Calendar

Mag
26
Mer
Semiclassical gravity and evaporation of dynamical black holes sourced by the quantum trace anomaly @ online
Mag 26@11:00 am–12:00 pm

Seminario di Fisica Teorica – Paolo Meda (Università di Genova e INFN di Genova)

A first approximation to describe the interplay between quantum matter and gravity is given by the quantum field on curved spacetimes and the semiclassical gravity, in which the backreaction of a quantum matter field propagating over a fixed spacetime geometry can be analyzed by using the so-called semiclassical Einstein equation. In this framework, the evaporation of four-dimensional spherically symmetric black holes can be explained by the appearance of an ingoing negative energy flux at the apparent horizon, which induces a negative variation of the black hole mass. I will show that this flux can be sourced by the trace anomaly of the quantum stress-energy tensor in case of a massless conformally-coupled scalar field once a certain averaged energy condition is assumed outside the horizon. As an example, I will compute the negative flux and the rate of evaporation in the Vaidya spacetime, which describes the exterior geometry of a null radiating star.

Per partecipare: collegarsi al meeting Zoom

Topic: Theory and Pheno seminars

https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Mag
31
Lun
CDS @ on-line
Mag 31@2:00 pm–3:00 pm

Consiglio di Sezione

Il Consiglio verterà sul seguente Ordine del Giorno:
1) Comunicazioni del Direttore dal Consiglio Direttivo
2) Nuova procedura acquisti in contanti (intervento di Barbara Artivi)
3) Varie ed eventuali

Giu
9
Mer
Gli esperimenti WA82 e WA92: un’eredità di silicio @ online
Giu 9@11:00 am–12:00 pm

Seminario Colloquium (D.Barberis, G.Darbo, C.Gemme, L.Rossi – INFN Sezione di Genova)

La sezione di Genova dell’INFN ha un ruolo leader in Italia, oramai da due decenni, nello sviluppo, nella realizzazione e nell’utilizzo dei rivelatori a Pixel di silicio. Questa attivita’ ha le sue radici negli esperimenti WA82 e WA92 fatti al SPS del CERN nel periodo 1985-1995. Il seminario descrive questi esperimenti, le tecniche utilizzate e i risultati raggiunti e si sofferma infine sui motivi che hanno consentito a Genova di diventare un laboratorio di riferimento per i rivelatori a pixel.

Per partecipare: collegarsi al meeting:
Topic: Seminario: ‘Gli esperimenti WA82 e WA92: un’eredità di silicio.’
https://cern.zoom.us/j/61353452752?pwd=ZmVzemJtblNuTGVzQWU4QXBPa0J1Zz09
Meeting ID: 613 5345 2752
Passcode: 128258

Giu
16
Mer
TOTEM and D0: the observation of the Odderon @ on-line
Giu 16@11:00 am–12:00 pm

Colloquium – Dr. Fabrizio Ferro (INFN Sezione di Genova)

The Odderon, first theorized in 1973, represents the C-odd counterpart of the Pomeron, the dominant Regge trajectory in the soft high energy diffractive interactions. The Odderon emerges not only in the Regge framework, but also in QCD theory where it can be modelled as an exchange of a colourless C-odd gluonic compound. States comprising two, three or more gluons are usually called “glueballs”, and their observation represents a key test of the QCD. The TOTEM experiment at LHC has performed total and differentialelastic p-p cross-section measurements at different LHC energies.
Since 2018 a first hint of the presence of the Odderon was found in TOTEM results. Now the discovery has been confirmed after a comparison with the p-bar-p data measured by the D0 collaboration at Fermilab. The comparison of the two experiment results led to the first experimental observation of the exchange of the Odderon with a significance of 5.4σ.

Per partecipare: collegarsi al meeting:
Topic: Colloquium: TOTEM and D0: the observation of the Odderon
Join Zoom Meeting
https://cern.zoom.us/j/67205268399?pwd=cmlMTkdEZEFONExwbytNODZBbXVBUT09
Meeting ID: 672 0526 8399
Passcode: 195167

Giu
23
Mer
Quantum simulations and computations for Lattice Gauge Theories @ on-line
Giu 23@11:00 am–12:00 pm

Seminario di Fisica Teorica – Dr.ssa Elisa Ercolessi (Università di Bologna)

Quantum technologies offer a platform for analogue simulations and digital quantum computations of Lattice Gauge Theories within a Hamiltonian approach.
We will discuss the theoretical framework necessary to approximate the continuous theory, giving some examples of both abelian and non-abelian discrete models.
We will discuss how this approach allows also for the study of non-perturbative effects and real-time dynamics.

Per partecipare: collegarsi al meeting Zoom
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Giu
28
Lun
CDS @ on-line
Giu 28@1:30 pm–6:00 pm

Consiglio di Sezione – Preventivi

Giu
29
Mar
CDS @ on-line
Giu 29@1:30 pm–6:00 pm

Preventivi

Ott
4
Lun
CDS @ on-line
Ott 4@2:00 pm–3:00 pm

Consiglio di Sezione – Bilancio

Ott
6
Mer
Conformal Colliders Meet the LHC @ on-line
Ott 6@2:00 pm–3:00 pm

Seminario DIFI/INFN di Fenomenologia delle Particelle Elementari – Prof. Ian Moult (Yale University)

Collimated sprays of hadrons, called jets, are an emergent phenomenon of Quantum Chromodynamics (QCD) at high energies. Understanding the detailed energy flow, or substructure, of jets has come to play a central role at the Large Hadron Collider (LHC), where it has enabled new ways to search for physics beyond the Standard Model, as well as new insights into the strong interactions.

In this talk I will present recent developments in improving our theoretical understanding of jet substructure using insights from conformal field theory. I will show that jet substructure can be formulated as the study of matrix elements of particular lightray operators enabling the use of powerful techniques such as the operator product expansion (OPE), and providing an alternative approach to thinking about jet substructure more closely related to scaling phenomena. I will then show that the remarkable data quality of the LHC allows the scaling behavior predicted by the OPE to be directly measured in data, illustrating an interesting interplay between recent developments in CFT and LHC phenomenology.

Per partecipare: collegarsi al meeting Zoom
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271

Ott
14
Gio
Black-Hole Scattering, Eikonal Exponentiation and Gravitational Waves @ Aula 603 e online
Ott 14@11:00 am–12:00 pm

Seminario di Fisica Teorica INFN/DIFI – Carlo Heissenberg (Nordita, Stockholm, Sweden)
The eikonal exponentiation of gravity amplitudes is a non-perturbative re- summation whereby certain high-energy divergent terms, which would naively violate unitarity bounds, combine into a harmless phase factor. Eikonal tech- niques also offer a natural strategy to calculate classical gravitational observables directly from the loop-expansion of scattering amplitudes. In this talk, I will discuss how the eikonal can be applied to obtain the deflection angle for the collision of two non-spinning black holes with generic center-of-mass energies, up to order O(G3). This calculation captures both conservative and dissipa- tive radiation-reaction effects, and yields a deflection angle with a smooth behavior at high energies, where it agrees with the universal massless result. Besides explicit two-loop calculations, I will also illustrate a shortcut to access radiation-reaction effects based on analyticity, unitarity and crossing symmetry. Finally, I will sketch how the classical limit of inelastic five-point amplitudes fits in the eikonal exponentiation of elastic four-point amplitudes and provides the leading-order waveforms for the emission of gravitational waves.

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Per partecipare in presenza, prenotarsi seguendo il link
https://docs.google.com/document/d/1uaw5DHG0VykTHraDiAqYjbLFXsrOIXaftj_n04sj4PE/edit?usp=sharing
oppure per partecipare su Zoom, collegarsi al meeting
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271
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