Paul Saffin

Contact

• workRoom B104 Centre for Astronomy & Particle Physics
  University Park
  Nottingham
  NG7 2RD
  UK
• work0115 951 5133
• paul.saffin@nottingham.ac.uk

Research Summary

My main research interests in theoretical physics are to understand various structures in quantum field theory and theories of gravity. Of particular interest are the non-perturbative properties of… read more

Recent Publications

• SKLIROS, DIMITRI P., COPELAND, EDMUND J. and SAFFIN, PAUL M., 2017. Highly excited strings I: Generating function NUCLEAR PHYSICS B. 916, 143-207
• MOU, ZONG-GANG, SAFFIN, PAUL M. and TRANBERG, ANDERS, 2017. Simulations of Cold Electroweak Baryogenesis: hypercharge U(1) and the creation of helical magnetic fields JOURNAL OF HIGH ENERGY PHYSICS.
• MOU, ZONG-GANG, SAFFIN, PAUL M. and TRANBERG, ANDERS, 2017. Simulations of Cold Electroweak Baryogenesis: finding the optimal quench time JOURNAL OF HIGH ENERGY PHYSICS.
• MOU, ZONG-GANG, SAFFIN, PAUL M., TOGNARELLI, PAUL and TRANBERG, ANDERS, 2017. Simulations of "tunnelling of the 3rd kind" JOURNAL OF HIGH ENERGY PHYSICS.

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Current Research

My main research interests in theoretical physics are to understand various structures in quantum field theory and theories of gravity. Of particular interest are the non-perturbative properties of field theories, such as solitonic objects, and their dynamical behaviour. This includes the study of supersymmetric solutions of supergravity; the implications of braneworlds; the interaction of topological defects; scaling solutions in cosmology; reheating after inflation; the statistical properties of cosmic string networks. This is an incredibly rich area of study and allows one to learn many skills, from analytic techniques to large-scale computer simulations. More information of the particle-theory group may be found at Nottingham Particle theory GroupTEACHINGF34AG1  Gravity module

• SKLIROS, DIMITRI P., COPELAND, EDMUND J. and SAFFIN, PAUL M., 2017. Highly excited strings I: Generating function NUCLEAR PHYSICS B. 916, 143-207
• MOU, ZONG-GANG, SAFFIN, PAUL M. and TRANBERG, ANDERS, 2017. Simulations of Cold Electroweak Baryogenesis: hypercharge U(1) and the creation of helical magnetic fields JOURNAL OF HIGH ENERGY PHYSICS.
• MOU, ZONG-GANG, SAFFIN, PAUL M. and TRANBERG, ANDERS, 2017. Simulations of Cold Electroweak Baryogenesis: finding the optimal quench time JOURNAL OF HIGH ENERGY PHYSICS.
• MOU, ZONG-GANG, SAFFIN, PAUL M., TOGNARELLI, PAUL and TRANBERG, ANDERS, 2017. Simulations of "tunnelling of the 3rd kind" JOURNAL OF HIGH ENERGY PHYSICS.
• SAFFIN, PAUL M., 2017. Recrudescence of massive fermion production by oscillons JOURNAL OF HIGH ENERGY PHYSICS.
• EMOND, WILLIAM T. and SAFFIN, PAUL M., 2016. Disformally self-tuning gravity JOURNAL OF HIGH ENERGY PHYSICS.
• AVILEZ-LOPEZ, ANA, PADILLA, ANTONIO, SAFFIN, PAUL M. and SKORDIS, CONSTANTINOS, 2015. The Parametrized Post-Newtonian-Vainshteinian Formalism JCAP. 1506(06), 044
• KALOPER, NEMANJA, PADILLA, ANTONIO, SAFFIN, PAUL and STEFANYSZYN, DAVID, 2015. Unitarity and the Vainshtein Mechanism Phys. Rev.. D91(4), 045017
• MOU, ZONG-GANG, SAFFIN, PAUL M. and TRANBERG, ANDERS, 2015. Cold Baryogenesis from first principles in the two-Higgs doublet model with fermions JOURNAL OF HIGH ENERGY PHYSICS.
• SAFFIN, PAUL M., TOGNARELLI, PAUL and TRANBERG, ANDERS, 2014. Oscillon lifetime in the presence of quantum fluctuations JOURNAL OF HIGH ENERGY PHYSICS.
• COPELAND, EDMUND J., SAFFIN, PAUL M. and ZHOU, SHUANG-YONG, 2014. Charge-Swapping Q Balls PHYSICAL REVIEW LETTERS. 113(23),
• SKLIROS, DIMITRI P., COPELAND, EDMUND J. and SAFFIN, PAUL M., 2013. Duality and Decay of Macroscopic F Strings PHYSICAL REVIEW LETTERS. 111(4),
• GORDON, CHRIS and SAFFIN, PAUL M., 2013. Adiabatic and isocurvature perturbation projections in multi-field inflation JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS.
• ZHOU, SHUANG-YONG, COPELAND, EDMUND J., EASTHER, RICHARD, FINKEL, HAL, MOU, ZONG-GANG and SAFFIN, PAUL M., 2013. Gravitational waves from oscillon preheating JOURNAL OF HIGH ENERGY PHYSICS.
• MOU, ZONG-GANG, SAFFIN, PAUL M. and TRANBERG, ANDERS, 2013. Ensemble fermions for electroweak dynamics and the fermion preheating temperature JOURNAL OF HIGH ENERGY PHYSICS.
• CHARMOUSIS, C, COPELAND, EJ, PADILLA, A and SAFFIN, PM, 2012. General Second-Order Scalar-Tensor Theory And Self-Tuning Physical Review Letters. 108(5), -
• SAFFIN, PAUL M. and TRANBERG, ANDERS, 2012. Dynamical simulations of electroweak baryogenesis with fermions JHEP. 1202, 102
• CHARMOUSIS, CHRISTOS, COPELAND, EDMUND J., PADILLA, ANTONIO and SAFFIN, PAUL M., 2012. Self-tuning and the derivation of a class of scalar-tensor theories Phys.Rev.. D85, 104040
• SAFFIN, PAUL M., 2012. The covariance of multi-field perturbations, pseudo-susy and f_NL JCAP. 1209, 002
• PADILLA, ANTONIO and SAFFIN, PAUL M., 2012. Classical Duals, Legendre Transforms and the Vainshtein Mechanism JHEP. 1207, 122
• COPELAND, E.J., PADILLA, A. and SAFFIN, P.M., 2012. The cosmology of the Fab-Four Journal of Cosmology and Astroparticle Physics. 2012(12), 026
• OMOTANI, J, SAFFIN, P M and LOUKO, J, 2011. Colliding branes and big crunches Physical Review D. 84(6), 063526
• PADILLA, A., SAFFIN, P.M. and ZHOU, S.-Y., 2011. Bi-galileon theory II: phenomenology Journal of High Energy Physics. 2011, 099
• PADILLA, A., SAFFIN, P.M. and ZHOU, S.-Y., 2011. Multi-Galileons, solitons, and Derrick’s theorem Physical Review D. 83(4), 045009
• SAFFIN, PAUL M. and TRANBERG, ANDERS, 2011. Real-time Fermions for Baryogenesis Simulations JHEP. 1107, 066
• MOSS, IAN G., OMOTANI, JOHN T. and SAFFIN, PAUL M., 2011. Reducing heterotic M-theory to five dimensional supergravity on a manifold with boundary JHEP. 1110, 088
• BUTCHER, NA and SAFFIN, PM, 2010. The Gravitational Dynamics Of Warped Throats Journal Of High Energy Physics. -
• PADILLA, A, SAFFIN, PM and ZHOU, SY, 2010. Bi-Galileon Theory I: Motivation And Formulation Journal Of High Energy Physics. -
• ZHOU, S.-Y., COPELAND, E.J. and SAFFIN, P.M., 2009. Cosmological constraints on f(G) dark energy models Journal of Cosmology and Astroparticle Physics. 2009(7), 009
• BEVIS, N, COPELAND, EJ, MARTIN, PY, NIZ, G, POURTSIDOU, A, SAFFIN, PM and STEER, DA, 2009. Evolution And Stability Of Cosmic String Loops With Y-Junctions Physical Review D. 80(12), -
• CHARMOUSIS, C., NIZ, G., PADILLA, A. and SAFFIN, P.M., 2009. Strong coupling in Hořava gravity Journal of High Energy Physics. 2009(8), 070
• SAFFIN, PM, PADILLA, A and COPELAND, EJ, 2008. Transmission Of An Inhomogeneous State Via Resonant Tunnelling Journal Of High Energy Physics. -
• BEVIS, N. and SAFFIN, P.M., 2008. Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics Physical Review D. 78(2), 023503
• TSUMAGARI, MI, COPELAND, EJ and SAFFIN, PM, 2008. Some Stationary Properties Of A Q-Ball In Arbitrary Space Dimensions Physical Review D. 78(6), -
• BUTCHER, NA and SAFFIN, PM, 2008. The Evolution Of Conifolds Journal Of High Energy Physics. -
• COPELAND, EDMUND J., PADILLA, ANTONIO and SAFFIN, PAUL M., 2008. No resonant tunneling in standard scalar quantum field theory JHEP. 0801, 066
• KARTHAUSER, J.L., SAFFIN, P.M. and HINDMARSH, M., 2007. Cosmology with twisted tori (14 pages) PHYSICAL REVIEW -SERIES D-. VOL 76(NUMB 10), 104039
• SAFFIN, PM and TRANBERG, A, 2007. Oscillons And Quasi-Breathers In D+1 Dimensions Journal Of High Energy Physics. -
• SAFFIN, PM and TRANBERG, A, 2007. Particle Transfer In Braneworld Collisions Journal Of High Energy Physics. -
• BUTCHER, NA and SAFFIN, PM, 2007. Singular Manifolds, Topology Change And The Dynamics Of Compactification Journal Of High Energy Physics. -
• SAFFIN, PM and TRANBERG, A, 2007. The Fermion Spectrum In Braneworld Collisions Journal Of High Energy Physics. -
• KARTHAUSER, J. L. P. and SAFFIN, P. M., 2006. Scaling solutions and geodesics in moduli space CLASSICAL AND QUANTUM GRAVITY. VOL 23(NUMB 14), 4615-4624
• PALTI, E, SAFFIN, P and URRESTILLA, J, 2006. The Effects Of Inhomogeneities On The Cosmology Of Type Iib Conifold Transitions Journal Of High Energy Physics. -
• MICU, A, PALTI, E and SAFFIN, PM, 2006. M-Theory On Seven-Dimensional Manifolds With Su(3) Structure Journal Of High Energy Physics. -
• HINDMARSH, M and SAFFIN, PM, 2006. Scaling In A Su(2)/Z(3) Model Of Cosmic Superstring Networks Journal Of High Energy Physics. -
• COPELAND, E.J. and SAFFIN, P.M., 2005. On the evolution of multi string networks Journal of High Energy Physics. 11(023), 1-13
• LUKAS, A. and SAFFIN, P.M., 2005. M-theory compactification, fluxes, and AdS₄ Physical Review D: Particles, Fields, Gravitation & Cosmology. VOL 71(NUMB 4), 046005/1-15
• LUKAS, A., PALTI, E. and SAFFIN, P.M., 2005. Type IIB conifold transitions in cosmology Physical Review D: Particles, Fields, Gravitation & Cosmology. 71(6), 066001
• SAFFIN,P.M., 2005. A practical model for cosmic (p,q) superstrings Journal of High Energy Physics. 2005(9), Article No. 011 (12 pages)
• SAFFIN, P. M., 2005. Type IIA Killing spinors and calibrations (8 pages) Physical Review D: Particles, Fields, Gravitation & Cosmology. VOL 71(NUMB 2), 025018
• KARTHAUSER, J. L. and SAFFIN, P. M., 2005. Dynamics of coset dimensional reduction (16 pages) PHYSICAL REVIEW -SERIES D-. VOL 73(NUMB 8), 084027
• PALTI, E, SAFFIN, PM and COPELAND, EJ, 2004. Dynamics Of Q-Balls In An Expanding Universe Physical Review D. 70(8), -
• BRECHER, D., GREGORY, J. P. and SAFFIN, P. M., 2003. String theory and the classical stability of plane waves (12 pages) Physical Review D: Particles, Fields, Gravitation & Cosmology. VOL 67(PART 4), 045014
• BRECHER, D. and SAFFIN, P. M., 2003. Decay modes of intersecting fluxbranes (9 pages) Physical Review D: Particles, Fields, Gravitation & Cosmology. VOL 67(PART 12), 125013
• COPELAND, EJ, SAFFIN, PM and STEER, DA, 2003. Singular Tachyon Kinks From Regular Profiles Physical Review D. 68(6), -
• CHEN, C.-M., GAL TSOV, D. V. and SAFFIN, P. M., 2002. Supergravity fluxbranes in various dimensions Physical Review D: Particles, Fields, Gravitation & Cosmology. VOL 65(PART 8), 084004
• SAFFIN, P.M., 2001. Gravitating fluxbranes Physical Review D: Particles, Fields, Gravitation & Cosmology. 64(2), 024014
• BRECHER, D. and SAFFIN, P. M., 2001. A note on the supergravity description of dielectric branes Nuclear Physics. VOL 613(NUMBER 1-2), 218-236
• SAFFIN, P. M., 2001. Fluxbranes from p-branes Physical Review D: Particles, Fields, Gravitation & Cosmology. VOL 64(PART 10), 104008
• RAJANTIE, A, SAFFIN, PM and COPELAND, EJ, 2001. Electroweak Preheating On A Lattice Physical Review D. 63(12), -
• BARROW, J. D., GASPAR, Y. and SAFFIN, P. M., 2000. Some exact non-vacuum Bianchi VI~0 and VII~0 instantons CLASSICAL AND QUANTUM GRAVITY. VOL 17(PART 6), 1435-1446
• COPELAND, E. J., SAFFIN, P. M. and TORNKVIST, O., 2000. Phase equilibration and magnetic field generation in U(1) bubble collisions (22 pages) PHYSICAL REVIEW -SERIES D-. VOL 61(PART 10), 105005
• COPELAND, EJ, GRAY, JA and SAFFIN, PM, 2000. Gravitational Instantons And Internal Dimensions Journal Of High Energy Physics. -
• SAFFIN, P.M., 1999. Tunnelling with Bianchi IX instantons PHYSICS LETTERS B. VOL 465(NUMBER 1-4), 101-107
• SAFFIN, P. M., 1999. Tiling with Almost-BPS-Invariant Domain-Wall Junctions PHYSICAL REVIEW LETTERS. VOL 83(NUMBER 21), 4249-4252
• SAFFIN, P. M., MAZUMDAR, A. and COPELAND, E. J., 1998. Instantons from low energy string actions PHYSICS LETTERS B. VOL 435(ISSUE 1-2), 19-24
• SAFFIN, P. M. and COPELAND, E. J., 1998. Electrically charged sphalerons PHYSICAL REVIEW -SERIES D-. VOL 57(NUMBER 8), 5064-5069
• SAFFIN, P. M. and COPELAND, E. J., 1997. Bubble collisions in SU(2) x U(1) gauge theory and the production of nontopological strings PHYSICAL REVIEW -SERIES D-. VOL 56(NUMBER 2), 1215-1219
• COPELAND, E. J. and SAFFIN, P. M., 1996. Bubble collisions in Abelian gauge theories and the geodesic rule PHYSICAL REVIEW -SERIES D-. VOL 54(NUMBER 10), 6088-6094