Seminars

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Our group hosts several different weekly activities. We have a series of regular seminars on Wednesdays at 15:00 in Room S named High Energy Theory Seminars (orange in the calendar), replaced by Theory Colloquia (yellow) once per month.
We also have informal discussions on Tuesdays in Room R, alternating between the Pheno-Coffee (pink) and the Theory-lunch (green).

If you have iCal, you can have our seminars added automatically to your calendars by subscribing (⌥⌘S) to the address http://active.pd.infn.it/g4/jccal.php.


Calendar of next month's seminars



High Energy Theory Seminars and Theory Colloquia

Date Speaker
(Affiliation)
Title Room
&Time
17-01-18
Wednesday
V. Reys
Milano Bicocca U.
Localization in conformal supergravity and black hole entropy
Abstract
In this talk I will discuss known results and work in progress regarding the exact, non-perturbative entropy of certain supersymmetric black holes. This quantity can be computed within the Quantum Entropy Function formalism, by means of supersymmetric localization in the supergravity theory of which the black hole is a solution. To effect localization it is most convenient to use an off-shell Euclidean framework. To this aim, I will start by reviewing the construction of 4d, N=2 Euclidean conformal supergravity and briefly discuss 1/2-BPS black hole solutions in this theory. I will then explain how to obtain their exact quantum entropy by localization of the Quantum Entropy Function. To provide some concrete examples, I will review the results obtained previously when the black hole is embedded as a 1/8-BPS black hole of N=8 supergravity, or as a 1/4-BPS black hole of N=4 supergravity. Lastly, I will discuss how this strategy can also be used to analyze asymptotically AdS black hole solutions of 4d, N=2, $U(1)^4$ gauged supergravity.
Aula S
15:00
24-01-18
Wednesday
G. Colangelo
Bern U.
TBAAula S
15:00
31-01-18
Wednesday
A. Thamm
CERN
Collider Probes of Axion-Like Particles
Abstract
Axion-like particles (ALPs), which are gauge-singlets under the Standard Model (SM), appear in many well-motivated extensions of the SM. Describing the interactions of ALPs with SM fields by means of an effective Lagrangian, we discuss ALP decays into SM particles at one-loop order, including for the first time a calculation of the a→πππ decay rates for ALP masses below a few GeV. We argue that, if the ALP couples to at least some SM particles with couplings of order (0.01−1)TeV−1, its mass must be above 1 MeV. Taking into account the possibility of a macroscopic ALP decay length, we show that large regions of so far unconstrained parameter space can be explored by searches for the exotic, on-shell Higgs and Z decays h→Za, h→aa and Z→γa in Run-2 of the LHC with an integrated luminosity of 300 fb−1. This includes the parameter space in which ALPs can explain the anomalous magnetic moment of the muon. Considering subsequent ALP decays into photons and charged leptons, we show that the LHC provides unprecedented sensitivity to the ALP--photon and ALP--lepton couplings in the mass region above a few MeV, even if the relevant ALP couplings are loop suppressed and the a→γγ and a→ℓ+ℓ− branching ratios are significantly less than~1. We also discuss constraints on the ALP parameter space from electroweak precision tests
Aula S
15:00
07-02-18
Wednesday
D. Racco
Geneva U.
A Cosmological Signature of the Standard Model Higgs Vacuum Instability: Primordial Black Holes as Dark Matter
Abstract
For the current central values of the Higgs and top masses, the Standard Model Higgs potential develops an instability at a scale of the order of 1011 GeV. We show that a cosmological signature of such instability could be dark matter in the form of primordial black holes seeded by Higgs fluctuations during inflation. The existence of dark matter might not require physics beyond the Standard Model
Aula S
15:00
14-02-18
Wednesday
TBA
Aula S
15:00

Pheno Coffees

Date Speaker Title Room
&Time
30-01-2018
Tuesday
Pierpaolo MastroliaA walk through Feynman Diagrams Calculations (based on arXiv:1609.08987)Aula R
14:00
13-02-2018
Tuesday
Francesco D'EramoOn the DAMPE Positron ExcessAula R
14:00

Theory Lunch

Date Speaker Title Room
&Time
23-01-2018
Tuesday
Seyed Morteza Hosseini Topologically twisted index and black hole entropy Aula R
14:00

Other Events

Date Speaker Title Room
&Time