Annual Meeting Iniziativa Specifica QGSKY INFN Gruppo 4

Contribution List

2. Initial addresses

10/17/19, 9:30 AM

3. A new technique for the scalar wave equation in curved space-time

Giampiero Esposito

10/17/19, 9:40 AM

We prove that the equation for the amplitude function for the parametrix of the scalar wave equation can be obtained by covariant differentiation of a first-order non-linear equation.
The construction of such a first-order non-linear equation relies upon a pair of auxiliary 1-forms "psi,rho".
The 1-form "psi" satisfies the divergenceless condition div(psi)=0, whereas the 1-form "rho"...

4. Connecting cosmography with early times

Micol Benetti

10/17/19, 10:10 AM

Recently, the cosmographic approach has gain considerable interest as model-independent technique able to describe the recent expansion of the universe.
Indeed, given only the observational assumptions of the cosmological principle, it permits the study of the dark energy (or modified gravity) evolution without the need of assuming a specific cosmological model.
Up to now, the cosmographic...

5. Lectio Magistralis: Gravitational waves and multi-messenger astronomy: a new window on the Universe

Barbara Padricielli

10/17/19, 11:10 AM

The first two observing runs of Advanced LIGO and Advanced Virgo have been characterized by several groud-breaking discoveries.
On September 14, 2015, there was the the first observation of gravitational waves (GWs) from the merger of a binary black hole (BBH);
two years later, on August 17, 2017, there was the first joint detection of GWs and photons from a binary neutron star merger: this...

6. Low Surface Brightness galaxies: new hints for dark matter?

Chiara Di Paolo

10/17/19, 12:10 PM

I will talk about the relevance of the universal rotation curve (URC) method applied to rotating disc galaxies and, particularly, I will focus on the results obtained by analysing a special sample of galaxies called Low Surface Brightness (LSB) galaxies.
Furthermore, I will briefly talk about the relevance of the LSB results when compared to the Radial Acceleration Relation (RAR) given by...

7. The scattering angle of a two-body system: checks at 3PM - 5PN level

Donato Bini

10/17/19, 2:30 PM

Some recent progress in the analytic treatment of the scattering angle in a two-body system will be shortly discussed.

8. Probing the nature of neutrinos through decoherence and geometric phases

Aniello Quaranta

10/17/19, 3:00 PM

We analyze the non-cyclic geometric phase and the phenomenon of decoherence for neutrinos propagating in long baseline experiments.
We find that the geometric phase and the total phase associated to the mixing phenomenon provide a theoretical tool to distinguish between Dirac and Majorana neutrinos.
Moreover, we show that, in presence of an off-diagonal term in the dissipative matrix, the...

9. Cosmography in extended theories of gravity

Rocco D'Agostino

10/17/19, 3:30 PM

In this talk, we provide an overview of the cosmographic technique in the context of extended and modified theories of gravity, invoked to tackle the dark energy problem.
We show how cosmography can be used to reconstruct the late-time expansion history of the universe with no a priori assumptions on its equation of state.
In particular, we present a new method involving the use of rational...

10. Casimir effect in a weak gravitational field: "Schwinger's approach”

Francesco Sorge

10/17/19, 4:30 PM

In this paper we discuss the Casimir effect in a small cavity at rest in the weak gravitational field of a massive, non-rotating source.
We propose a new approach, based upon Schwinger's effective action method, showing that the gravitational interaction induces a small correction in the vacuum energy density, in full agreement with the result we obtained in a previous work (Sorge F 2005...

11. Round Table of the Day's Speaker

10/17/19, 5:20 PM

12. Communications on GQSKY

Lambiase

10/18/19, 9:30 AM

13. M87 the galaxy with imaged Supermassive BH

Paolo Salucci

10/18/19, 10:00 AM

M87 is the biggest nearby galaxy located at the center of the Virgo cluster.
It hosts multiple kinematic tracers that have recently allowed a very good determination of its mass distribution from the very center up to the virial radius.
In this work, we approach the question by adopting the Burkert halo profile for the dark matter which well represents the dark matter halos around spirals and...

14. A multifiltering study of turbulence in a large sample of simulated galaxy clusters

Riccardo Valdarnini

10/18/19, 11:00 AM

In this paper, we present results from a large set of N-body/SPH hydrodynamical cluster simulations aimed at studying the statistical properties of turbulence in the ICM.
The numerical hydrodynamical scheme employs a SPH formulation in which spatial gradients are estimated using an integral approach.
This formulation strongly reduces gradient errors which are found to critically affect SPH...

15. On the physical origin of the cosmological constant: planckian fluctuations, decoherence scale and comparison with the Casimir effect.

Stefano Viaggiu

10/18/19, 11:30 AM

In this talk I present a new proposal concerning the nature of the cosmological constant depicted in terms of Planckian fluctuations.
A semi-classical model is presented with a Planckian generalization of the quasi local Misner-Sharp energy.
The observed (dressed) value of \Lambda is fixed at the scale such that an absolute positive minimum for the generalized Misner-Sharp energy is reached:...

16. Study of the dark matter distribution in High redshift galaxies using Rotation Curves.

Gauri Sharma

10/18/19, 12:00 PM

We have analysed the Rotation Curves (RCs) of 310 Hα detected star-forming galaxies from KMOS redshift one spectroscopic survey (KROSS).
The targets were selected from four deep extragalactic fields those are covered by wide range of multiwavelength photometric and spectroscopic surveys:
1) Extended Chandra Deep Field Survey (E-CDFS);
2) Cosmic Evolution Survey (COSMOS);
3) Ultra-Deep...

17. A white paper for GQSKY

10/18/19, 12:30 PM

18. Classical and quantum states of the universe

Cosimo Stornaiolo

10/18/19, 2:30 PM

I show that one can unify the description of quantum and classical cosmological states by introducing the tomographic description.
I'll present some examples of possible classical tomograms obtained phenomenologically and the problems that one has to address in order to relate these tomograms to the original quantum state of the universe.

19. Merging rates of compact binaries in galaxies

Lumen Boco

10/18/19, 3:00 PM

In this talk I will investigate the merging rates of compact binaries and the related detection rates of gravitational waves with current (AdvLIGO/Virgo) and future detectors (Einstein Telescope).
I will rely on three main ingredients:
1) a redshift dependent galaxy statistics observationally determined;
2) a star formation and chemical enrichment history for individual galaxies inferred from...

20. Neutrino oscillations in Unruh radiation: the proton’s testimony

Gaetano Luciano

10/18/19, 3:30 PM

The study of the inverse beta-decay of accelerated protons (p → n + e + νe) recently provided a theoretical proof of the necessity of the Unruh effect in QFT.
Indeed, on the basis of the sole requirement of General Covariance of the formalism, it was found that the decay rates in the inertial and comoving frames are in agreement only when taking into account the thermal nature of the...

21. Round Table of the Day's Speaker

10/18/19, 4:00 PM