Tension of holographic branes

• Costas Bachas

Room: Seminar room 0150, building L, ground floor

Conformal defects, holography and the bootstrap

• Valentina Forini

Room: Seminar room 0150, building L, ground floor

Radiation from conformal anomalies

• Bartomeu Fiol

Room: Seminar room 0150, building L, ground floor

The a-function in fractional dimensions

• Ian Jack

Room: Seminar room 0150, building L, ground floor

Gradient properties of the RG: from A-functions to Zamolodchikov's metrics

• Omar Zanusso

Room: Seminar room 0150, building L, ground floor On the one hand the analysis of the topological A-anomaly suggests that the renormalization group flow has a gradient structure for models with short-range interactions in even dimensions. On the other hand the requirement that the flow has a gradient structure constrains form of the beta functions. We show that these properties survive nontrivially also in other dimensions and in presence of long-range interactions. We also explicitly connect the gradient structure with the F-function and a generalization of Zamolodchikov's metric using general self-interacting scalar theories with many flavors as examples.

Heun functions from Virasoro conformal blocks

• Oleg Lisovyy

Room: Seminar room 0150, building L, ground floor

Conformal transformations and strong-gravity effects

• Sebastián Franchino-Viñas

Room: Seminar room 0150, building L, ground floor The presence of strong, background fields can induce instabilities in a quantum field theory, with important implications, for example, in the description of the early universe. Whether these background fields are electromagnetic or gravitational, understanding their effects requires the development and use of nonperturbative techniques. Recent results in this direction, employing conformal transformations of the metric, resummed effective actions and heat kernels, will be presented. Based on [arxiv.org/2602.18578][1]. [1]: http://www.arxiv.org/abs/2602.18578

Anomalous transport from effective field theory

• Rémy Larue

Room: Seminar room 0150, building L, ground floor

Derivation of the Path Integral for Quantum Mechanics on SU(2)

• Mathieu Beauvillain

Room: Seminar room 0150, building L, ground floor

QCD trace anomaly in a nucleon and dense matter

• Kenji Fukushima

Room: Seminar room 0150, building L, ground floor

Anomalous transport in anomaly free currents from symmetry breaking

• Karl Landsteiner (Universidad Autónoma de Madrid, Spain)

Room: Seminar room 0150, building L, ground floor

Axial and mixed axial-gravitational anomalies in rotating systems

• Matteo Buzzegoli

Room: Seminar room 0150, building L, ground floor

Euclidean methods for Lorentzian de Sitter space

• Dionysios Anninos

Room: Seminar room 0150, building L, ground floor

Semi-classical black holes: recent advances and future prospects

• Antonia Frassino

Room: Seminar room 0150, building L, ground floor

On bulk reconstruction in Lorentzian AdS and its flat space limit

• Ana-Maria Raclariu

Room: Seminar room 0150, building L, ground floor We revisit the reconstruction of a free scalar in 4-dimensional Lorentzian Anti-de-Sitter spacetime in terms of primary operators in the boundary 3d CFT. We show that the positive and negative energy subspaces of solutions to the Klein–Gordon equation in AdS can be spanned with bulk-to-boundary propagators with appropriate time orderings. As a result, free scalar fields on a codimension-1 bulk hypersurface can be expressed in terms of operators integrated over boundary regions in the past or future of the hypersurface with kernels given by time-ordered or anti-time-ordered propagators. We will explain how to obtain a similar decomposition of the free field in terms of boundary operators transforming in representations of an so(3,1) subalgebra of the 4d AdS isometry algebra by constructing the appropriate wavefunctions. We conclude by showing that the expansion of a free scalar in Minkowski space in plane wave, Carrollian and conformal primary bases follow from these results in various flat space limits.

Gravitational Creation of Conformal Fields from Cosmological Perturbations

• Azadeh Maleknejad

Room: Seminar room 0150, building L, ground floor

Computational Quantum Field Theory: Extension to curved spacetimes

• Mohammed Alkhateeb

Room: Seminar room 0150, building L, ground floor We introduce the computational quantum field theory (CQFT) framework for calculating the time-resolved number densities of particle--antiparticle pairs produced by external electromagnetic backgrounds (Schwinger effect). We then extend this framework to curved two-dimensional spacetimes, where the local conformal flatness of the metric enables a simplified treatment of the fermionic dynamics ensuring unitary time evolution with respect to the flat inner product. Finally, we present results for fermion--antifermion pair production induced by spacetime curvature.

Matching A with F in long-range QFTs

• Lorenzo Benfatto

Room: Seminar room 0150, building L, ground floor

Hydrodynamics of dilation and spin currents

• Zhong-Hua Zhang

Room: Seminar room 0150, building L, ground floor

Operator product expansion in conformal field theories on curved spaces

• Anatoly Konechny

Room: Seminar room 0150, building L, ground floor

Quantum information geometry of driven CFTs

• Esko Keski-Vakkuri

Room: Seminar room 0150, building L, ground floor There has been a growing body of work on driven CFTs. One can deform the Hamiltonian by applying e.g. a spatial deformation. This mimicks a deformed spin chain with non-uniform couplings, with a strength profile following some envelope function. One can then apply Floquet driving by alternating between the deformed and undeformed Hamiltonian, and study what happens to the system during the time evolution. In this way one can find different phases, such as in one phase the system absorbs work and heats up, in another the work is returned and then absorbed again and on and on. There has also been much work on circuit complexity of CFTs. There the time evolution is viewed as a continuous circuit of unitary operators, and notions of circuit complexity of quantum algorithms can be implemented with a suitable cost function. The cost function can e.g. be based on a quantum information geometry. My talk combines these two topics: I will investigate the so-called Bogoliubov-Kubo-Mori quantum information metric applied to driven CFTs, and relate driving to a background spacetime metric. This provides new connections between quantum information geometry, CFTs, holography, and non-equilibrium physics.

Conformal anomalies in Carrollian theories

• Dmitri Vassilevich

Room: Seminar room 0150, building L, ground floor

Gibbons-Hawking-York term for metric affine gravity

• Ioannis Matthaiakakis

Room: Seminar room 0150, building L, ground floor

Quantum systems under imaginary rotation

• Victor E. Ambruș (West University of Timișoara)

Room: Seminar room 0150, building L, ground floor