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(morning)
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30/03/2026, 09:00
Title: A healthier stochastic semiclassical gravity: world without Schrödinger cats
Abstract: Semiclassical gravity couples classical gravity to the quantized matter in the mean-field approximation, which is problematic for two reasons. It ignores the quantum fluctuation of matter distribution, and it violates the linearity of the quantum dynamics. The first problem can be mitigated by...
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30/03/2026, 09:50
Title: Quantum coordinate transformations via matter fields for quantum spacetime
Abstract: A central challenge in quantum gravity is to formulate a theory without presupposing a background spacetime. Such a description requires relational observables and a genuinely quantum generalisation of diffeomorphisms. Here we associate coordinate systems with sets of four dynamical scalar fields,...
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30/03/2026, 11:10
Title: Deformed CPT Symmetry from Curved Momentum Space
Abstract: The asymmetry of curved momentum space in κ-deformed field theories sheds new light on the fate of CPT symmetry in deformed relativistic frameworks based on Hopf algebras. Based on our recent work (Phys. Rev. D 113 (2026) 2), we show that charge conjugation is incompatible with κ-Poincaré invariance, while the geometric...
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30/03/2026, 11:35
Title: Doubly Quantum Mechanics
Abstract: Motivated by the expectation that relativistic symmetries might acquire quantum features in Quantum Gravity, we take the first steps towards a theory of “Doubly” Quantum Mechanics, a modification of Quantum Mechanics in which the geometrical configurations of physical systems, measurement apparatuses, and reference frame transformations are...
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30/03/2026, 12:00
Title: A nonlinear gravitisation of quantum field theory?
Abstract: We develop a relativistically causal generally covariant gravitisation of quantum field theory. The resulting model is similar to Møller-Rosenfeld semiclassical gravity: the classical gravitational field is sourced by the expectation value of the quantum stress-energy tensor, though now taken with respect to the local...
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30/03/2026, 12:25
Title: Is the many-worlds interpretation of quantum theory counter-intuitive?
Abstract: The many-worlds (Everett) interpretation of quantum mechanics is very well adapted for the application to cosmology because it does not require the existence of an external observer. At the same time it is often considered as being a "counter-intuitive". Analyzing the problem of the choice of the...
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30/03/2026, 14:20
Title: Testing Quantum Mechanics Underground: Collapse models and Pauli
Exclusion PrincipleAbstract: We are experimentally investigating possible departures from the standard quantum mechanics’ predictions at the Gran Sasso underground
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laboratory in Italy. In particular, with radiation detectors we are searching for signals predicted by the collapse models (spontaneous emission of... -
30/03/2026, 15:10
Title: Planckian bound on IR/UV mixing from cold-atom interferometry
Abstract: IR/UV mixing (a mechanism causing ultraviolet quantum-gravity effects to manifest themselves also in a far-infrared regime) is a rare case of feature found in several approaches to the quantumgravity problem. We here derive the implications for ”soft” IR/UV mixing (corrections to the dispersion relation that are...
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30/03/2026, 15:35
Title: Stochastic gravitational waves in classical gravity
Abstract: The quest for a quantum description of gravity has been long, diverse, and productive. Yet, despite decades of theoretical progress, there is still no direct experimental evidence for the quantum nature of spacetime. In this talk, I explore an alternative, indirect route to probing quantum gravity by assuming the...
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30/03/2026, 16:00
Title: Excitations of Spacetime in a Quantized Field
Abstract: We investigate the possibility of a Proper Time Oscillator—the temporal analog of the quantum harmonic oscillator. Such an oscillator exhibits the same properties consistent with those of a particle in both quantum theory and general relativity. First, we find that spacetime can be quantized at a distance scale much larger than...
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30/03/2026, 16:55
Title: Gravity model from (A)dS Yang-Mills theory
Abstract: We investigate the relationship between a one-parameter family of (anti-)de Sitter Yang-Mills models and a model of Einstein-Palatini gravity with matter, realized through Inönu-Wigner contraction of the (A)dS algebra. By setting the group parameter to zero, the gauge transformation of the potential becomes consistent with the...
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30/03/2026, 17:20
Title: An inequality for relativistic local quantum measurements
Abstract: We investigate the trade-off between vacuum insensitivity and sensitivity to excitations in finite-size detectors, taking measurement locality as a fundamental constraint. We derive an upper bound on the detectability of vacuum excitation, given a small but nonzero probability of false positives in the vacuum state....
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30/03/2026, 17:45
Title: Black Hole Information From Non-vacuum Localised Quantum States
Abstract: We revisit Hawking's black hole radiation derivation, including the quantum state of the initial matter forming the black hole. We investigate how non-vacuum initial quantum states, at the past of a black hole geometry, influence the black hole radiation observed at future null infinity. We further classify...
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