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Renata Ferrero08/07/2026, 12:00contributed talk
In quantum field theory, coarse graining (or renormalization) is a well-established procedure: physics is formulated on a fixed spacetime background, correlators are computed between fields at different points, and the renormalization group organizes physics in terms of length scales defined by external rulers. In quantum gravity, this framework has to be reconsidered: there is no fixed...
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08/07/2026, 12:40
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Carlo Rovelli (Aix-Marseille University)08/07/2026, 13:40invited talk
With Niccolò Covoni and Andrea di Biagio, we are finishing a book merging our previous works in philosophy and mathematics, on the best way to think the relational view of quantum mechanics. To this aim, we have re-edited Wittgenstein celebrated "Tractatus", taking the Quantum into account. I illustrate our results, synthesized in the 7 propositions:
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1. The world is everything that is the... -
Fabio Mele (LSU)08/07/2026, 14:50invited talk
Quantum reference frames (QRFs) are internal subsystems that transform non-trivially under a symmetry group and provide the means to describe quantum systems "from the inside" in purely relational terms. QRFs are therefore essential whenever no external reference frame for the relevant symmetry group is available. As such, they play a central role in several research areas, ranging from...
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Paolo Luppi (University of Milan)08/07/2026, 15:30contributed talk
The subsystem structure of quantum theory is relative to the choice of quantum reference frame (QRF). This raises a basic question for open quantum systems: is decoherence an intrinsic property of the system–environment interaction, or can part of it arise from the physical reference frame used to describe the system?
I will address this question through reduced quantum-reference-frame...
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Matteo Bruno (Centre de Physique Théorique (CPT))08/07/2026, 16:10contributed talk
The physical projector (or rigging map in Refined Algebraic Quantization) is a powerful tool in the quantisation of constrained systems. In this talk, we argue that the physical projector alone —even without well-defined quantum constraint operators— is sufficient to define physical states and physical observables, within an framework alternative to the relational approach.
This viewpoint...
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Bruno Torres (Ghent University)09/07/2026, 17:20contributed talk
Recent developments in quantum gravity have emphasized the role of an "observer" in making sense of quasi-local quantum-gravitational effects. In this talk, we will describe an explicit model of a gravitationally dressed observer in Jackiw-Teitelboim (JT) gravity. This is a dilaton gravity model in two spacetime dimensions that is fully solvable both classically and quantum-mechanically,...
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Luca Cafaro (University of Warsaw)09/07/2026, 18:00contributed talk
We present a loop quantization of the marginally bound Lemaitre-Tolman-Bondi (LTB) model, describing the gravitational collapse of pressureless dust in spherical symmetry. The full quantum LTB model is constructed as a collection of noninteracting shells, each governed by an individual single-shell loop quantum dynamics. We show that the single-shell evolution is non-singular and that wave...
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Antonio Vicente-Becerril (IEM-CSIC (Madrid))09/07/2026, 18:40contributed talk
In this talk, I examine the impact of the hybrid and dressed-metric quantization approaches in loop quantum cosmology (LQC) on the angular power spectrum of cosmological perturbations. We introduce a new parametrization of the primordial power spectrum which depends on the characteristics of the quantum bounce epoch. For a total cosmic expansion of about 140 e-folds, the model predicts a...
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