Events and outreach

Seminars
Oct
28
Thu
Axion dark matter with low-scale inflation @ Aula 603 e online
Oct 28 @ 11:00 am – 12:00 pm

Seminario di Fenomenologia delle Particelle Elementari INFN/DIFI – Dr Lorenzo Ubaldi (SISSA)

After a brief introduction to the strong CP problem, I will introduce the axion as a solution and explain how it also provides a cold dark matter candidate. In the second part of my talk I will focus on cosmological scenarios with a low scale of inflation, and discuss a mechanism that can generate enough axion relics to match the observed dark matter abundance even in such scenarios.

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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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Nov
4
Thu
Exact solutions to Einstein’s field equation coupled to dust @ Aula 603 e online
Nov 4 @ 11:00 am – 12:00 pm

Seminario di Fisica Teorica INFN/DIFI – Davide Astesiano (Università dell’Insubria)

To analyze the dynamics of a single spiral galaxy, we will discuss the known class of exact stationary axially-symmetric solutions to Einstein gravity coupled with neutral dust. Differently from the Newtonian description of the same system where all the quantities are completely fixed once the velocity or the matter distribution are known, the class of the relativistic solutions provides additional degrees of freedom, making the applications of this system much more interesting and wide. Up to now, from the relativistic perspective the already proposed models for galaxies are the co-rotating and the differentially rotating model. While in the first case the velocity of the dust satisfies L_u(g) = 0, in the second case it differs from zero. What is interesting about these solutions is that the low energy limits are non equivalent to the Newtonian theory. In particular, the differentially rotating case generalize the known results of Balasin and Grumiller and further highlights the discrepancy between Newtonian theory of gravity and general relativity at low velocities and energy densities. Using these exact solutions, we push forward the idea that the inertia of the gravitational field can simulate dark matter effects. In fact, we show that non co-rotance further reduces the amount of energy density required to explain the rotation curves for spiral galaxies.

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

Consiglio di Sezione

Nov
11
Thu
Recent jet measurements on ALICE @ Aula 603 e online
Nov 11 @ 11:00 am – 12:00 pm

Seminario INFN/DIFI di fenomenologia delle particelle elementari – Dr. Ezra Lesser (UC Berkeley)

In recent years, jet and jet substructure observables have been used at the LHC as instruments to search for new physics as well as to test perturbative and probe non-perturbative processes in QCD. Some observables are infrared and collinear (IRC) safe and thus easily comparable to first-principles calculations, while others offer direct insight into specific physical phenomena such as the quark-gluon plasma (QGP) formed in heavy-ion collisions. The high-precision capability of the ALICE tracking system allows a unique opportunity at LHC energies to measure tracks with low $p_text{T}$, permitting both accessibility to the softer components inside jets as well as measurement of jets with altogether lower pT. This allows ALICE a rare view into QCD and QGP dynamics at pT < 100 GeV/c. We review several recent jet measurements in ALICE using both pp and Pb-Pb collisions at 5.02 TeV and discuss the results.

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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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Nov
29
Mon
CDS @ on-line
Nov 29 @ 2:00 pm – 3:00 pm

Consiglio di Sezione

Dec
23
Thu
CDS @ on-line
Dec 23 @ 2:00 pm – 3:00 pm

Consiglio di Sezione

Other events