Professor Bogdan Stefanski
Contact details
About
Overview
After completing his PhD at the University of Cambridge in 2000, Dr Bogdan Stefanski was a Post-doctoral fellow at the Max Planck Institute for Gravitational Physics in Potsdam and a FOM (Foundation for Fundamental Researchon Matter) research fellow at the Spinoza Institute in Utrecht. In 2004 he moved to Imperial College where he was a Marie Curie Intra-European Research Fellow and an EPSRC Advanced Research Fellow. Between 2008 and 2009 Bogdan Stefanski held a Marie Curie Outgoing Research Fellowship at the Massachusetts Institute of Technology and Imperial College. He joined City University in 2009 as EPSRC Advanced Research Fellow. He is Professor of Theoretical Physics and Director of Research of the Centre for Mathematical Science.
Qualifications
- PhD Mathematics, University of Cambridge, United Kingdom, 2000
- Part III Mathematics, University of Cambridge, United Kingdom, 1996
- BSc (Hons) Mathematics & Physics, University of Natal, South Africa, 1995
- BSc Majors in Mathematics, Applied Mathematics & Physics, University of Natal, South Africa, 1994
Employment
- Reader, City, University of London, United Kingdom, August 2012 - present
- Senior Lecturer, City, University of London, United Kingdom, January 2009 - August 2012
- Marie Curie Outgoing Fellow, Massachusetts Institute of Technology & Imperial College London, United States, January 2007 - December 2008
- EPRSC Advanced Fellow, Imperial College London, United Kingdom, January 2006 - December 2007
- Marie Curie Intra-European Fellow, Imperial College London, United Kingdom, January 2004 - December 2005
- Foundation for Fundamental Research on Matter Fellow, Spinoza Institute, University of Utrecht, Netherlands, September 2002 - December 2003
- Postdoctoral Research Fellow, Max Planck Institute for Gravitational Physics, Germany, September 2000 - August 2002
Memberships of professional organisations
- Member, London Mathematical Society, 2012
- Member, Institute of Physics, 2009
Research
Bogdan Stefanski is interested in all things string theory. String theory has led to a number of important developments in theoretical physics including a consistent quantisation of gravity, a natural framework for supersymmetry (a conjectured symmetry of bosons and fermions, currently being searched for at the Large Hadron Collider at CERN in Geneva) and a deaper understanding of geometric objects such as Calabi-Yau manifolds and Seiberg-Witten invariants. Despite being around the theoretical physics landscape for over 30 years, string theory is far from being fully understood - new and exciting surprizes about its properties are frequently uncovered.
One of the most impressive such surprises is the remarkable conjecture made by Juan Maldacena in 1997. In it he postulated that a strongly coupled four dimensional gauge theory (a generalised theory of nuclear interactions) was in fact described by a 10 dimensional string theory. Much of Bogdan Stefanski's recent work has focused on unravelling the stringy aspects of this correspondence: how can a 10-dimensional string theory 're-package' itself into a gauge theory?
16 Supersymmetries Workshop: A half-way meeting in the City
Publications
Publications by category
Conference papers and proceedings (4)
- Stefanski, B. and Braun, V. Orientifolds and K theory. SPIRES Conference C02/06/25.2.
- Stefanski, B. Orientifolds, discrete torsion and twisted equivariant K-theory. Workshop on the Quantum Structure of SPIRES Conference C02/09/13.
- Stefanski, B. (2001). D-branes, orientifolds and K theory. Workshop on the Quantum Structure of Spacetime and the Geometric Nature of Fundamental Interactions 13-20 September, Corfu, Greece.
- Stefanski, B. WZ couplings of D-branes and O planes. .
Journal articles (55)
- Ekhammar, S., Gromov, N., Stefański, B. and Thull, C. (2026). Short Strings in Three-Dimensional Anti–de Sitter Space: From Weak to Strong Coupling. Physical Review Letters, 136(25). doi:10.1103/3kxd-wjvs
- Sen, A. and Stefanski, B. (2026). Scattering of D0-branes and Strings. Journal of High Energy Physics, 1. doi:10.1007/jhep01(2026)033
- Ekhammar, S., Gromov, N. and Stefański, B. (2025). Demystifying the massless sector in AdS3 quantum spectral curve. Journal of High Energy Physics, 2025(10). doi:10.1007/jhep10(2025)188
- Ohlsson Sax, O., Riabchenko, D. and Stefanski, B. (2024). Worldsheet kinematics, dressing factors and odd crossing in mixed-flux AdS3 backgrounds. Journal of High Energy Physics, 2024. doi:10.1007/jhep09(2024)132
- Alexandrov, S., Fırat, A.H., Kim, M., Sen, A. and Stefański, B. (2022). D-instanton induced superpotential. Journal of High Energy Physics, 2022. doi:10.1007/jhep07(2022)090
- Cavaglià, A., Gromov, N., Stefański, B. and Torrielli, A. (2021). Quantum Spectral Curve for AdS3/CFT2: a proposal. Journal of High Energy Physics, 2021(12). doi:10.1007/jhep12(2021)048
- Alexandrov, S., Sen, A. and Stefanski, B. (2021). Euclidean D-branes in type IIB string theory on Calabi-Yau threefolds. Journal of High Energy Physics, 2021(12). doi:10.1007/jhep12(2021)044
- Alexandrov, S., Sen, A. and Stefański, B. (2021). D-instantons in Type IIA string theory on Calabi-Yau threefolds. Journal of High Energy Physics, 2021(11). doi:10.1007/jhep11(2021)018
- Majumder, S., Ohlsson Sax, O., Stefański, B. and Torrielli, A. (2021). Protected states in AdS 3 backgrounds from integrability. Journal of Physics A: Mathematical and Theoretical, 54(41), pp. 415401-415401. doi:10.1088/1751-8121/ac21e5
- Costello, K. and Stefański, B. (2020). Chern-Simons Origin of Superstring Integrability. Physical Review Letters, 125(12). doi:10.1103/physrevlett.125.121602
- Sax, O.O. and Stefański, B. (2020). On the singularities of the R–R AdS 3 × S 3 × T 4 S matrix. Journal of Physics A: Mathematical and Theoretical, 53(15), pp. 155402-155402. doi:10.1088/1751-8121/ab7c1c
- Fontanella, A., Sax, O.O., Stefański, B. and Torrielli, A. (2019). The effectiveness of relativistic invariance in AdS3. Journal of High Energy Physics, 2019(7). doi:10.1007/jhep07(2019)105
- Bombardelli, D., Stefanski, B. and Torrielli, A. (2018). The low-energy limit of AdS(3)/CFT2 and its TBA. JOURNAL OF HIGH ENERGY PHYSICS, (10). doi:10.1007/JHEP10(2018)177
- Stefanski, B. and Ohlsson Sax, O. (2018). Closed Strings and Moduli in AdS3/CFT2. Journal of High Energy Physics, 5. doi:10.1007/JHEP05(2018)101
- Baggio, M., Sax, O.O., Sfondrini, A., Stefański, B. and Torrielli, A. (2017). Protected string spectrum in AdS3/CFT2 from worldsheet integrability. Journal of High Energy Physics, 2017(4). doi:10.1007/jhep04(2017)091
- Borsato, R., Sax, O.O., Sfondrini, A., Stefański, B. and Torrielli, A. (2017). On the dressing factors, Bethe equations and Yangian symmetry of strings on AdS3×S3×T4. Journal of Physics A: Mathematical and Theoretical, 50(2), pp. 024004-024004. doi:10.1088/1751-8121/50/2/024004
- Borsato, R., Sax, O.O., Sfondrini, A. and Stefański, B. (2016). On the spectrum of AdS3×S3×T4strings with Ramond–Ramond flux. Journal of Physics A: Mathematical and Theoretical, 49(41), pp. 41LT03-41LT03. doi:10.1088/1751-8113/49/41/41lt03
- Borsato, R., Ohlsson Sax, O., Sfondrini, A. and Stefański jr, B. (2015). The AdS3× S3× S3× S1worldsheetSmatrix. Journal of Physics A: Mathematical and Theoretical, 48(41), pp. 415401-415401. doi:10.1088/1751-8113/48/41/415401
- Sax, O.O., Sfondrini, A. and Stefanski, B. (2015). Integrability and the conformal field theory of the Higgs branch. Journal of High Energy Physics, 2015(6). doi:10.1007/jhep06(2015)103
- Lloyd, T., Ohlsson Sax, O., Sfondrini, A. and Stefański, B. (2015). The complete worldsheet S matrix of superstrings on AdS3×S3×T4 with mixed three-form flux. Nuclear Physics B, 891, pp. 570-612. doi:10.1016/j.nuclphysb.2014.12.019
- Borsato, R., Sax, O.O., Sfondrini, A. and Stefanski, B. (2014). The complete AdS3 ×S3 × T4 worldsheet S matrix. Journal of High Energy Physics, 2014(10). doi:10.1007/jhep10(2014)066
- Borsato, R., Ohlsson Sax, O., Sfondrini, A. and Stefański, B. (2014). Towards the All-Loop WorldsheetSMatrix forAdS3×S3×T4. Physical Review Letters, 113(13). doi:10.1103/physrevlett.113.131601
- Lloyd, T. and Stefanski, B. (2014). AdS 3/CFT 2, finite-gap equations and massless modes. Journal of High Energy Physics, 2014(4). doi:10.1007/jhep04(2014)179
- Stefański, B. (2014). Supermembrane actions for Gaiotto-Maldacena backgrounds. Nuclear Physics B, 883(1), pp. 581-597. doi:10.1016/j.nuclphysb.2014.03.028
- Borsato, R., Ohlsson Sax, O., Sfondrini, A., Stefański, B. and Torrielli, A. (2013). Dressing phases of AdS3/CFT2. Physical Review D Particles Fields Gravitation and Cosmology, 88(6). doi:10.1103/PhysRevD.88.066004
- Sax, O.O., Stefanski, B. and Torrielli, A. (2013). On the massless modes of the AdS3/CFT2 integrable systems. Journal of High Energy Physics, 2013(3). doi:10.1007/jhep03(2013)109
- Borsato, R., Sax, O.O., Sfondrini, A., Stefanski, B. and Torrielli, A. (2013). The all-loop integrable spin-chain for strings on AdS3 × S 3 × T 4: The massive sector. Journal of High Energy Physics, 2013(8)
- Colgain, E.O. and Stefanski, B.J. (2011). A search for AdS5 X S2 IIB supergravity solutions dual to N=2 SCFTs. JOURNAL OF HIGH ENERGY PHYSICS, (10). doi:10.1007/JHEP10(2011)061
- Reid-Edwards, R.A. and Stefański, B. (2011). On Type IIA geometries dual to N=2 SCFTs. Nuclear Physics B, 849(3), pp. 549-572. doi:10.1016/j.nuclphysb.2011.04.002
- Stefanski, B. and Ohlsson Sax, O. (2011). Integrability, spin-chains and the AdS3/CFT2 correspondence. High Energy Physics, 1108, pp. 22 PP.
- Babichenko, A., Stefanski, B. and Zarembo, K. (2010). Integrability and the AdS(3)/CFT2 correspondence. J HIGH ENERGY PHYS, 1003(3), pp. 43PP.. doi:10.1007/JHEP03(2010)058
- Stefanski, B. (2009). Green-Schwarz action for Type IIA strings on AdS(4) x CP**3. Nucl.Phys., B808, pp. 80-87
- Stefanski, B. (2007). Landau-Lifshitz sigma-models, fermions and the AdS/CFT correspondence. JHEP, 0707, pp. 42 PP.
- Maiden, J., Shiu, G. and Bogdan, S.J. (2006). D-brane spectrum and K-theory constraints of D=4, N=1 orientifolds. JOURNAL OF HIGH ENERGY PHYSICS, (4)
- Stefanski, B., Maiden, J. and Shiu, G. (2006). D-brane spectrum and K-theory constraints of D=4, N=1 orientifolds. JHEP, 0604, pp. 39 PP.
- Stefanski, B. and Tseytlin, A.A. (2005). Super spin chain coherent state actions and AdS(5) x S**5 superstring. Nucl.Phys, B718, pp. 83-112
- Stefanski, B.J. and Tseytlin, A.A. (2004). Large spin limits of AdS/CFT and generalized Landau-Lifshitz equations - art. no. 042. JOURNAL OF HIGH ENERGY PHYSICS, (5)
- Stefanski, B. and Tseytlin, A.A. (2004). Large spin limits of AdS/CFT and generalized Landau-Lifshitz equations. JHEP, 0405, pp. 35 PP.
- Stefanski, B.J. (2004). Open spinning strings - art. no. 057. JOURNAL OF HIGH ENERGY PHYSICS, (3)
- Stefanski, B. (2004). Plane-wave lightcone superstring field theory. Class.Quant.Grav., 21, pp. S1305-S1311
- Stefanski, B. (2004). Open spinning strings. JHEP, 0403, pp. 23 pp.
- Stefanski, B. and Pankiewicz, A. (2003). On the uniqueness of plane wave string field theory. pp. 15 PP.
- Pankiewicz, A. (2003). An alternative formulation of light-cone string field theory on the plane wave - art. no. 047. JOURNAL OF HIGH ENERGY PHYSICS, (6)
- Stefanski, B. (2003). Open string plane wave light cone superstring field theory. pp. 19 PP.
- Stefanski, B. (2003). Orientifolds, discrete torsion and twisted equivariant K-theory. Class.Quant.Grav., 20, pp. S575-S579
- Stefanski, B. and A. Pankiewicz, A. (2003). PP wave light cone superstring field theory. Nucl.Phys., B657, pp. 79-106
- Stefanski, B. (2003). Open string plane-wave light cone superstring field theory. Nucl.Phys, B666, pp. 71-78
- Stefanski, B. (2002). D-branes, orientifolds and K-theory. Fortsch.Phys., 50, pp. 986-991
- Stefanski, B. and Quiroz, N. (2002). Dirichlet branes on orientifolds. Phys.Rev., D66, pp. 33 PP.
- Arutyunov, G., Pankiewicz, A. and Stefanski, B.J. (2001). Boundary superstring field theory annulus partition function in the presence of tachyons. JOURNAL OF HIGH ENERGY PHYSICS, (6)
- Arutyunov, G., Pankiewicz, A. and Stefanski, B. (2001). Boundary superstring field theory annulus partition function in the presence of tachyons. JHEP, 0106, pp. 31 PP.
- Stefanski, B. (2000). Dirichlet branes on a Calabi-Yau threefold orbifold. Nucl.Phys., B589, pp. 292-314
- Dasgupta, T. and Stefanski, B. (2000). NonBPS states and heterotic type I-prime duality. Nucl.Phys., B572, pp. 59-111
- Gaberdiel, M.R. and Stefanski, B. (2000). Dirichlet branes on orbifolds. Nucl.Phys., B578, pp. 58-84
- Stefanski, B. (1999). Gravitational couplings of D-branes and O-planes. Nucl.Phys., B548, pp. 275-290