Trosolwg
Rwy'n defnyddio methodoleg theori maes cwantwm aflonyddol i ymchwilio i amrywiaeth o broblemau gan gynnwys deall y rhyngweithio yn Theorïau Medrydd ac wrth archwilio cysondeb aflonyddol damcaniaethau posibl Disgyrchiant Cwantwm.
Yr Athro David Dunbar
Personal Professor
Physics
501
Pumed Llawr
Adeilad Vivian
Campws Singleton
Pumed Llawr
Adeilad Vivian
Campws Singleton
Ar gael ar gyfer Goruchwyliaeth Ôl-raddedig
Dolenni Ymchwil
Cyhoeddiadau
Uchafbwyntiau Ymchwil
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Dunbar, D. (n.d.) Color Decompositions of the Two Loop Amplitudes of Yang-Mills theory. arXivSU Repository: https://cronfa.swan.ac.uk/Record/cronfa71860
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Dalgleish, A., Dunbar, D., Perkins, W., & Strong, J. (2025). The seven-point two-loop full-color all-plus helicity Yang-Mills amplitude. Journal of High Energy Physics, 2025(2), 184
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Dunbar, D. (2023). Identities amongst the two loop partial amplitudes of Yang-Mills theory. Journal of High Energy Physics, 2023(10)
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Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Diagrammar in an extended theory of gravity. Physics Letters B, 771, 230-234.
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Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1994). One-loop n-point gauge theory amplitudes, unitarity and collinear limits. Nuclear Physics B, 425(1-2), 217-260.
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Bern, Z., Dixon, L., Dunbar, D., Perelstein, M., Rozowsky, J., & Dunbar, D. (1998). On the relationship between Yang-Mills theory and gravity and its implication for ultraviolet divergences. , 530SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27371
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Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1995). Fusing gauge theory tree amplitudes into loop amplitudes. Nuclear Physics B, 435(1-2), 59-101.
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Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1997). One-loop self-dual and N = 4 super Yang-Mills. , 394SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27372
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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)
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Dunbar, D., Perkins, W., & Strong, J. (2020). n -point QCD two-loop amplitude. Physical Review D, 101(7), 076001-1-076001-10.
Holl Ymchwil
Erthyglau Cylchgronau
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Dalgleish, A., Dunbar, D., Perkins, W., & Strong, J. (2025). The seven-point two-loop full-color all-plus helicity Yang-Mills amplitude. Journal of High Energy Physics, 2025(2), 184
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Dunbar, D. (2023). Identities amongst the two loop partial amplitudes of Yang-Mills theory. Journal of High Energy Physics, 2023(10)
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Dalgleish, A., Dunbar, D., Perkins, W., & Strong, J. (2020). Full color two-loop six-gluon all-plus helicity amplitude. Physical Review D, 101(7)
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Dunbar, D., Perkins, W., & Strong, J. (2020). n -point QCD two-loop amplitude. Physical Review D, 101(7), 076001-1-076001-10.
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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)
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Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2018). Loop amplitudes in an extended gravity theory. Physics Letters B, 780, 41-47.
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Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Diagrammar in an extended theory of gravity. Physics Letters B, 771, 230-234.
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Dunbar, D., Godwin, J., Jehu, G., & Perkins, W. (2017). Analytic all-plus-helicity gluon amplitudes in QCD. Physical Review D, 96(11)
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Dunbar, D., Jehu, G., & Perkins, W. (2017). Two-loop gravity amplitudes from four dimensional unitarity. Physical Review D, 95(4)
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Dunbar, D. & Perkins, W. (2016). N=4 supergravity next-to-maximally-helicity-violating six-point one-loop amplitude. Physical Review D, 94(12)
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Dunbar, D. & Perkins, W. (2016). Two-Loop Six Gluon All-Plus Helicity Amplitude. Physical Review Letters, 117(6)
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Dunbar, D., Jehu, G., & Perkins, W. (2016). Two-loop n-point all-plus helicity amplitude. Physical Review D, 93(12)
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Dunbar, D. & Perkins, W. (2016). Two-loop five-point all-plus helicity Yang-Mills amplitude. Physical Review D, 93(8)
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Alston, S., Dunbar, D., & Perkins, W. (2015). n-point amplitudes with a single negative-helicity graviton. Physical Review D, 92(6)
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Dunbar, D., Ettle, J., & Perkins, W. (2012). Constructing gravity amplitudes from real soft and collinear factorization. Physical Review D, 86(2), 026009
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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
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Alston, S., Dunbar, D., & Perkins, W. (2012). Complex factorization and recursion for one-loop amplitudes. Physical Review D, 86(8), 085022
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Dunbar, D., Ettle, J., & Perkins, W. (2011). Perturbative expansion of N<8 Supergravity. Physical Review D, 83(6)
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Dunbar, D., Ettle, J., & Perkins, W. (2011). Obtaining one-loop gravity amplitudes using spurious singularities. Physical Review D, 84(12)
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Dunbar, D., Ettle, J., & Perkins, W. (2010). Augmented recursion for one-loop gravity amplitudes. Journal of High Energy Physics, 2010(6), 27
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Dunbar, D., Ettle, J., & Perkins, W. (2010). Augmented Recursion For One-loop Amplitudes. Nuclear Physics B - Proceedings Supplements, 205-206-79.
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Dunbar, D., Perkins, W., & Warrick, E. (2009). The unitarity method using a canonical basis approach. Journal of High Energy Physics, 2009(06), 056-056.
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Bjerrum-Bohr, N., Dunbar, D., & Perkins, W. (2008). Analytic structure of three-mass triangle coefficients. Journal of High Energy Physics, 2008(04), 038-038.
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Dunbar, D. (2008). The Six Gluon One-Loop Amplitude. Nuclear Physics B - Proceedings Supplements, 183, 122-136.
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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.
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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.
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Bjerrum-Bohr, N., Dunbar, D., Ita, H., & Dunbar, D. (2006). Exploiting Twistor Techniques for One-loop QCD Amplitudes. Nuclear Physics B - Proceedings Supplements, 160, 66-70.
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Bjerrum-Bohr, N., Dunbar, D., Ita, H., & Dunbar, D. (2006). Perturbative Gravity and Twistor Space. Nuclear Physics B - Proceedings Supplements, 160, 215-219.
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Bern, Z., Bjerrum-Bohr, N., Dunbar, D., Ita, H., & Dunbar, D. (2006). Recursive Approach to One-loop QCD Matrix Elements. Nuclear Physics B - Proceedings Supplements, 157(1), 120-124.
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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.
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Bjerrum-Bohr, N., Dunbar, D., Ita, H., & Dunbar, D. (2005). Six-point one-loop. Physics Letters B, 621(1-2), 183-194.
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Bidder, S., Dunbar, D., Perkins, W., & Dunbar, D. (2005). Supersymmetric ward identities and NMHV amplitudes involving gluinos. Journal of High Energy Physics, 2005(08), 055-055.
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Bern, Z., Bjerrum-Bohr, N., Dunbar, D., & Ita, H. (2005). Recursive calculation of one-loop QCD integral coefficients. Journal of High Energy Physics, 2005(11), 027-027.
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Bidder, S., Bjerrum-Bohr, N., Dixon, L., & Dunbar, D. (2005). supersymmetric one-loop amplitudes and the holomorphic anomaly of unitarity cuts. Physics Letters B, 606(1-2), 189-201.
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Bern, Z., Bjerrum-Bohr, N., & Dunbar, D. (2005). Inherited twistor-space structure of gravity amplitudes. Journal of High Energy Physics, 2005(05), 056-056.
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Bidder, S., Bjerrum-Bohr, N., Dunbar, D., & Perkins, W. (2005). Twistor space structure of the box coefficients of one-loop amplitudes. Physics Letters B, 608(1-2), 151-163.
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Dunbar, D., Turner, N., & Dunbar, D. (2003). Gravity and form scattering and renormalization of gravity in six and eight dimensions. Classical and Quantum Gravity, 20(11), 2293-2324.
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Dunbar, D., Turner, N., & Dunbar, D. (2002). Ultra-violet infinities and counterterms in higher-dimensional Yang–Mills. Physics Letters B, 547(3-4), 278-290.
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Dunbar, D., Julia, B., Seminara, D., Trigiante, M., & Dunbar, D. (2000). Counterterms in type-I supergravities. , 4SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27370
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Bern, Z., Dixon, L., Dunbar, D., Grant, A., Perelstein, M., Rozowsky, J., & Dunbar, D. (2000). On perturbative gravity and gauge theory. , 88SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27369
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Bern, Z., Dixon, L., Dunbar, D., Perelstein, M., Rozowsky, J., & Dunbar, D. (2000). Perturbative relations between gravity and gauge theory. Classical and Quantum Gravity, 17(5), 979-988.
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Bern, Z., Dixon, L., Dunbar, D., Perelstein, M., Rozowsky, J., & Dunbar, D. (1998). On the relationship between Yang-Mills theory and gravity and its implication for ultraviolet divergences. , 530SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27371
-
Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1997). One-loop self-dual and N = 4 super Yang-Mills. , 394SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27372
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Dunbar, D., Norridge, P., & Dunbar, D. (1997). Infinities within graviton scattering amplitudes. Classical and Quantum Gravity, 14(2), 351-365.
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Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1995). Fusing gauge theory tree amplitudes into loop amplitudes. Nuclear Physics B, 435(1-2), 59-101.
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Dunbar, D., Norridge, P., & Dunbar, D. (1995). Calculation of graviton scattering amplitudes using string-based methods. Nuclear Physics B, 433(1), 181-206.
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Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1995). Recent progress in one-loop multi-parton calculations. Nuclear Physics B - Proceedings Supplements, 39(2-3), 146-149.
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Bern, Z., Dixon, L., Dunbar, D., Kosower, D., & Dunbar, D. (1994). One-loop n-point gauge theory amplitudes, unitarity and collinear limits. Nuclear Physics B, 425(1-2), 217-260.
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Bern, Z., Dunbar, D., Shimada, T., & Dunbar, D. (1993). String-based methods in perturbative gravity. Physics Letters B, 312(3), 277-284.
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Bern, Z., Dunbar, D., & Dunbar, D. (1992). A mapping between Feynman and string motivated one-loop rules in gauge theories. Nuclear Physics B, 379(3), 562-601.
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Dunbar, D., Jack, I., Jones, D., & Dunbar, D. (1991). Consequences of superpotential renormalisation. Physics Letters B, 261(1-2), 62-64.
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Bern, Z., Dunbar, D., Guendelman, E., & Dunbar, D. (1991). Multi-instanton interactions in spontaneously broken SU (2) gauge theory. Physics Letters B, 255(3), 385-392.
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Bern, Z., Dunbar, D., & Dunbar, D. (1991). Solution of the dilaton problem in open bosonic string theories. General Relativity and Gravitation, 23(1), 107-113.
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Bailin, D., Dunbar, D., Love, A., & Dunbar, D. (1990). Bosonisation of four dimensional real fermionic string models and asymmetric orbifolds. Nuclear Physics B, 330(1), 124-150.
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Bern, Z., Dunbar, D., & Dunbar, D. (1990). Four-dimensional type I superstrings withN < 4 supergravity. Physics Letters B, 242(2), 175-184.
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Bern, Z., Dunbar, D., & Dunbar, D. (1990). Non-diagonal modular invariants and extensions of Kac-Moody algebras. Physics Letters B, 248(3-4), 317-322.
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Zvi, B., David, D., & Dunbar, D. (1990). Open superstrings in four dimensions. Physical Review Letters, 64(8), 827-830.
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Dunbar, D. & Dunbar, D. (1989). Type I superstrings in dimensions less than ten (I): Model construction. Nuclear Physics B, 319(1), 72-103.
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Bern, Z., Dunbar, D., & Dunbar, D. (1989). Type I superstrings in dimensions less than ten (II): Finiteness. Nuclear Physics B, 319(1), 104-132.
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Bailin, D., Dunbar, D., Love, A., & Dunbar, D. (1989). Yukawa couplings in four-dimensional fermionic string models. Physics Letters B, 219(1), 76-82.
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Bern, Z., Dunbar, D., & Dunbar, D. (1988). Coupling of open to closed bosonic strings in four dimensions. Physics Letters B, 203(1-2), 109-117.
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Bailin, D., Dunbar, D., Love, A., & Dunbar, D. (1988). Four-dimensional heterotic string models with rank ⩽6 observable gauge group. Physics Letters B, 212(1), 23-27.
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Dolan, B., Dunbar, D., Henriques, A., & Dunbar, D. (1988). Compactification on non-symmetric six dimensional coset spaces with torsion. Zeitschrift f�r Physik C Particles and Fields, 40(2), 259-272.
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Dunbar, D. (n.d.) Color Decompositions of the Two Loop Amplitudes of Yang-Mills theory. arXivSU Repository: https://cronfa.swan.ac.uk/Record/cronfa71860
Cyfraniadau Cynadleddau
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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
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Bjerrum-Bohr, N., Dunbar, D., Ita, H., & Dunbar, D. (2007). Similarities of gauge and gravity amplitudes.SU Repository: https://cronfa.swan.ac.uk/Record/cronfa27357
Goruchwyliaeth
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Analytic Techniques for Calculating Two-Loop Yang-Mills Amplitudes (dyfarnwyd 2023)
PhDGoruchwyliwr arall: Dr Warren Perkins -
New techniques for high orders in scattering amplitudes (dyfarnwyd 2022)
PhDGoruchwyliwr arall: Dr Warren Perkins
Modiwlau a Addysgir
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PH-232 Mathematics for Physicists III
Provides further essential mathematics for undergraduate physics at Level 2 and beyond
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PH-M41 Quantum Fields and Forces
This module introduces the fundamental concepts and techniques of quantum field theory (QFT) and their application to modern particle physics. It covers the canonical quantization of fields, the Dirac equation, gauge theories, and interactions, while also exploring contemporary particle physics topics, including neutrino oscillations, the Higgs mechanism, and open questions in the Standard Model. Students will develop a strong conceptual understanding, practical calculation skills, and the ability to critically evaluate theoretical frameworks and experimental data. The module emphasises accessible, applied QFT suitable for students new to field theory while maintaining rigor appropriate for postgraduate study.