Seminars

The Seminars start at 1:45pm. They are held alternately at:

  • TU Wien (TU): Getreidemarkt 9, Maschinenbaugebäude, 1st floor, Hörsaal Kleiner Schiffbau
  • University of Vienna (UV): Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall

 A list of all upcoming seminars can be found here.

Upcoming Seminars:

09-04-2019, 1:45pm at the TU: Marco Bochicchio (INFN Roma) will talk on „Renormalization in large-N QCD and open/closed string duality“

Abstract: We demonstrate that the asymptotic freedom and renormalization group imply that the large-N ’t Hooft expansion of the YM S-matrix is ultraviolet (UV) finite nonperturbatively, while the large-N expansion of the QCD S-matrix is only renormalizable, due to UV divergences starting from the or der of N_f/N, with N_f the number of quark flavors. We investigate the compatibility of the aforementioned renormalization properties with the existence of a supposed canonical string solution, matching the topology of ’t Hooft large-N expansion, for the S-matrix of large-N YM theory and QCD. The UV finiteness of the large-N YM S-matrix is compatible with the universally believed UV finiteness of closed string theories. Yet, we demonstrate that the aforementioned renormalization properties of the large-N QCD S-matrix to the order of N_f/N are incompatible with the open/closed string duality of the would-be canonical string solution, which therefore does not exist. We suggest a noncanonical way-out based on topological string on noncommutative twistor space.

Past Seminars (since 2016):

  • Lisa Glaser (UV) on„Spectral dimension and other geometry estimators in random fuzzy spaces“ (02-04-2019)
  • Pulastya Parekh (Indian Institute of Technology Kanpur, India) on „Tensionless strings : A perspective from the worldsheet“ (30-01-2019)
  • Emanuel Malek Max Planck Institute for Gravitational Physics, Potsdam on „ Exceptional geometry of supersymmetric AdS vacua“ (23-01-2019)
  • Philipp Stanzer (TU Wien) will talk on „Quantum Null Energy Condition – Analytic, Perturbative and Numerical Results“ (15-01-2019)
  • Georg Stettinger University of Groningen, Netherlands on „Infinite derivative gravity in 2+1 spacetime dimensions“ (08-01-2019)
  • Marco Bertolini (Kavli IPMU  ‐ The University of Tokyo) on 'A (0,2) mirror duality' (18-12-2018)
  • Peter Schupp (Jacobs University Bremen) on `Gravity as graded spacetime (quantum) mechanics' (11-12-2018)
  • Stefan Groot Nibbelink (Rotterdam University of Applied Sciences) on `Tension Between a Vanishing Cosmological Constant and Non-Supersymmetric Heterotic Orbifolds' (30-11-2018)
  • Abhiram Kidambi (TU Vienna) on „Number theoretic aspects of black hole entropy in 4d string compactification“ (04-12-2018)
  • Christian Northe (Uni Würzburg) on „Boundary RG flows, Kondo and AdS/CFT“ (27-11-2018)
  • Céline Zwikel (TU Wien) on „Asymptotic symmetries of three-dimensional black strings“ (20-11-2018)
  • Wolfgang Wieland (Perimeter Institute for Theoretical Physics, Waterloo, Canada) on „Loop Quantum Gravity and the Continuum“ (13-11-2018)
  • Niccolò Cribiori (TU Wien) on `Linear versus Non-linear Supersymmetry' (06-11-2018)
  • Max Riegler (Université Libre de Bruxelles, Bruxelles, Belgium) on `Warped Black Holes in Lower-Spin Gravity' (30-10-2018)
  • Maulik Parikh (Arizona State University, Tempe, Arizona) on `The Three Laws of Future Light Cone Thermodynamics' (23-10-2018)
  • Glenn Barnich (Université Libre de Bruxelles) on `Electromagnetic edge modes and black hole entropy' (16-10-2018)
  • Avik Banerjee (Saha Institut of Nuclear Physics, India) on `Strings, Branes, Schwarzian action and Maximal Chaos' (09-10-2018)
  • Karapet Mkrtchyan (Max-Planck-Institut, Potsdam) on `Interactions of massless bosons in three dimensions' (02-10-2018)
  • Zoltan Bajnok (Wigner Research Centre, Budapest) will talk on `Integrable aspects of the AdS/CFT duality' (25-09-2018)
  • Thorsten Schimannek (Univ.  Bonn) on `Fourfolds, integral Fluxes and Modularity' (26-06-2018)
  • Prof. Martin Schnabl (Univ. Prag) on `Topological defects in open string field theory' (19-06-2018)
  • Prof. T. R. Govindarajan (Chennai, Indien) on `Should photon mass be zero?' (12-06-2018)
  • Peter Presnajder (Comenius University Bratislava) on `Quantum systems in relativistic fuzzy spaces' (05-06-2018)
  • Amihay Hanany (Imperial College London) on `Discrete Gauging and Small E8 instantons in six dimensions' (29-05-2018)
  • Gabriele Tartaglino-Mazzucchelli (KULeuven) on `Curvature squared invariants in 6D N=(1,0) supergravity' (08-05-2018)
  • Marcus Sperling (University of Vienna) on `Intersecting branes, Higgs sector, and chirality from N=4 SYM with soft SUSY breaking' (24-04-2018)
  • Linus Wulff (Masaryk University, Brno) on `Generalized supergravity and non-abelian T-duality anomaly' (17-04-2018)
  • Pascal Anastasopoulos (University of Vienna) on `Yukawas of light stringy states' (13-03-2018)
  • Peter Allmer (Vienna) on „Fusion of defects in Landau - Ginzburg models in a functorial approach“(23-01-2018)
  • Yihao Yin (Universidad Andres Bello, Santiago de Chile) on 'Vasiliev's equations, (A)dS backgrounds and perturbations' (12-01-2018)
  • Philip Hacker (TU Wien) on „Soft hairy warped black hole entropy“ (12-12-2017)
  • Nikola Gushterov (Oxford U.) on `Holographic Entanglement Density' (05-12-2017)
  • Daniel Fernandez (Iceland U.) on `Entanglement entropy at non-equilibrium in holography' (28-11-2017)
  • Athanasios Chatzistavrakidis (Rudjer-Boskovic-Institute Zagreb) on `Double Field Theory and Membrane Sigma Models' (21-11-2017)
  • Abhiram M. Kidambi (TU Wien) on `Calabi-Yau manifolds and sporadic groups' (14-11-2017)
  • Harold Steinacker (Uni Wien) on 'Quantized cosmological space-times from Yang-Mills matrix models' (07-11-2017)
  • Cedric Troessaert (MPI für Gravitationsphysik, Potsdam) on 'BMS4 at spatial infinity' (24-10-2017)
  • Shailesh Lal (Paris, LPTHE) on 'Quantum Effects in Higher Spin Holography and Tensionless AdS Strings' (17-10-2017)
  • Andrea Campoleoni (ETH Zürich) on 'Higher-spin BMS symmetries in four dimensions and soft theorems' (16-10-2017)
  • Harald Grosse (Uni Wien) on 'Quantum field theory models on noncommutative spaces' (12-10-2017)
  • Olaf Krüger (Uni Wien) on 'The Embedding of gauged N = 8 supergravity into 11 dimensions' (10-10-2017)
  • Jnanadeva Maharana (Institute of Physics, Bhubaneswar) on 'High energy behavior of scattering cross sections' (03-10-2017)
  • Christoph Roupec (Uni Wien) on 'Inflation in Supergravity' (27-06-2017)
  • Andjelo Samsarov (Ruder Boskovic Institute, Zagreb) on 'Black hole quasinormal modes in twisted models of matter minimally coupled to gravity' (30-05-2017)
  • Yang-Hui He on 'Calabi-Yau Volumes and Reflexive Polytopes' (23-05-2017)
  • Anton Alekseev (University of Geneva) on 'Path integrals for Wilson lines and Wilson surfaces' (16-05-2017)
  • Tristan McLoughlin (Trinity College Dublin) on 'Twistors and Conformal Higher-Spin Theory' (09-05-2017)
  • Stefano Cremonesi (Durham University) on 'The infrared physics of bad theories' (24-04-2017)
  • Harold Steinacker (Uni Wien) on `Covariant Quantum Spaces, the IKKT-model & Gravity' (04-04-2017)
  • Eric Bergshoeff (University of Groningen) on `Applied Newton-Cartan Geometry' (21-03-2017)
  • Volker Branding (Uni Wien) on `The full bosonic string as a geometric variational problem' (14-03-2017)
  • Rutger Boels (DESY, Hamburg) on `Minimal Quantum Field Theory' (31-01-2017)
  • Johanna Knapp (TUWien) on `Calabi-Yau compactifications and supersymmetric gauge theory' (24-01-2017)
  • Pan Kessel (MPI für Gravitationsphysik, Potsdam) on `Four-dimensional Vasiliev Theory : An Introduction' (17-01-2017)
  • Marcus Sperling (University of Vienna) on `Properties of the monopole formula' (10-01-2017)
  • Joris Raeymaekers (Prague) on `Multi-centered AdS3 solutions from Virasoro conformal blocks' (19-12-2016)
  • Yuhma Asano (DIAS, Dublin) on `Emergent geometries in the BMN matrix model' (13-12-2016)
  • Maja Buric (Belgrade University) on `Noncommutative spaces and differential geometry' (22-11-2016)
  • Miguel Tierz (Lisbon University) on `Matrix models and phase transitions in supersymmetric gauge theories in three dimensions' (15-11-2016)
  • Raimar Wulkenhaar (Münster) on `Exact solution of quantum field theory toy models' (08-11-2016)
  • Enrice Brehm (LMU, München) on `Classical Holographic Codes' (25-10-2016)
  • Andrea Campoleoni (ULB, Brussels) on `Higher spin theories from a Hamiltonian viewpoint' (18-10-2016)
  • Iva Lovrekovic (TUWien) on `Conformal gravity in four dimensions' (11-10-2016)