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Paweล Jakubczyk (Institute of Theoretical Physics, Faculty of Physics, University of Warsaw)01/09/2026, 13:40Talk
We readdress quantum criticality of itinerant Fermi systems in dimensionality d=2 adopting the Wetterich equation as the starting point. Upon neglecting Fermi self-energy in the loop integrals of the functional RG flow, we identify a non-Fermi liquid RG fixed point and recover the features of earlier RPA-type approaches in the entire frequency range. In a subsequent step, focusing on the...
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Charlie Cresswell-Hogg01/09/2026, 13:40Talk
Four-fermion interactions are important in many areas of particle physics, from effective descriptions of weak interactions and QCD to parametrisations of new physics in SMEFT or HEFT. In this talk I demonstrate that four-fermion interactions may develop strongly coupled UV fixed points in four dimensional QFTs. Contrary to weakly coupled expectations, their high energy limit may be (near-)...
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Yuepeng Guan (Jilin University)01/09/2026, 13:40Talk
We study topological properties of a quantum mechanical system with $U(1)$-symmetry within the functional renormalisation group (fRG) approach. These properties include the vacuum energy structure and the topological susceptibility. Our approach works with a complexification of the flow equation, and specifically we embed the original symmetry into the complex plane, $U(1)\rightarrow...
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Francesco Del Porro (Niels Bohr Institute)01/09/2026, 14:00Talk
The existence of an ultraviolet (UV) fixed point in the renormalization group (RG) flow of gravity provides a non-perturbative route to renormalizing gravity, that is Asymptotically Safe Quantum Gravity. Evidence for such a UV completion has been found in a variety of settings, including higher-derivative gravity theories and gravityโmatter systems. However, despite its apparent robustness, it...
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Gonzalo De Polsi01/09/2026, 14:00Talk
The derivative expansion is a central approximation scheme within the functional renormalization group, yet its convergence is often hindered by a strong dependence on the choice of regulator.
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In this talk, we argue that this limitation originates from the incomplete realization of conformal symmetry at criticality within standard projection procedures. To address this issue, we construct a... -
Mireia Tolosa-Simeรณn01/09/2026, 14:00Talk
Interaction-induced quantum phase transitions in Dirac materials, known as relativistic Mott transitions, involve spontaneous symmetry breaking and are accompanied by a non-vanishing expectation value of a scalar order parameter. For the first time, such transitions have recently been observed experimentally in moirรฉ Dirac materials through the tuning of the twist angle. In this contribution,...
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Vincent Grison (Sorbonne Universitรฉ)01/09/2026, 14:20Talk
One-dimensional interacting bosons subjected to disorder are known to possess an insulating ground state, called the Bose glass. At finite temperature, perturbative computations advocate for a crossover to a non-disordered normal fluid, but an alternative scenario was also suggested, arguing for the existence of a genuine phase transition. The resulting low-temperature insulating phase is then...
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Max Uetrecht (TU Dortmund University)01/09/2026, 14:20Talk
Recently, the familiar $S$ matrix form $S=1+iT$ and crossing rules were challenged in Chern--Simons theories coupled to bosonic or fermionic matter. In the planar large-$N$ singlet channel, the proposed modifications restore unitarity by changing both the forward identity contribution and the crossing relation obeyed by the $T$ matrix. In this talk, we present a direct perturbative calculation...
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Anca Preda (Lund University)01/09/2026, 14:20Talk
The idea of supplementing the number of spacetime dimensions has long been deemed as one of the potential extension of the Standard Model, as it provides powerful tools to explain some of its shortcomings. One example of higher-dimensional formulations are asymptotic grand unified theories (aGUTs), for which the couplings do not meet at a high scale, but instead flow together towards a fixed...
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Ivan Balog (Institute of Physics, Zagreb)01/09/2026, 14:40Talk
We study disorder-dominated quantum models, including Ising-like random-field systems and equilibrium pinned elastic-manifold problems, near their zero-temperature critical regimes. We provide an explicit field-theoretic calculation supporting the fluctuationless fixed point scenario, in which the infrared critical fixed point is classical and quantum fluctuations enter through a dangerously...
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Fรฉlix Rose (LPTM, CY Cergy Paris Universitรฉ)01/09/2026, 14:40Talk
In a quantum field theory, the product of two operators in the short distance limit can be expressed as a sum of operators multiplied by functions (when inserted in any correlation function).
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This so-called operator product expansion (OPE) is of fundamental importance in the study of conformal field theories (CFTs) in two and higher dimensions. There, due to the the conformal symmetry, the... -
Andreas Trautner (CFTP, IST, University of Lisbon)01/09/2026, 14:40Talk
I will show how the existence of an outer automorphism (Out) provides a sufficient condition for the existence of an RG fixed hyperplane (fixed point, separatrix) in the renormalization group (RG) flow of a Quantum Field Theory (QFT). This gives a systematic way to derive non-perturbative all-order constraints on the RG beta functions and provides the mathematical underpinning of 't Hooft's...
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Johanna Borissova (Imperial College London)02/09/2026, 14:00Talk
$2$-dimensional dilaton theories play a central role in discussions of black holes in a variety of approaches to classical and quantum gravity. In this talk I will present a unified framework for black hole thermodynamics of $d$-dimensional static black holes with spherical, toroidal or compact hyperbolic horizon topology satisfying $g_{tt}g_{rr}=-1$ in Schwarzschild gauge by considering the...
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Takato Mori (Rikkyo University)02/09/2026, 14:00Talk
Renormalization group (RG) flow has been discussed widely from high energy physics to statistical mechanics. However, the connection between many-body RG and continuum RG such as Wilsonian RG and functional/exact RG is not always clear. Moreover, once we consider a finite system, the RG process becomes approximate although several independent proposals have exist in the condensed matter...
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Alvaro Pastor Gutierrez (RIKEN iTHEMS)02/09/2026, 14:00Talk
Precondensation is a peculiar phenomenon in phase transitions, characterised by the occurrence of a condensate only over a finite range of length scales. It is closely connected to the emergence of domains, pseudo-gapped phases and spatial inhomogeneities in equilibrium. In this talk, I will discuss its occurrence in gauge-fermion theories in the chiral limit, close to the thermal chiral phase...
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Nikolaos Tetradis (National and Kapodistrian University of Athens (GR))02/09/2026, 14:20Talk
I discuss the entanglement entropy for a free scalar field within a spherical region in various gravitational backgrounds (flat, de Sitter and anti-de Sitter space, the Einstein universe). In the first part I focus on the structure of the divergences. Universal coefficients are determined for ultraviolet and infrared divergent terms. In the second part I discuss the use of the finite part of...
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Gian Paolo Vacca (INFN - Bologna section)02/09/2026, 14:20Talk
Adopting the principles of minimal sensitivity we analyze, using the Wetterich Morris RG flow equations for various truncation schemes, the critical exponents of the 3-dimensional Ising universality class.
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Katsumi Itoh (Niigata University)02/09/2026, 14:20Talk
We consider quantum electrodynamics with chiral four-Fermi interactions in the functional renormalization group approach. In gauge theories, the functional flow equationย for the effective action is accompanied by the quantum master equationย that governs the underlying gauge symmetry. Beyond perturbation theory, fully gauge-consistent solutions are very difficult to obtain. By including the...
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Lucien Heurtier (King's College London)02/09/2026, 14:40Talk
In this talk, I will present a non-perturbative framework that allows to track the dynamics of slow-roll inflation while consistently incorporating quantum corrections, based on an alternative functional renormalisation group (RG) approach. I will guide you through the derivation of a set of coupled Friedmann-RG flow equations governing the joint evolution of spacetime, the inflaton field, and...
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Adam Ranรงon (Universitรฉ de Lille)02/09/2026, 14:40Talk
The Ising model at criticality is a paradigmatic example of random variables displaying strong correlations at all scales. In the high and low temperature phases, the collective properties of the system are described by the standard (Gaussian) central limit theorem. In contrast, at the critical point separating the two phases, the fluctuations are non-Gaussian and are captured by a...
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Hao-Lin Li (Sun Yat-Sen University)02/09/2026, 14:40Talk
The infrared structure of gauge theories with chiral fermions remains largely unexplored. In this work we investigate the Bars-Yankielowicz class using the functional renormalisation group, building on recent developments in gauge-fermion systems that provide clear criteria for confinement and dynamical symmetry breaking. We show that two distinct phases arise: one exhibiting both confinement...
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Ugo Mire02/09/2026, 15:00Talk
Diquarks, correlated quark-quark pairs carrying net color charge, play a key role in both baryon structure and dense quark matter. In this talk I will present results for the vacuum properties of the scalar diquark in a self-consistent and first-principles approach to QCD. Using the functional renormalization group, in particular dynamical hadronization, I will show how the high energy quark...
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Prof. Sarben Sarkar (King's College London)02/09/2026, 15:00Talk
The conjecture by two of the authors (N.E.M. and S.S.) that a \cPT-symmetric phase plays a role in understanding singular renormalisation group (RG) flows for a Chern-Simons (CS) gauge theory of axions, has been reexamined and significantly improved.
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We have used the more complete Wetterich equation, which includes gravitational couplings in a systematic way from the start, to... -
Mr Nicolas Paris (LPTMC Sorbonne Universitรฉ)02/09/2026, 15:00Talk
Quantum impurity models are key platforms for studying strong electronic correlations and can be realized with high precision in quantum-dot experiments. While the low-transparency (weak-coupling) regime is well understoodโparticularly using the Numerical Renormalization Groupโthe opposite limit of highly transparent contacts has remained largely unexplored.
In this talk, I show how the...
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Eric Oevermann (Friedrich Schiller University Jena)02/09/2026, 15:20Talk
We study QCD in 1+1 dimensions focusing on meson formation in the vacuum. Utilizing a mass-like Callan-Symanzik regulator, we investigate the flow of the four-quark vertex in a Fierz complete basis. The couplings diverge in the point-like limit, signaling bound state formation. We progress with resolving some momentum dependencies by invoking a Hubbard-Stratonovich transformation. For heavy...
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Fabian Wagner (Heidelberg University)02/09/2026, 15:20Talk
Scalar-tensor theories are ubiquitous in cosmology. Asymptotic safety offers a guiding principle to significantly shrink the available theory space. At the same time, cosmological observables provide a stringent test of the asymptotic-safety paradigm. Focusing on Horndeski models of dark energy, I show how simple models fail to meet both observational constraints and constraints from...
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Ashutosh Dash02/09/2026, 15:20Talk
The functional renormalization group (FRG) recasts the flow of the effective action as an initial-value problem in RG "time," which for O(N)-type models can be written as a nonlinear fluid-dynamic conservation law for the field-space derivative of the potential. Physical observables - the IR vertex functions $\Gamma^{(2n)} = \partial_\sigma^{2n-1}u|_{\sigma=0}$ - are highly localized...
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Astrid Eichhorn03/09/2026, 09:00Talk
I will review developments on the asymptotically safe Standard Model, in which an ultraviolet completion of the Standard Model with gravity may give rise to emergent structures in the Standard-Model couplings, which compare well with observed structures.
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Prof. Wei-jie Fu (Dalian University of Technology)03/09/2026, 09:00Talk
The density functional renormalization group (density-fRG) is proposed to investigate the density fluctuations within the functional renormalization group approach, which allows us to quantify the medium effect and study physics of high densities. This method is applied to the nucleon-meson effective field theory, also known as the Walecka model, to study the properties of nuclear matter at...
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Alessandro Codello (Ca' Foscari)03/09/2026, 09:00Talk
We show that it is possible to use dimensional regularization (DR) beyond the usual $\varepsilon$-expansion in the context of renormalization group (RG) calculations in Critical Phenomena.
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Based on this fact, we propose a new functional RG scheme - Functional Dimensional Regularization (FDR) - and apply it to a scalar theory in three dimensions.
We compute the critical exponents of the... -
Prof. Brian Dolan (Dublin Institute for Advanced Studies)03/09/2026, 09:20Talk
The RG flow of the CKM matrix in the Standard model will be presented and the fixed points found. There are six fixed points, associated with the elements of the symmetric group of three objects, $S_3$. A proof is given that these are fixed points to all orders in perturbation theory and even non-perturbatively. The analysis is equally applicable to the PMNS matrix in the leptonic sector,...
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Piero Beretta (Facultad de Ingenierรญa. Universidad de la Repรบblica)03/09/2026, 09:20Talk
The novel functional dimensional regularization (FDR) scheme has proven capable of yielding results that are competitive with the state-of-the-art in the computation of critical exponents in $d=3$, while also reproducing those from the $\varepsilon$-expansion for the Ising and other universality classes. In this work, we show that this is not a mere coincidence: by applying the scheme to the...
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Franz Richard Sattler (University Bielefeld)03/09/2026, 09:20Talk
QCD at large densities exhibits a moat regime in the scalar-pseudoscalar sector. The resolution of its dynamics is pivotal to access the onset of new phases, including the potential critical endpoint of QCD.
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I report on a first self-consistent analysis of this regime, using the first-principles functional renormalisation group approach to QCD.
Mapping out the moat regime, we find a potential... -
Zois Gyftopoulos (Heidelberg University)03/09/2026, 09:40Talk
Neutrinos oscillate with large mixing angles. Dirac neutrino masses are small
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compared to the other Standard Model fermions and a near-degenerate mass spectrum
is compatible with experimental data on neutrino masses. However, large mixing is not
radiatively stable in the near-degenerate case. Here, we find that the Standard Model lies
close to a transition between a phase with large and a... -
Tom Steudtner03/09/2026, 09:40Talk
I will report about recent progress to systematise the search for non-trivial fixed points in three dimensions. I revisit the stability of the UV fixed point in purely scalar theories using perturbation theory. I will discuss how the results are compatible with FRG, and address an old controversy in the literature. Furthermore, scalar-fermionic theories are investigated up to four-loop order,...
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Chuang Huang (Heidelberg University, ITP)03/09/2026, 09:40Talk
We present the first functional QCD calculation of the pion distribution amplitude (DA) using the large-momentum effective theory in the functional renormalization group (fRG) framework. With only the strong coupling and current quark masses as input, we compute the quasi-DA from first-principles QCD correlation functions. By pushing the pion momentum up to $P_z = 4.5\ \mathrm{GeV}$, the...
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Bernd-Jochen Schaefer03/09/2026, 10:00Talk
Astrophysical observations of massive neutron stars and compact-object mergers increasingly point toward the presence of deconfined quark matter at high densities. In such environments, quarks are expected to form color-superconducting diquark pairs. Their properties are typically modeled within effective theories, where parameter fixing remains challenging due to the absence of diquarks as...
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Dr Shunsuke Yabunaka (ASRC, JAEA)03/09/2026, 10:00Talk
Renormalization group (RG) fixed points are commonly associated with scale invariance and a divergent correlation length. We show that this connection can fail in the tricritical O(N) model in three dimensions in the limit Nโโ. Revisiting the line of fixed points identified by Bardeen, Moshe, and Bander, we use the functional renormalization group to clarify the mechanism leading to mass...
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Daniele Rizzo (KBFI-Tallinn)03/09/2026, 10:00Talk
We derive quantum gravity contributions to the beta functions of the gauge and Yukawa couplings of a matter theory using the Schwinger proper-time flow equation. Working in the Einstein-Hilbert truncation, we investigate the gauge-fixing and regulator dependence of the corresponding renormalization group equations. We quantify the sensitivity of our results on unphysical parameters by...
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Fanny Eustachon (รcole polytechnique)03/09/2026, 11:00Talk
The multicritical generalizations of the Lee-Yang universality class arise as RG fixed points of scalar field theories with complex $i\phi^{2n+1}$ interaction, just below their upper critical dimension. It has been recently conjectured that their continuation to two dimensions corresponds to the non-unitary conformal minimal models M(2,2n+3). Motivated by that, I will revisit the functional...
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Gabriel Assant03/09/2026, 11:00Talk
Using modern functional renormalisation adapted for theories in Lorentzian signature, and enhanced by new symmetry conditions to account for underlying Ward identities, we derive and solve flow equations directly for the Kรคllรฉn-Lehmann representation of propagators. Consistent results are found for several sets of renormalisation conditions yielding normalisable spectral functions for the...
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Sankarshan Sahu (LPTMC, Sorbonne Universitรฉ)03/09/2026, 11:00Talk
The Central Limit Theorem does not hold for strongly correlated stochastic variables, as is the case for statistical systems close to criticality. Recently for the three-dimensional Ising model, the calculation of the probability distribution function (PDF) of the total spin: $P(L^{-d}\int d^{d}x~\phi(x)=s)$ at criticality has been performed with the functional renormalization group. It has...
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Bilal Hawashin03/09/2026, 11:20Talk
It was recently established that spontaneous symmetry breaking (SSB) can persist at all temperatures in certain quantum field theories (QFTs) that involve two scalar fields. This construction is based on the existence of a suitable fixed point, promoting the QFT to a conformal field theory (CFT) and thereby ensuring that the theory is well-defined in the high-temperature limit. In my...
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Ms Semanti Dutta (S.N. Bose National Center for Basic Sciences)03/09/2026, 11:20Talk
There is a method for constructing from first principles, a holographic bulk dual action in Euclidean $AdS_{d+1}$ space for a $d$-dimensional Euclidean CFT on the boundary, starting from the Polchinski's Exact RG (ERG) equation that describes the RG evolution of the interaction part of the boundary Wilson action. The bulk action in $AdS_{d+1}$ has an $SO(1,d+1)$ symmetry and is obtained from...
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Angelo Portas Chiesa (University of Sussex)03/09/2026, 11:20Talk
Asymptotically safe quantum gravity provides a UV completion of metric quantum gravity, with and without matter. This is achieved via scale invariance in the strongly coupled regime, entailing finiteness at all scales. Compared to the existence of the scaling symmetry, the study of the unitarity of the theory is still in its infancy. In this talk, I present the asymptotically safe scattering...
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Nicolรกs Wschebor (Instituto de Fรญsica de la Facultad de Ingenierรญa, Udelar (Uruguay))03/09/2026, 11:40Talk
We will present the โDerivative Expansionโ as applied to the study of scalar models with $O(N)\times O(2)$ symmetry. These models describe Stacked Triangular Antiferromagnets, which have been the subject of a long-standing controversy regarding the order of the phase transition for the experimentally studied cases $N=2$ and $N=3$ in $d=3$. A brief review will be given of previous studies of...
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Alfiia Mukhaeva (Joint Institute for Nuclear Research)03/09/2026, 11:40Talk
From the locality condition of quantum field theory and the Bogoliubov-Parasiuk-Hepp-Zimmerman procedure, we will derive universal expressions that allow summation of complete series of singularities and logarithms in quantum field theory. To demonstrate, we will apply this approach to an effective theory with arbitrary scalar potential, where we sum the leading and subleading logarithmic corrections.
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Diego Buccio (Heidelberg University)03/09/2026, 11:40Talk
In higher derivative (HD) theories, a new kind of infrared divergences emerges from loop integrals. While in ordinary 2-derivative theories in d=4 IR divergencies are associated with the emission of soft or collinear particles by almost on-shell external legs, in HD theories IR divergencies are also observed in far off-shell processes. For this reason, the usual procedure of reabsorbing IR...
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Saswato Sen (Okinawa Institute of Science and Technology)03/09/2026, 12:00Talk
We investigate the critical behavior of a family of $\mathbb{Z}_2$-symmetric scalar field theories on the Bethe lattice (the tree limit of regular hyperbolic tessellations) using both the non-perturbative Functional Renormalization Group and lattice perturbation theory. The family is indexed by the parameter $\zeta \in (0,1]$, which determines the range of the theory via the kinetic term...
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Denis Tolkachev (Joint Institute for Nuclear Research)03/09/2026, 12:00Talk
As has recently been shown, the approach of summing logarithmic quantum corrections based on the locality of quantum field theory leads to sets of linear differential equations. Sometimes, obtaining such equations is a hard task. Since renormalizable quantum field theory has Callan-Symanzik renormalization group equation, we can apply a linearization procedure that allows us to determine these...
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Facundo Gutierrez (Universidad de la Republica, Uruguay)03/09/2026, 12:00Talk
The increasing precision of gravitational-wave observations demands analytical frameworks capable of accurately describing the relativistic dynamics of compact binaries beyond standard perturbation theory. While post-Newtonian and post-Minkowskian expansions have been highly successful, their intrinsically perturbative nature limits their applicability in strongly relativistic regimes.
In...
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Kilian Fraboulet04/09/2026, 14:00Talk
Conventional implementations of the functional renormalization group (fRG) rely on regulators for bare propagators only, notably in the framework of the Wetterich equation. Starting from Schwinger-Dyson and Bethe-Salpeter equations, we develop an fRG formulation where both bare propagators and bare interactions can be dressed with regulators. This makes the resulting fRG setup more flexible,...
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Takeru Yokota04/09/2026, 14:00Talk
Although the formulation of the FRG is exact, practical calculations must be carried out approximately. This is because solvers for functional differential equations (FDEs), such as the Wetterich equation, have not yet been established. Meanwhile, physics-informed neural networks (PINNs) have recently gained attention as an efficient method for solving high-dimensional partial differential...
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Liubov Gosteva (UGA)04/09/2026, 14:00Talk
The Kuramoto-Sivashinsky (KS) equation describes various phenomena that exhibit instabilities, such as flames and reaction-diffusion systems. It resembles another famous non-equilibrium stochastic model - the Kardar-Parisi-Zhang (KPZ) equation, the main difference being the negative "viscosity" in the KS equation.
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It is known that the KS equation falls into the KPZ universality class, that... -
Tilman Enss (Heidelberg University)04/09/2026, 14:20Talk
We study critical phenomena in one-dimensional systems with long-range (LR) interactions, with a focus on the crossover to short-range universality. Employing functional renormalization group calculations and large-scale Monte Carlo simulations of self-avoiding Lรฉvy flights on a 1D lattice, we determine the anomalous dimension ฮท, the correlation length exponent ฮฝ, and the susceptibility...
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Hannes Braun (Technische Universitรคt Mรผnchen, Max Planck Institute for Solid State Research)04/09/2026, 14:20Talk
We develop a functional renormalization group (fRG) framework for two-dimensional Hubbard models whose fermions carry two independent flavor quantum numbers transforming under SU(N) and SU(M), respectively. Exploiting the product-group structure, we show that the two-particle vertex decomposes exactly into two independent scalar functions, reducing the one-loop flow to a closed system of...
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Yang-yang Tan04/09/2026, 14:20Talk
We employ deep neural networks to represent the field derivative of the scale-dependent effective potential in the functional renormalization group (fRG) framework for nonperturbative quantum field theory. By embedding the fRG flow equations directly into the loss function, the network parameters are determined so as to provide a continuous and differentiable representation of the scale- and...
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Dr Laura Batini04/09/2026, 14:40Talk
We develop a perturbative renormalization-group framework for dynamical critical theories that interpolates between overdamped and propagating dynamics. Although the formalism includes the purely dissipative Model-A limit as a special case, our main focus is the opposite regime, where dissipation is weak or absent and the dynamics is dominated by second-order time derivatives.
Within the...
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Andras Laszlo (HUN-REN Wigner Research Centre for Physics (HU))04/09/2026, 14:40Talk
In Euclidean signature, we show that under mild conditions a nonterminating Wilsonian renormalization group (RG) flow of Feynman measures has a factorization property: there exists a regularization-independent ultimate Feynman measure (UV limit), from which the flow originates via pushforward (marginal) by the regulators. In addition, we prove certain existence theorems on the UV limit...
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Richard Schmidt (Institute for Theoretical Physics, Heidelberg University, Germany)04/09/2026, 14:40Talk
In this talk I will discuss how the functional renormalization group (FRG) can be employed to study strongly interacting Bose-Fermi mixtures and, in particular, to predict and characterize mechanisms of boson-induced superconductivity. I will begin by reviewing how a self-consistent FRG framework captures the quantum phase transition from a polaronic condensate to a molecular Fermi gas...
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Prof. Stefan Floerchinger (University of Jena)04/09/2026, 15:00Talk
Functional renormalization group flow equations can be constructed to be ultraviolet finite but break reflection positivity / unitarity, or vice versa. We explore how this problem can be circumvented with flow equations of second or higher order. They respect unitarity and are ultraviolet finite, but their solution leaves certain integration constants open. We discuss the physical significance...
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Andreas Rรผckriegel (Frankfurt University)04/09/2026, 15:00Talk
At strong on-site repulsion U, the fermionic Hubbard model realizes an extremely correlated electron system. In this regime, it is natural to derive the low-energy physics with the help of non-canonical operators acting on a projected Hilbert space without double occupancies. Using a strong-coupling functional renormalization group technique, we study the physics of such extreme correlations...
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Olivier Coquand (LAMPS/University of Perpignan)04/09/2026, 15:00Talk
Depsite being ubiquitous in the universe, plasmas still remain today a quite mysterious state of matter. Among the difficulties describing them is the fact that, even when they are dilute, the Coulomb interaction between electrons and ions is a long-range strong force.
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In this talk, we show how the fRG tools can be used to get a better understanding of the interactions between structures at... -
Riccardo Finotello (CEA Paris-Saclay)04/09/2026, 15:20Talk
Detecting signals within nearly continuous spectra remains a fundamental challenge in statistical inference, particularly in high-noise regimes where standard random matrix theory approaches, such as the Baik-Ben Arous-Pรฉchรฉ (BBP) transition, frequently fail. We introduce a methodology that bridges statistical mechanics and statistical inference. By treating the empirical spectrum as an...
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Dr Thomas Sheerin (University of St Andrews)04/09/2026, 15:20Talk
The engineering of exotic ordered states in two-dimensional itinerant electron systems is a matter central to the field of quantum materials, from the viewpoints of both fundamental physics and applications. Ordinary Van Hove singularities (VHSs), logarithmic divergences in the density of states arising from quadratic saddle points in a materialโs dispersion, have long been known to induce...
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Antal Jakovรกc (Wigner Research Centre for Physics)04/09/2026, 15:20Talk
The conventional picture of the renormalization-group (RG) flow is that of a smooth evolution in coupling space, which becomes approximately linear in the vicinity of fixed points. In this framework, relevant and irrelevant directions are identified through the scaling properties of perturbations around the fixed point.
However, there are important physical situations in which the RG...
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