Annual Meeting QGSKY - Quantum Universe

Session

Friday 9:20 - 11:00

6 Oct 2023, 09:20

Aula Mazzini - Sede Storica UniGe via Balbi 5 (Genova)

17. Gravitational memory of Casimir effect

Francesco Sorge (Istituto Nazionale di Fisica Nucleare)

06/10/2023, 09:20

We investigate the influence of a time-varying spacetime background on the vacuum polarization of a massless quantum field confined to a Casimir cavity. The background is modelled as an anisotropic Bianchi-I spacetime, in which small time-dependent perturbations around the flat spacetime are vanishing in the far past and future. The spacetime admits asymptotic Minkowskian regions, thus...

2. The Different Faces of Cosmography

Micol Benetti (Istituto Nazionale di Fisica Nucleare)

06/10/2023, 09:40

Recently, the cosmographic approach has gained considerable interest as a model-independent technique that can describe the recent expansion of the universe. In fact, given only the observational assumptions of the cosmological principle, it makes it possible to study such an evolution without assuming a specific cosmological model. In this talk I will show some of the most promising lines of...

10. The Hubble constant tension: The Classical Cepheid point of view

Giulia De Somma (Istituto Nazionale di Fisica Nucleare)

06/10/2023, 10:00

One of the most debated issues in astrophysics is the discrepancy, which ranges between 4 to 6 sigma, between the locally estimated value of the Hubble constant using the SNeIa distance scale calibrated with Classical Cepheids and the cosmological value derived from Cosmic Microwave Background Radiation (CMBR). This problem is commonly referred to as the Hubble constant tension and represents...

6. The Gravitational Energy-Momentum Pseudo-Tensor in Higher Order Theories of Gravity

Salvatore Capozziello (Università di Napoli "Federico II")

06/10/2023, 10:20

We discuss the generalization of gravitational energy-momentum pseudo-tensor to Extended Theories of Gravity, in particular to higher-order theories in curvature invariants. This result is achieved by imposing that the local variation of gravitational action of any order vanishes under rigid translations. We also prove that this tensor, in general, is not covariant but only affine, that is, it...

22. Tomography of the Universe: a new way to investigate the properties of the universe and their origin

Cosimo Stornaiolo (Istituto Nazionale di Fisica Nucleare)

06/10/2023, 10:40

In this talk, I give a definition for the phenomenological tomogram of the universe. I introduce the theoretical classical and quantum tomograms. I show how we could investigate the primordial quantum state of the universe from the possible deviations of the phenomenological tomogram from the classical tomogram.