As of September 2018 I am heading a junior research group on "Exact Results in Extended Holography" as part of the Emmy Noether program, funded by the DFG. 

I am also a principal investigator in the graduate school Rethinking Quantum Field Theory.

Our group studies aspects of integrability in AdS/CFT, more specifically: integrable deformations of sigma models, their applications in string theory and AdS/CFT, and twist deformations in noncommutative field theory, in particular applied to 4d maximally supersymmetric Yang-Mills theory.

Group members:

• Me

• Khalil Idiab (PhD student, 2020-)

• Daniel Krogmann (MSc student, 2023-)

• Tim Meier (PhD student, 2020-)

Former members:

• Anton Pribytok (Postdoc, 2022-2023, now Postdoc at the University of Padova)

• Andrea Fontanella (Postdoc, 2019-2021, now Postdoc at Perimeter Institute)

• Yannik Zimmermann (PhD student, 2019-2023)

Please note that I am unfortunately not able to reply to requests regardings internships, PhD positions, etc., from individuals I have not met.

Publications of the group:

• S. Frolov, A. Pribytok, and A. Sfondrini, Ground state energy of twisted AdS3×S3×T4 superstring and the TBA, [arXiv:2305.17128 [hep-th]].

• T. Meier and Stijn J. van Tongeren, Gauge theory on twist-noncommutative spaces, [arXiv:2305.15470 [hep-th]].

• T. Meier and Stijn J. van Tongeren, Quadratic twist-noncommutative gauge theory, Phys.Rev.Lett. 131 (2023) 12, 121603, [arXiv:2301.08757 [hep-th]].

• K. Idiab and Stijn J. van Tongeren, Yang-Baxter deformations of the flat space string, Phys.Lett.B 835 (2022) 137499, [arXiv:2205.13050 [hep-th]].

• A. Fontanella and Stijn J. van Tongeren, Coset space actions for nonrelativistic strings, JHEP 06 (2022) 080, [arXiv:2203.07386 [hep-th]].

• S. J. van Tongeren and Y. Zimmermann, Do Drinfeld twists of AdS5 x S5 survive light-cone quantization?, SciPost Phys.Core 5 (2022) 028, [arXiv:2112.10279 [hep-th]].

• A. Fontanella and J. M. N. García, Classical string solutions in non-relativistic AdS5xS5: closed and twisted sectors, J. Phys. A 55 (2022) no.8, 085401 [arXiv:2109.13240 [hep-th]].

• F.K. Seibold, S.J. van Tongeren and Y. Zimmermann, On quantum deformations of AdS3 x S3 x T4 and mirror duality, JHEP 09 (2021) 110, [arXiv:2107.02564  [hep-th]].

• A. Fontanella, J. M. Nieto García and A. Torrielli, Light-Cone Gauge in Non-Relativistic AdS5xS5 String Theory, [arXiv:2102.00008 [hep-th]].

• F.K. Seibold, S. J. van Tongeren, and Y. Zimmermann, The twisted story of worldsheet scattering in eta-deformed AdS5 x S5,  JHEP 12 (2020) 043, [arXiv:2007.09136 [hep-th]].

• A. Fontanella and L. Romano, Lie Algebra Expansion and Integrability in Superstring Sigma-Models, JHEP 07 (2020), 083, [arXiv:2005.01736 [hep-th]].

• A. Fontanella and T. Ortín, On the supersymmetric solutions of the Heterotic Superstring effective action, JHEP 06  (2020), 106, [arXiv:1910.08496 [hep-th]].

• A. Sfondrini and S. J. van Tongeren,  TTbar deformations as TsT transformations, Phys.Rev.D 101 (2020)  066022, [arXiv:1908.09299  [hep-th]].

• S. J. van Tongeren,  Unimodular jordanian deformations of integrable superstrings, SciPost Phys. 7  (2019) 011, [arXiv:1904.08892 [hep-th]].