Dr Warren Perkins

Reader, Physics

+44 (0) 1792 295011

w.perkins@swansea.ac.uk

Office - 502
Fifth Floor
Vivian Building
Singleton Campus

Available For Postgraduate Supervision

Research Links

https://orcid.org/0000-0002-4434-8178

About

After attending secondary school near Manchester, studied physics at Trinity College Cambridge, where he developed a keen interest in rowing. Remaining in Cambridge, where he completed his Ph.D. in 1991, and after research work at the University of Sussex, moved to Swansea in 1993. His research interests centre on modern techniques for calculating perturbative scattering amplitudes in gauge theories of particle physics. Outside physics Warren enjoys hill walking and supporting Notts County.

Areas Of Expertise

Perturbative scattering amplitudes in gauge theories

Publications

Research Highlights

Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Diagrammar in an extended theory of gravity. Physics Letters B, 771, 230-234.
https://doi.org/10.1016/j.physletb.2017.05.052, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa32149
Bjerrum-Bohr, N., Dunbar, D., & Perkins, W. (2008). Analytic structure of three-mass triangle coefficients. Journal of High Energy Physics, 2008(04), 038-038.
https://doi.org/10.1088/1126-6708/2008/04/038, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1150
Dunbar, D., Ettle, J., & Perkins, W. (2010). Augmented recursion for one-loop gravity amplitudes. Journal of High Energy Physics, 2010(6), 27
https://doi.org/10.1007/JHEP06(2010)027, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1152
Bidder, S., Bjerrum-Bohr, N., Dunbar, D., & Perkins, W. (2005). One-loop gluon scattering amplitudes in theories with supersymmetries. Physics Letters B, 612(1-2), 75-88.
https://doi.org/10.1016/j.physletb.2005.02.045, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1541
Bidder, S., Perkins, W., & Risager, K. (2005). One-loop NMHV amplitudes involving gluinos and scalars in Script N = 4 gauge theory. Journal of High Energy Physics, 2005(10), 17 pages-003.
https://doi.org/10.1088/1126-6708/2005/10/003, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1542
Bjerrum-Bohr, N., Dunbar, D., Ita, H., Perkins, W., & Risager, K. (2006). MHV-vertices for gravity amplitudes. Journal of High Energy Physics, 2006(01), 20 pages-009.
https://doi.org/10.1088/1126-6708/2006/01/009, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1543
Bjerrum-Bohr, N., Dunbar, D., Ita, H., Perkins, W., & Risager, K. (2006). The no-triangle hypothesis for Script N = 8 supergravity. Journal of High Energy Physics, 2006(12), 43 pages-072.
https://doi.org/10.1088/1126-6708/2006/12/072, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1544
Dunbar, D., Ettle, J., & Perkins, W. (2011). Perturbative expansion of N<8 Supergravity. Physical Review D, 83(6)
https://doi.org/10.1103/PhysRevD.83.065015, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7264
Dunbar, D., Ettle, J., & Perkins, W. (2010). Augmented Recursion For One-loop Amplitudes. Nuclear Physics B - Proceedings Supplements, 205-206-79.
https://doi.org/10.1016/j.nuclphysbps.2010.08.022, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7265
Perkins, W. & Warrick, E. (2009). Unitarity Methods For One-Loop QCD Amplitudes. Nuclear Physics B - Proceedings Supplements, 186-85.
https://doi.org/10.1016/j.nuclphysbps.2008.12.018, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7267

All Research

Journal Articles

Dalgleish, A., Dunbar, D., Perkins, W., & Strong, J. (2020). Full color two-loop six-gluon all-plus helicity amplitude. Physical Review D, 101(7)
https://doi.org/10.1103/physrevd.101.076024, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa53935
Dunbar, D., Perkins, W., & Strong, J. (2020). n -point QCD two-loop amplitude. Physical Review D, 101(7), 076001-1-076001-10.
https://doi.org/10.1103/physrevd.101.076001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa53395
Dunbar, D., Godwin, J., Perkins, W., & Strong, J. (2020). Color dressed unitarity and recursion for Yang-Mills two-loop all-plus amplitudes. Physical Review D, 101(1)
https://doi.org/10.1103/physrevd.101.016009, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa53063
Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2018). Loop amplitudes in an extended gravity theory. Physics Letters B, 780, 41-47.
https://doi.org/10.1016/j.physletb.2018.02.046, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa36776
Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Diagrammar in an extended theory of gravity. Physics Letters B, 771, 230-234.
https://doi.org/10.1016/j.physletb.2017.05.052, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa32149
Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Analytic all-plus-helicity gluon amplitudes in QCD. Physical Review D, 96(11)
https://doi.org/10.1103/PhysRevD.96.116013, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa36320
Dunbar, D., Jehu, G., & Perkins, W. (2017). Two-loop gravity amplitudes from four dimensional unitarity. Physical Review D, 95(4)
https://doi.org/10.1103/PhysRevD.95.046012, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa31619
Dunbar, D. & Perkins, W. (2016). N=4 supergravity next-to-maximally-helicity-violating six-point one-loop amplitude. Physical Review D, 94(12)
https://doi.org/10.1103/PhysRevD.94.125027, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa25889
Dunbar, D. & Perkins, W. (2016). Two-Loop Six Gluon All-Plus Helicity Amplitude. Physical Review Letters, 117(6)
https://doi.org/10.1103/physrevlett.117.061602, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa28112
Dunbar, D., Jehu, G., & Perkins, W. (2016). Two-loop n-point all-plus helicity amplitude. Physical Review D, 93(12)
https://doi.org/10.1103/PhysRevD.93.125006, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27356
Dunbar, D. & Perkins, W. (2016). Two-loop five-point all-plus helicity Yang-Mills amplitude. Physical Review D, 93(8)
https://doi.org/10.1103/physrevd.93.085029, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27047
Alston, S., Dunbar, D., & Perkins, W. (2015). n-point amplitudes with a single negative-helicity graviton. Physical Review D, 92(6)
https://doi.org/10.1103/PhysRevD.92.065024, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa22986
Dunbar, D., Ettle, J., & Perkins, W. (2012). Constructing gravity amplitudes from real soft and collinear factorization. Physical Review D, 86(2), 026009
https://doi.org/10.1103/PhysRevD.86.026009, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa8451
Dunbar, D., Ettle, J., & Perkins, W. (2012). Maximal-Helicity-Violating n-Point One-Loop Amplitude in N=4 Supergravity. Physical Review Letters, 108(6), 061603
https://doi.org/10.1103/PhysRevLett.108.061603, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7257
Alston, S., Dunbar, D., & Perkins, W. (2012). Complex factorization and recursion for one-loop amplitudes. Physical Review D, 86(8), 085022
https://doi.org/10.1103/PhysRevD.86.085022, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa13423
Dunbar, D., Ettle, J., & Perkins, W. (2011). Perturbative expansion of N<8 Supergravity. Physical Review D, 83(6)
https://doi.org/10.1103/PhysRevD.83.065015, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7264
Dunbar, D., Ettle, J., & Perkins, W. (2011). Obtaining one-loop gravity amplitudes using spurious singularities. Physical Review D, 84(12)
https://doi.org/10.1103/PhysRevD.84.125029, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7259
Dunbar, D., Ettle, J., & Perkins, W. (2010). Augmented recursion for one-loop gravity amplitudes. Journal of High Energy Physics, 2010(6), 27
https://doi.org/10.1007/JHEP06(2010)027, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1152
Dunbar, D., Ettle, J., & Perkins, W. (2010). Augmented Recursion For One-loop Amplitudes. Nuclear Physics B - Proceedings Supplements, 205-206-79.
https://doi.org/10.1016/j.nuclphysbps.2010.08.022, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7265
Perkins, W. & Warrick, E. (2009). Unitarity Methods For One-Loop QCD Amplitudes. Nuclear Physics B - Proceedings Supplements, 186-85.
https://doi.org/10.1016/j.nuclphysbps.2008.12.018, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7267
Perkins, W., J.H., E., & D.C., D. (2009). ``Approximate Universality of N=4 Super-Yang-Mills One-Loop Amplitudes.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7984
Dunbar, D., Perkins, W., & Warrick, E. (2009). The unitarity method using a canonical basis approach. Journal of High Energy Physics, 2009(06), 056-056.
https://doi.org/10.1088/1126-6708/2009/06/056, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1115
Bjerrum-Bohr, N., Dunbar, D., & Perkins, W. (2008). Analytic structure of three-mass triangle coefficients. Journal of High Energy Physics, 2008(04), 038-038.
https://doi.org/10.1088/1126-6708/2008/04/038, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1150
Bjerrum-Bohr, N., Dunbar, D., Ita, H., Perkins, W., & Risager, K. (2006). MHV-vertices for gravity amplitudes. Journal of High Energy Physics, 2006(01), 20 pages-009.
https://doi.org/10.1088/1126-6708/2006/01/009, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1543
Bjerrum-Bohr, N., Dunbar, D., Ita, H., Perkins, W., & Risager, K. (2006). The no-triangle hypothesis for Script N = 8 supergravity. Journal of High Energy Physics, 2006(12), 43 pages-072.
https://doi.org/10.1088/1126-6708/2006/12/072, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1544
Bidder, S., Bjerrum-Bohr, N., Dunbar, D., & Perkins, W. (2005). One-loop gluon scattering amplitudes in theories with supersymmetries. Physics Letters B, 612(1-2), 75-88.
https://doi.org/10.1016/j.physletb.2005.02.045, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1541
Bidder, S., Perkins, W., & Risager, K. (2005). One-loop NMHV amplitudes involving gluinos and scalars in Script N = 4 gauge theory. Journal of High Energy Physics, 2005(10), 17 pages-003.
https://doi.org/10.1088/1126-6708/2005/10/003, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1542

Conference Contributions

Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Analytic results for two-loop Yang-Mills. In Proceedings of Science13th International Symposium on Radiative Corrections.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa37597
https://pos.sissa.it/290/026/pdf
Perkins, W. & Bartalini, P. (2008). ``Round Table Discussion. Event generation: Are we ready for LHC?,"". In PoS ACAT08
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7983
Perkins, W. (2008). ``Unitarity methods for massless one-loop amplitudes. In PoS ACAT08
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa7985

Supervision

Unitarity and Recursion for Multi-loop Yang-Mills Amplitudes (current)

PhD

Other supervisor: Prof Adi Armoni
Analytic Techniques for Calculating Two-Loop Yang-Mills Amplitudes (awarded 2023)

PhD

Other supervisor: Prof David Dunbar
New techniques for high orders in scattering amplitudes (awarded 2022)

PhD

Other supervisor: Prof David Dunbar

Taught Modules

PH-023 Foundation Mathematics for Physicists I

Mathematics skills to complement the Foundation Year physics curriculum and prepare students for Level 1 physics.
PH-222 Electromagnetism II

This is an advanced module in electromagnetism, starting from Maxwell¿s equations and introducing classical field theory.
PMIM102 Scientific Computing and Health Care

The module aims to raise the awareness of students about scientific computing in the field of health data science. It focuses on basic software development workflows, tools, and skills that health data scientists most often employ. Students will also learn about the professional context within which health data scientists operate.

Other Roles

Director of Academic Integrity, Swansea University

2019 - 2022

Dr Warren Perkins

Telephone number

Email address

Research Links

About

Areas Of Expertise

Publications

Research Highlights

All Research

Journal Articles

Conference Contributions

Supervision

Unitarity and Recursion for Multi-loop Yang-Mills Amplitudes (current)

Analytic Techniques for Calculating Two-Loop Yang-Mills Amplitudes (awarded 2023)

New techniques for high orders in scattering amplitudes (awarded 2022)

Taught Modules

PH-023 Foundation Mathematics for Physicists I

PH-222 Electromagnetism II

PMIM102 Scientific Computing and Health Care

Other Roles

Director of Academic Integrity, Swansea University