
- 1974-1976: Research Fellow, Girton College, Cambridge
- 1976-present: Official Fellow, College Lecturer and Director of Studies in Mathematics, Girton College
- 1991-1994: Temporary Lecturer, DAMTP, Cambridge
- 1994-2002: Assistant Director of Research, DAMTP
- 2002-present: Reader in Mathematical Physics, DAMTP
Research
Discrete gravity, both classical and quantum, mainly based on Regge calculus; spin foam models. The role of holonomy in quantum gravity. The variation of Newton's constant.
Selected Publications
- Discrete structures in physics, J. Math. Phys. 41 (2000) 3964-3984 (with T. Regge).
- 6j-symbols and discrete quantum gravity, Nucl. Phys. B (Proc. Suppl.) 88 (2000) 124-131.
- Flat and curved space-times: Second edition, Oxford University Press (2000) (with G. F. R. Ellis).
- Gluing 4-simplices: a derivation of the Barrett-Crane spin foam model for Euclidean quantum gravity, Phys. Rev. D63 (2001) 024022 (with D. Oriti).
- Constraints on area variables in Regge calculus, Class. Quantum Grav. 18 (2001) L43-46 (with J. M\"akel\"a).
- Non-perturbative gravity and the spin of the lattice graviton, Phys. Rev. D70 (2004) 124007 (with H. W. Hamber).
- Area Regge calculus and discontinuous metrics, Class. Quantum Grav. 21 (2004) 4865-4880 (with C. J. Wainwright).
- Nonlocal effective gravitational field equations and the running of Newton's constant G, Phys. Rev. D72 (2005) 04426 (with H. W. Hamber).
- Nonlocal effective field equations for quantum cosmology, Mod. Phys. Lett. A 21 (2006) 735 (with H. W. Hamber).
- Quantum gravity in large dimensions, Phys. Rev. D73 (2006) 04403 (with H. W. Hamber).
- Discrete quantum gravity, Journal of Physics: Conference Series 33 (2006) 38-48.
- Bertha Swirles Jeffreys, in Out of the Shadows: Contributions of Twentieth-Century Women to Physics, edited by Nina Byers and Gary Williams (CUP, 2006).
- Constraints on the gravitational scaling dimension from the non-local effective field equations, Phys. Lett. B643 (2006) 228 (with H. W. Hamber).
- Renormalization group running of Newton's G: the static isotropic case, Phys. Rev. D75 (2007) 084014 (with H. W. Hamber).
- Gravitational Wilson loop and large scale curvature, Phys. Rev. D76 (2007) 84008 (with H. W.Hamber).
Publications
Quantum gravity in large dimensions
– Physical Review D - Particles, Fields, Gravitation and Cosmology
(2006)
73,
044031
(DOI: 10.1103/physrevd.73.044031)
Nonlocal effective gravitational field equations and the running of Newton's constant G
– Physical Review D - Particles, Fields, Gravitation and Cosmology
(2005)
72,
1
(DOI: 10.1103/physrevd.72.044026)
Nonperturbative gravity and the spin of the lattice graviton
– Physical Review D - Particles, Fields, Gravitation and Cosmology
(2004)
70,
124007
(DOI: 10.1103/physrevd.70.124007)
Area Regge calculus and discontinuous metrics
– Classical and Quantum Gravity
(2004)
21,
4865
(DOI: 10.1088/0264-9381/21/21/008)
A absorption model with correct Regge cut branch point behaviour
– Journal of Physics A: Mathematical, Nuclear and General
(2001)
7,
710
(DOI: 10.1088/0305-4470/7/6/007)
Constraints on area variables in Regge calculus
– Classical and Quantum Gravity
(2001)
18,
L43
(DOI: 10.1088/0264-9381/18/4/102)
Gluing 4-simplices: A derivation of the Barrett-Crane spin foam model for Euclidean quantum gravity
– Physical Review D
(2000)
6302,
024022
(DOI: 10.1103/PhysRevD.63.024022)
Simplicial minisuperspace models in the presence of a massive scalar field with arbitrary scalar coupling eta Rphi2
– Classical and Quantum Gravity
(2000)
17,
1827
(DOI: 10.1088/0264-9381/17/8/306)
6j-symbols and discrete quantum gravity
– Nuclear Physics B - Proceedings Supplements
(2000)
88,
124
Discrete structures in gravity
– Journal of Mathematical Physics
(2000)
41,
3964
(DOI: 10.1063/1.533333)
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