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7/6/26, 8:30 AM
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Adrian Kent (University of Cambridge)7/6/26, 9:00 AMInvited talk
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Max Joseph Fahn (University of Bologna and INFN Bologna)7/6/26, 9:45 AMInvited talk
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Peter Schupp (Constructor University Bremen)7/6/26, 11:00 AMInvited talk
Gravity shapes the geometric structure of the universe at large scales, with the motion of matter elegantly described as free fall in curved spacetime. Quantum algebras of operators and fields encode measurements and interactions down to the smallest scales. Recent research suggests a bridge between these scales and viewpoints: Deforming the algebraic structures of quantum theory, one can...
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Vittorio D'Esposito (University of Rome "Tor Vergata")7/6/26, 11:45 AMTalk
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Eyuri Wakakuwa (Nagoya University)7/6/26, 12:05 PMTalk
The concept of gravity-induced entanglement has been thoroughly investigated as a method for verifying the non-classical nature of gravity via tabletop experiments. Among various proposed setups, the test based on the frame-dragging effect aims to probe the quantum features of gravity in the post-Newtonian regime. From a theoretical and interpretative standpoint, the above mechanism remains...
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Ofek Bengyat7/6/26, 2:00 PMTalk
Quantum reference frame transformations embody a quantization of the notion of coordinate systems through using a superposition of classical coordinate systems. In this talk I will show that this can be extended to a notion of quantum coordinate transformations more general than superposition of classical ones. This more general notion will be "locally quantum”, as opposed to the current known...
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Kacper Dębski (Palacký University Olomouc)7/6/26, 2:20 PMTalk
Relativistic time dilation is usually described for clocks following classical trajectories. In quantum theory, however, a clock can move in a coherent superposition of different velocities or positions, making the experienced proper time state-dependent.
In this talk, I will discuss quantum time dilation in realistic clock models, focusing on an excited two-level atom whose lifetime and...
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Robin Oberfrank (Perimeter Institute)7/6/26, 2:40 PMTalk
Can high-energy quantum fluctuations leave an imprint at low energies? This question is central to understanding how ultraviolet physics enters infrared gravitational observables and whether such effects can produce observational signatures. In this talk, I will discuss these questions based on the analysis of the time delay fluctuations of null rays in the context of interferometric...
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Nicolo' Piccione (University of Trieste and INFN)7/6/26, 3:00 PMTalk
I will discuss the Gravitational Poissonian Spontaneous Localization (GPSL) model, a hybrid classical-quantum model in which classical Newtonian gravity emerges from stochastic collapses of the mass density operator and consistently couples to quantum matter. With respect to the widely more studied hybrid models based on continuous weak monitoring, GPSL differs in many aspects. Among them, it...
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Pietro Pellecchia (Istituto Nazionale di Fisica Nucleare)7/6/26, 3:50 PMTalk
A general expectation in quantum gravity is that spacetime may become fuzzy at the Planck scale, leading to an irreducible uncertainty in the measurement of spacetime observables. While these effects are typically studied through phenomenological models, spacetime fuzziness can be derived formally within a fundamental quantum spacetime framework.
In particular, employing the framework of a...
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Tadeusz Adach (University of Wrocław)7/6/26, 4:10 PMTalk
The Planck scale is expected to radically alter the structure of spacetime, which some believe to entail (at least at some effective level) a noncommutative spacetime with deformed symmetries described by a quantum group rather than an ordinary group. The $\kappa$-deformation of the Poincare Hopf algebra has been extensively studied as a candidate model for such an effect, and while its action...
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Federico Greco (Istituto Nazionale di Fisica Nucleare)7/6/26, 4:30 PMTalk
In Group Field Theory condensate cosmology, it is possible to derive the late-time dynamics of a FLRW universe filled with a massless scalar field, where the initial singularity is replaced by a quantum bounce at early times.
Within this framework, one can extract the effective equations of motion for the scalar field at both the background (homogeneous) and perturbed levels.
The results...
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Lisa Mickel (Institut d'Astrophysique de Paris (IAP))7/6/26, 4:50 PMTalk
In the quest to establish possible imprints of quantum gravity we consider so-called minisuperspace models that should be understood as a low energy limit of a full quantum gravitational theory. Starting from a bouncing minisuperspace model that resolves the big bang singularity, we will relax the assumption that the state of the quantum universe has to correspond to a single highly...
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Alba Domi7/7/26, 9:00 AMInvited talk
Neutrinos are powerful probes of fundamental physics: they interact only
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weakly and so propagate over astrophysical distances almost undisturbed,
they are detected over a broad in energy, and their flavour oscillations
provide a natural quantum interferometer. These features make the
neutrino sector one of the most promising windows onto quantum gravity,
where Planck-suppressed effects... -
Alberto Rosales de Leon (Durham University)7/7/26, 9:45 AMInvited talk
Lorentz Invariance Violation (LIV) remains one of the most compelling phenomenological avenues for testing Quantum Gravity (QG) effects with astrophysical observations. In the very-high-energy (VHE) gamma-ray regime, LIV can modify the kinematics of photon-photon pair production, leading to observable distortions in the spectra of distant extragalactic sources. These spectral signatures...
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Denitsa Staicova (Institute for Nuclear Researches and Nuclear Energy, Bulgaria)7/7/26, 11:00 AMTalk
Constraints on Lorentz invariance violation from gamma-ray burst spectral lags are limited by the well-known degeneracy between in-vacuo dispersion and intrinsic source-frame delays. We address this with a physics-informed neural network that pairs a cosmological-background network with an intrinsic-lag network designed to break the degeneracy non-parametrically. We apply the framework to...
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Dmitry Ofengeim (Hebrew University of Jerusalem)7/7/26, 11:45 AMTalk
The gamma-ray burst GRB 221009A provided a unique opportunity to test possible effects of quantum gravity. Observations of its very-high-energy (VHE, from sub-TeV to multi-TeV) afterglow by LHAASO allowed unprecedentedly stringent constraints to be placed on the energy scale of Lorentz invariance violation (LIV) [1]. Later, the air-shower array Carpet-3 reported the detection of a 300 TeV...
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Lina Breton-Zaourat (Laboratoire d'Annecy de Physique des Particules (LAPP))7/7/26, 12:05 PMTalk
Understanding quantum gravity remains one of the most challenging frontiers in modern physics. Thanks to new generations of Imaging Atmospheric Cherenkov Telescopes (IACTs) such as CTAO, we can now explore increasingly higher energies, accessing experimental observables that directly arise from quantum gravity theories. Lorentz Invariance Violation (LIV) is one such observable, and it can be...
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Tomislav Terzic (University of RIjeka)7/7/26, 2:00 PMTalk
We study the case of the GRB 221009A, the brightest gamma-ray burst of all time, and its implications on gamma-ray propagation through intergalactic space. In particular, we investigate how it can be used to investigate LIV-induced anomalies in the absorption of gamma rays on the background photon fields. We pinpoint the energy range that is the most interesting for this kind of studies,...
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Dr Wladimiro Leone7/7/26, 2:20 PMTalk
Quantum-gravity theories predict that spacetime may deviate from the smooth description of general relativity near the Planck scale, potentially producing tiny energy-dependent delays in high-energy photons. We present an energy-resolved timing method to test Lorentz Invariance Violation using gamma-ray bursts and pulsars. The method models the observed time lag as the sum of an intrinsic...
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Robertus Potting (University of Algarve)7/7/26, 2:40 PMTalk
Quantum gravity effects can originate modified vacuum dispersion relations for photons and cause differences in propagation times for photons emitted simultaneously from gamma-ray bursts, active galactic nuclei, or pulsars. Consequently, observations of energy-dependent photon time delays from distant flaring sources can provide strong constraints on Lorentz invariance violation (LIV). These...
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Aneta Wojnar (University of Wroclaw)7/7/26, 3:00 PMTalk
A central focus of the presentation is the role of thermodynamics in understanding physical phenomena. In particular, the talk highlights the need for a consistent formulation of thermodynamics in systems governed by long-range interactions, especially gravity. I will also present a recently proposed experimental approach combining muon detection techniques with seismic waves as a novel way to...
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Mr Ardit Gkioni (Universidad de Zaragoza)7/7/26, 3:50 PMTalk
We present a framework to compute vacuum Cherenkov radiation and photon decay in a dimension-six Lorentz-violating extension of QED. Using the collinear approximation, we derive decay rates which include mass effects, going beyond the asymptotic regime of very high energies. The obtained expressions provide therefore an appropriate description of the processes close to their thresholds and are...
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Maykoll A. Reyes (University of Zaragoza)7/7/26, 4:10 PMTalk
We revisit the role of vacuum Cherenkov radiation and photon decay as probes of Lorentz invariance violation. We show that these processes constrain not only superluminal but also subluminal scenarios. A combined analysis leaves a narrow region of parameter space compatible with observations.
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José Manuel Carmona (CAPA / Universidad de Zaragoza)7/7/26, 4:30 PMTalk
We discuss a scenario in which Lorentz violation is universal across particle species, as suggested by constraints from high-energy photon and electron stability. We outline its phenomenological implications and theoretical interpretations.
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Diego Buccio (Heidelberg University)7/7/26, 4:50 PMTalk
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... -
Gedrich Jiann Dy (University of Bremen)7/7/26, 5:10 PMTalk
We hope to constrain the allowable quantum gravity corrections to the classical black hole by extracting phenomenology from the modified dispersion relation of a Fock-quantized electromagnetic field in a semiclassical loop quantum gravity (LQG) black hole. Under the framework of pre-metric electrodynamics, we determine the propagation of light by deriving the effective Fresnel equation (the...
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Dr Luca Buoninfante7/8/26, 9:00 AMInvited talk
A major theoretical insight of the last century was that strict renormalizability provides a powerful criterion for selecting Lagrangians in perturbative quantum field theory. The Standard Model (without gravity) satisfies this criterion, whereas the inclusion of gravity appears to violate it, since general relativity is perturbatively non-renormalizable. In this talk, I present concrete...
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Francesco Del Porro (Istituto Nazionale di Fisica Nucleare)7/8/26, 9:45 AMInvited talk
In the search for a consistent and perturbatively renormalizable theory of quantum gravity, Hořava gravity stands as a proposal in which local Lorentz invariance is abandoned in order to achieve power-counting renormalizability. In its projectable version, the theory has been shown to be renormalizable and asymptotically free. For the full theory, however, the breakdown of Lorentz invariance...
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Prof. Radoslav Rashkov7/8/26, 11:00 AMInvited talk
In this talk, we explore certain mathematical structures underlying (holographic) entanglement entropy. In an effort to understand entanglement in finite-dimensional quantum systems, we construct analogs of (co)differentials and (co)chain complexes, thereby establishing a framework that bridges quantum information theory and algebraic topology. We show that these constructions give rise to a...
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Martin Krssak (Comenius University in Bratislava)7/8/26, 11:45 AMTalk
Classical solutions with a finite Euclidean action--known as instantons--play an important role in quantum gravity since they determine the dominant contributions to the gravitational path integral. In the teleparallel formulation of general relativity, instantons can be obtained without introducing Gibbons-Hawking-like boundary terms, but the result depends on a non-dynamical spin connection....
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Otari Sakhelashvili (Ludwig-Maximilians-Universität München)7/8/26, 12:05 PMTalk
In this talk, I will argue that the consistency of non-perturbative $\theta$-vacua in gauge theories and gravity predicts the presence of axion-like particles (ALPs) in the particle spectrum. This prediction also necessitates additional structures in these theories. Specifically, General Relativity incorporates Eguchi-Hanson instantons, which generate gravitational $\theta$-vacua. The...
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Prof. Eduardo Guendelman (Ben Gurion University)7/8/26, 2:00 PMTalk
The string tensions can be dynamical in the modified measure formalism and appear as an additional dynamical degrees of freedom . These tensions may not be universal, instead, each string generates its own tension. We then consider a new bulk field that can couple to the strings, the tension scalar which changes locally the tension along the world sheet. In the case with two string tensions...
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18. Swampland-Compatible Dark Matter–Dark Energy Interactions that Do Not Resolve the Hubble TensionKay Lehnert (National University of Ireland, Maynooth)7/8/26, 2:20 PMTalk
We assess a cosmological model in which dark energy is realised as a dynamical quintessence scalar field $\phi$ with a hyperbolic tangent potential $V(\phi) = \mathfrak{c}_1[1 - \tanh(\mathfrak{c}_2\phi)]$, coupled to dark matter through a field-dependent mass $m_\mathrm{DM}(\phi) = m_0[1 - \tanh(\mathfrak{c}\,\phi)]/2$.
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The model is motivated by the swampland programme: a cosmological... -
Georg Trenkler (IBS CTPU-CGA)7/8/26, 2:40 PMTalk
Black holes beyond General Relativity may carry non-standard charges that affect their phenomenology and potentially provide a window for probing gravity across a large separation of scales: from large-scale cosmology to the strong-field regime. In this talk, I will discuss the scalar charge induced by a scalar–Gauss–Bonnet coupling and examine how it is affected in the presence of a...
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Nikola Konjik (Faculty of Physics, University of Belgrade)7/8/26, 3:00 PMTalk
In this presentation will be shown some systematization of LIV interactions between photon and real scalar field (DM model). After I introduce model of LIV interactions, some specific processes will be analyzed: photon (GRB) - photon (CMB) scattering with scalar DM particle as mediator via LIV interactions.
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Prof. Goran Djordjevic (SEENET-MTP Centre, and Faculty of Science, University of Niš)7/8/26, 3:50 PMTalk
A tachyon field may be responsible for cosmological inflation in the early universe and contribute to dark matter. We consider a class of inflation models where the slow-roll parameters follow a linear relation mediated by a slowly varying function. We discuss the obtained analytical results for the observational parameters, and the possibility of calculating the Hubble parameter, field...
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Petr Kotlařík (Astronomical Institute of CAS Prague, YITP Kyoto)7/8/26, 4:10 PMTalk
When a black hole (BH) rings due to an external perturbation, it emits gravitational waves described by quasi-normal modes (QNMs) – a series of exponentially damped harmonic oscillations. If the Kerr(-Newman) metric fully describes the BH, the QNMs carry a unique signature of the BH parameters encoded in the modes' complex frequencies. Consequently, any deviation in the QNM spectrum from the...
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Todor Popov7/8/26, 4:30 PMTalk
We present an approach to the hidden conformal symmetries of the Landau problem bases Jordan algebras. Then we make some parallels with the conformal symmetries in the vicinity of black hole horizons.
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Ladina Hausmann7/9/26, 9:00 AMInvited talk
Defining subsystems relative to physical reference frames is subtle: naive definitions give rise to a problem known as the paradox of the third particle. The paradox is often seen as a quantum effect, since it seems to require reference frames in superposition. In this talk, I show that the same paradox arises already in classical mechanics. The source of the paradox, therefore, does not lie...
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Kristian Piscicchia (Istituto Nazionale di Fisica Nucleare)7/9/26, 9:45 AMTalk
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Catalina Oana Curceanu (Istituto Nazionale di Fisica Nucleare)7/9/26, 11:00 AMTalk
Quantum mechanics provides an extraordinarily successful description of Nature, yet its conceptual foundations remain incomplete when confronted with gravity. Several approaches to quantum gravity predict modifications of standard quantum principles, including deformations of the uncertainty principle, spacetime fuzziness, intrinsic decoherence effects, and possible tiny violations of the...
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Tsvetan Vetsov7/9/26, 11:20 AMTalk
We establish a framework for geometric optimal control theory by demonstrating how classical, quantum, and thermodynamic information metrics locally converge to guide the most energy-efficient transitions along geometric geodesics. The framework is applied to optimize black hole thermodynamics—specifically modeling the non-linear generation of rotations in static BTZ black holes—while offering...
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Piotr Grochowski (Palacký University Olomouc)7/9/26, 11:40 AMTalk
Quantum control and engineering of massive quantum systems are becoming increasingly relevant for quantum-enhanced sensing and experimental tests of fundamental physics, including macroscopic quantum coherence and gravity-related phenomena. The presented works focus on the preparation and exploitation of non-Gaussian motional states in continuous-variable systems. This includes rapid...
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45. Swampland-compatible dark matter–dark energy interactions that do not resolve the Hubble tensionKay Lehnert (National University of Ireland, Maynooth)Talk
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