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Mr David Dullaway (University of Sussex)01/09/2026, 15:30Poster
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Stijn Hennissen (Radboud University)01/09/2026, 15:31Poster
We provide a novel computational method for constructing the UV-critical surface along the lines of [arXiv:2403.08541]. Using physics informed neural networks to learn flow invariants, we recover the UV-critical surface all at once. The method is successfully applied to a UV-critical surface for an asymptotically safe scalar-tensor theory, where we predict the IR effective field theory. We...
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Edwyn Tecedor (LPTHE - Sorbonne Universitรฉ)01/09/2026, 15:32Poster
Resurgence in WardโSchwingerโDyson Equations for QED
Edwyn Tecedor (1)(3), Marc Bellon (1)(2), Redamy Perez-Ramos (1)(3)
(1) Sorbonne Universitรฉ LPTHE , CNRS (2), IPSA (3), Paris, FrancePerturbative expansions in quantum field theory are divergent, with coefficients exhibiting factorial growth. Resurgence analysis provides a systematic framework to decode this growth and extract...
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Dominik Chudy (RWTH Aachen University), Jan Herre (RWTH Aachen University)01/09/2026, 15:33Poster
We introduce a functional renormalization group framework formulated directly in the Floquet steady-state that systematically incorporates frequency-dependent interaction effects. By retaining the frequency structure of the two-particle vertex up to second order in interaction strength, our approach provides controlled access to dynamical response functions and nonequilibrium transport in...
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Fabrizio Chicconi (University of Pisa, INFN), Dr Luca Parente (University of Pisa, INFN)01/09/2026, 15:34Poster
Scale-invariant extensions of gravity, particularly quadratic gravity, offer a compelling setting due to their perturbative renormalizability and potential asymptotic freedom. Formulated in Weyl geometry, these models naturally allow physical energy scales, such as the Planck mass, to emerge dynamically through a spontaneous symmetryโbreaking mechanism, which in turn enables the recovery of an...
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Juan Fernandez Molinero (Radboud University)01/09/2026, 15:35Poster
Coupling gravity to the U(1) gauge sector induces higher-order gauge interactions that can be investigated using functional renormalization group (FRG) techniques. Within the framework of Asymptotic Safety, previous studies have shown that the existence of ultraviolet (UV) completions for these induced interactions can impose constraints, for example, on the strength of gravitational...
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Iason Vakondios01/09/2026, 15:36Poster
We investigate multicritical points in O(N) symmetric scalar field theories in various dimensions. Using functional renormalisation to leading order in a derivative expansion, we find analytical and numerical results for critical and multi-critical points. In the large-N limit, we investigate local and global fixed points, and the availability of lines of fixed points analogous to the BMB...
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Vatsalya Vaibhav (University of Edinburgh)01/09/2026, 15:37Poster
It turns out that imposing reflecting boundary conditions at the Big Bang singularity itself is sufficient to explain the CMB Power spectrum without the assumption of an exotic epoch preceding radiation era. However, there are well known problems with starting the Universe in a radiation dominated phase such as the horizon problem, overproduction of dark matter, and thermalization of...
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Mr Gabriel Weigert (Friedrich-Schiller-Universitรคt Jena)01/09/2026, 15:38Poster
In this work, we investigate aspects of resurgence in quantum electrodynamics (QED) in strong external background fields. Resurgence provides a framework for understanding how divergent perturbative series can be related to non-perturbative contributions. In particular, we study the vacuum polarization tensor and the mass operator, or electron self-energy, in a self-dual background field in...
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Moritz Gessner (Universitรคt Heidelberg)01/09/2026, 15:39Poster
Quantum gravity impacts Standard Model particles through effective interactions generated by renormalization. These appear as SMEFT operators, which correct Standard Model dynamics at energies between the electroweak symmetry breaking scale and the Planck scale. As a step to predicting SMEFT coefficients from asymptotic safety, we investigate the flow of a representative collection of...
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Jorge Ibaรฑez (Universidad de la Repรบblica (UdelaR))01/09/2026, 15:40Poster
In the critical regime of statistical-mechanical systems, thermodynamic quantities follow power laws as functions of a control parameter due to the effective interaction of the system at all scales. This universal behavior is associated with scale invariance and, in many cases, extends to conformal invariance, that is, invariance under the most general group of transformations that preserve...
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Ana Garcรญa-Page (Max-Planck-Institut for Solid State Research)01/09/2026, 15:41Poster
Chiral quantum phase transitions in Dirac materials at finite density: Strong enough interactions induce a semimetal-to-insulator transition in Dirac materials, which can be viewed as the solid-state analogue of the chiral phase transition in quantum chromodynamics. Moirรฉ Dirac materials such as twisted bilayer graphene offer a new opportunity to study this transition because they facilitate...
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Nahzaan Riyaz (University of Sussex)01/09/2026, 15:43Poster
Interacting fixed points of the renormalisation group play a central role in determining whether or not quantum field theories exhibit conformal behaviour. In this work, we investigate the conformal windows of weakly coupled fixed points in gauge-matter theories, through a systematic loop-by-loop analysis of perturbative beta functions in the large $N$ Veneziano limit. Our focus is on two...
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Carter Goldman (University of Sussex)01/09/2026, 15:44Poster
Supporters of the Bayesian Brain Hypothesis argue that the brain maintains a generative model of the environment and inverts this model to infer the states of the world. Message-passing is one class of algorithms that performs this computation tractably. While there is some evidence that the brain uses specific forms of message-passing, such as mean-field variational inference, other...
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Paul Philip Sprenger (Institute for Theoretical Physics, Heidelberg University)01/09/2026, 15:45Poster
In Quantum Gravity, the regulator breaks diffeomorphism symmetry and background independence. In this talk, we reinstate gauge invariance and background independence by a field redefinition at every renormalisation group step and discuss the properties of the resulting Reuter fixed point. Moreover, we show improved stability results for simple gravity-matter systems.
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Yaniss Rabahi (PhLam laboratory)01/09/2026, 15:46Poster
We investigate the thermodynamics of the two-dimensional Bose gas within the framework of the non-perturbative functional renormalization group (NP-FRG) and quantum phase transitions. The existence of a quantum critical point in the vacuum-superfluid transition implies that thermodynamic functions can be expressed as universal scaling functions [1]. Furthermore, using the flow equations of the...
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Lidia Marino (ITP-Heidelberg)01/09/2026, 15:47Poster
Black-hole uniqueness is expected to break in theories beyond General Relativity. This breaking can take a particularly strong form, if several branches of black-hole solutions beyond the Kerr solution coexist. We find an example of a theory that exhibits such strong breaking, where, at fixed couplings, two different scalarization mechanisms types coexist for spinning black holes. We test such...
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Rowan Packer (University of Sussex)01/09/2026, 15:48Poster
We study the interplay of scalar matter with quantum gravity in the Lorentzian signature using the recently developed spectral fRG. The spectral fRG is based on the Callan-Symanzik cutoff, which acts as a scale-dependent mass and preserves the Kรคllรฉn-Lehmann spectral representation, in combination with dimensional regularisation. In this setup, we compute the impact of N_S minimally coupled...
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Oskar Stachowiak01/09/2026, 17:00Poster
We investigate a two-component Bose mixture with repulsive intra- and interspecies interactions in two and three spatial dimensions. In three dimensions, we analyse the global structure of the phase diagram, the order of the phase transitions, and the associated universality classes using mean-field theory and the functional renormalisation group. The system exhibits four distinct phases: a...
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Max Fornoville (Max Planck Institute for Solid State Research)01/09/2026, 17:01Poster
Dipolar interactions play an important role in the critical behavior of isotropic magnets. While the microscopic physics is usually dominated by short-range exchange interactions, dipolar interactions are strongly relevant in the RG sense due to their long-range nature, leading to a crossover from O(N) universality towards the dipolar fixed point, as pointed out by Aharony and Fisher in the...
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Johannes Pรถplau01/09/2026, 17:02Poster
We investigate the Quark-Diquark Model (QDM) with the functional Renormalization Group (fRG) in the local potential approximation. In a recent work [arXiv:2510.01066 [hep-ph]], problems were reported in applying this method at low temperatures and large quark chemical potentials, which were attributed to numerical artifacts. In this work, we trace the origin of these problems to the occurrence...
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Konrad Kockler (Institut fรผr Theoretische Physik, Universitat Heidelberg)01/09/2026, 17:03Poster
We present a self-consistent, manifestly Lorentz-invariant computation of real-time quark and meson spectral functions in the two-flavour Quark-Meson model, performed directly on the Minkowski axis using the spectral functional renormalisation group with emergent composites. The present work hosts two qualitative improvements over other spectral functional works so far. The first one is the...
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Patrick Niekamp (JLU Giessen)01/09/2026, 17:04Poster
Euclidean approaches such as the functional renormalization group (FRG) have been abundantly and successfully used to study the universal static critical behavior of various physical systems near continuous phase transitions. For the study of critical dynamics, on the other hand, one usually relies on real-time methods. This work illustrates the applicability and limitations of using Euclidean...
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Carlos Pastor Marcos (Institute for Theoretical Physics (ITP), Heidelberg University)01/09/2026, 17:05Poster
Effective field theories for cosmology offer a powerful framework to investigate the dynamics of spaceโtime and address longstanding open puzzles. In this work, we initiate a programme to analyse the ultraviolet completion of vectorโtensor quantum field theories within the asymptotic safety paradigm, focusing on generalised Proca theories with a vector condensate. This enables us to assess...
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Freddie Matthew King (University of Sussex)01/09/2026, 17:06Poster
Investigation of supposedly non-renormalisable four-fermion interactions using the FRG reveals non-trivial fixed points that recover predictivity. Scale-symmetry breaking and mass generation can be seen in GrossโNeveu theory, which involves only 'scalars' (โฯbarฯ). We extend these ideas to the Nambu-Jona-Lasinio model, which includes a 'pseudo-scalar' (ฯฮณ5barฯ) such that there is an overall...
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Lovro ล aravanja (Institute for Physics)01/09/2026, 17:07Poster
We investigate the probability distribution of the order parameter in the O(N) model, with a focus on its behavior near criticality. Characterizing the full distribution provides direct insight into fluctuations and universal features of the system.
On the analytical side, we employ the Functional Renormalization Group (FRG), which enables a non-perturbative treatment of critical...
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Tim Lukas Eckert (FSU Jena)01/09/2026, 17:08Poster
We investigate spontaneous symmetry breaking in a relativistic Yukawa theory with Luttinger fermions that exhibits self-organized criticality. Within the LPA' approximation, we numerically resolve the renormalization group flow of the full effective potential. We follow the flow from the symmetric phase, characterized by a partial fixed point, into the symmetry-broken phase. Featuring an...
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Oleksandr Sulyma01/09/2026, 17:09Poster
We present an exact functional reformulation of one-particle irreducible (1PI) vertex functions in terms of derivatives of a composite-field effective action. The construction is based on an inverse Legendre transformation relating the standard 1PI effective action to an extended effective action that depends explicitly on collective fields.
Functional differentiation of this transformation...
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Gregorio Tibone (Cรดte d'Azur University, INPHYNI)01/09/2026, 17:10Poster
We study the shallow water model, which is a simplified model obtained from the Navier-Stokes equations by imposing the existence of a free surface and assuming the vertical height of the fluid to be small compared to the horizontal dimensions. This model allows to describe turbulent cascades in oceans near the coast or in highly stratified fluids. Moreover, the shallow water equations can be...
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Kanta Masuki (The University of Tokyo)01/09/2026, 17:11Poster
The renormalization group (RG) framework, which establishes a connection between a microscopic model at short distances and its coarse-grained counterpart at larger scales, has been a pivotal tool for understanding many-body phenomena across vastly different scales, ranging from elementary particles to condensed matter. Central to the RG's success is its multiscale nature, enabling systems...
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Yunxin Ye (FSU Jena)01/09/2026, 17:12Poster
We introduce a Yukawa model where a scalar boson interacts with both
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relativistic Luttinger fermions and Dirac fermions.
The Luttinger-Yukawa sector exhibits features similar to self-organized
criticality (SOC) which provides for a natural scale separation between an
initial UV scale and the scale of spontaneous symmetry breaking and mass gap
generation. We observe that the SOC... -
Alvaro Pastor Gutierrez (RIKEN iTHEMS)01/09/2026, 17:13Poster
Dynamical symmetry breaking plays a crucial role in mass and scale generation. In QCD-like theories, its dependence on the number of fermion flavours determines the phase structure and the transition to the conformal regime. In this work, we employ the functional renormalisation group and the generalised flow equation to compute non-perturbative corrections, including momentum dependencies and...
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Taichi Tanaka (Nihon University)01/09/2026, 17:14Poster
We formulate finite exact renormalization group (ERG) transformations on a multiply connected configuration space $Q$ by using the universal covering map $\pi:\widetilde Q\to Q$ and the Deck transformation group $\Gamma\cong\pi_1(Q,q_0)$. Following the broad definition used by Igarashi, Suzuki, and Sonoda, an ERG transformation is treated as a linear integral transformation acting on Boltzmann...
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Francesco Ferrarin (University of Copenhagen, Niels Bohr Institute)01/09/2026, 17:15Poster
Asymptotically safe quantum gravity has shown remarkable success when coupled to matter, notably yielding a successful postdiction of the top quark mass when the quantum gravity scale is identified with the Planck scale, a natural choice in a fundamental realization of Asymptotic Safety. This success raises the possibility that, even if not fundamental, asymptotically safe gravity may emerge...
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Justin Mauldin (Goethe University Frankfurt)01/09/2026, 17:16Poster
We investigate the QuarkโMeson Model at finite temperature and chemical potential in the presence of an external magnetic field. Emphasis is placed on the effects of (inverse) magnetic catalysis on the structure of the phase diagram. In particular, we analyze how strong magnetic fields modify the emergence and geometry of the so-called moat regime, where nontrivial dispersion relations signal...
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Rory Phipps (University of Sussex)01/09/2026, 17:17Poster
Cosmological first-order phase transitions generate a stochastic background of gravitational waves (GWs), a measurement of which would signal physics beyond the Standard Model. A crucial quantity that enters the computation of the GW power spectrum is the bubble nucleation rate, which is accessible from the underlying QFT. At small coupling, the rate can be computed in perturbation theory....
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