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Seminar

Searching for dark matter with MAGIC and other gamma-ray instruments

 

dr. Daniel Kerszberg

Institut de Fisica d’ Altes Energies, Barcelona
 
 
Mjesto i vrijeme:

Utorak, 8. rujna 2021. u 12 sati
Predavaonica O-029
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka
Poveznica: Google Meet
 


Sažetak:
 

MAGIC is a stereoscopic system of two Imaging Atmospheric Cherenkov Telescopes located on the Canary island of La Palma that detects gamma rays from ~30 GeV to ~100 TeV. Observations by MAGIC allow us to probe, among others, various fundamental physics topics. One of these topics is the nature and the distribution of dark matter. MAGIC is actively conducting searches for gamma-ray signals from WIMP dark matter annihilation and decay towards various targets. I will first present the state of the art of dark matter analyses using gamma-ray instruments with a focus on Cherenkov telescopes. Then I will present recent results. In particular I will cover the search for promising line emission in the Galactic Centre with MAGIC, and from a combined analysis of dwarf spheroidal galaxies observed with five different gamma-ray experiments: Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS.

Controlling the transverse flow of light in optical microcavities for photon BEC experiments

 

Mario Vretenar

University of Twente
 
 
Mjesto i vrijeme:

Utorak, 1. rujna 2021. u 12 sati
Predavaonica O-029
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka
Poveznica: Google Meet
 


Sažetak:
 

Controlling the flow of light is a fundamental requirement for the realization of complex photonic matter and simulations with light. Two techniques for controlling the transverse motion of photons in high-finesse optical microresonators are presented: permanent nanostructuring of the surface of dielectric mirrors via direct laser writing, and in-operation tuning based on a thermo-responsive polymer enclosed within the microresonator. In both methods, a laser beam locally heats an absorptive Si layer situated between the dielectric stack and the substrate. For high enough optical powers this permanently expands the Si layer, allowing for the creation of smooth surface profiles with heights of up to 1 μm with a resolution better than 0.1 nm. With lower optical powers in an assembled microresonator, the heat is transferred into the thermo-responsive polymer resulting in a fully tunable trapping potential. With these techniques at hand, we experimentally demonstrate tunable tunneling between two photon Bose-Einstein condensates, realizing an optical analogue of a 0,π-Josephson junction, which can act as a building block for an ultrafast all-optical spin glass simulator. Furthermore, we investigate the Bose-Einstein condensation of a photonic Bose gas in an environment with controlled dissipation and feedback, by realizing a potential landscape that effectively acts as a Mach-Zehnder interferometer.

Modeliranje primarne proizvodnje

 

doc. dr. sc. Žarko Kovač

Sveučilište u Splitu, Prirodoslovno-matematički fakultet
 
 
Mjesto i vrijeme:

Utorak, 13. srpnja 2021. u 10 sati
Predavaonica O-029
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka
Poveznica: Google Meet
 


Sažetak:
 

Fitoplankton je naziv za slobodno plutajuće mikroskopske autotrofne organizme koji danas nastanjuju ocean, odnosno tri četvrtine površine našeg planeta. Fitoplanktonska primarna proizvodnja je temelj pelagičkog ekosustava i regulira energiju raspoloživu višim trofičkim razinama. Po količini asimiliranog ugljika na godišnjoj skali fitoplanktonska primarna proizvodnja je usporediva s primarnom proizvodnjom kopnenih biljaka. Visoki protok ugljika kroz fitoplanktonske populacije čini fitoplankton regulatorom tog istog okoliša na duljim vremenskim skalama. Istraživanje fitoplanktonske primarne proizvodnje se tradicionalno odvijalo kroz dva znanstvena pristupa: in situ i in vitro. Postoji, međutim, i treći pristup za istraživanje fitoplanktonske dinamike: matematički modeli. Računalna primjena tih modela tvori takozvani in silico pristup. Danas je modeliranje primarne proizvodnje disciplina s više od pola stoljeća tradicije. Strogo govoreći, modeliranje primarne proizvodnje se odnosi na bio-optičke modele asimilacije ugljika od strane fitoplanktona. Teorija primarne proizvodnje je izražena jezikom teorije dinamičkih sustava i čini spregu fizikalne i biološke teorije. Ovdje će biti izložen kratki povijesni pregled discipline, odnos modela i mjerenja, nove spoznaje te otvoreni problemi u ovom polju.

The magnetic properties of the muon: a window on new physics beyond the Standard Model

 

prof. Giovanni Cantatore

Sveučilište u Trstu
 
 
Mjesto i vrijeme:

Ponedjeljak, 5. srpnja 2021. u 15:30
Predavaonica O-029
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka
Poveznica: Google Meet
 


Sažetak:
 

The "Muon g-2" experiment now running at Fermilab (Chicago, USA) has recently announced a new measurement of the gyromagnetic anomaly of the muon, obtained with unprecedented precision. It presents fresh evidence of the existence of novel physical phenomena not included in the Standard Model, the reference theory on the subatomic world. The latest experimental results by Muon g-2 show a discrepancy with respect to Standard Model based calculations at the level of 3.3 standard deviations (sigma). This measurement is compatible with a previous experiment, and the combination brings the statistical significance of the discrepancy to 4.2 sigma, just short of the customary 5 sigma required to claim a discovery.
One European leg of the collaboration, led by INFN, has contributed to Muon g-2 since the beginning by, among other things, designing and building a sophisticated laser calibration system for the calorimeters, which represents a state of the art device surpassing systems previously in use. This device has been a key ingredient of the fantastic precision achieved by Muon g-2. After a brief introduction to the experiment and to the relevance of the result, we will discuss in greater detail the laser calibration system and its importance. 

From higher spin symmetries to Moyal-product based gauge theories

 

Mateo Paulišić

Sveučilište u Rijeci, Odjel za fiziku
 
 
Mjesto i vrijeme:

Četvrtak, 17. lipnja 2021. u 14 sati
Poveznica: Google Meet 
 


Sažetak:
 

Fundamental interactions that are very well known, such as electromagnetism or gravity, are very well described in terms of fields of spin 1 and 2. Curiosity naturally leads physicists to ponder what the deal is with fields of higher spin? After all, there remain unanswered questions with the quantum description of gravity or high energy behavior of quantum field theories, and hints or answers might be found in unexpected places.
While free fields of higher spin can be described in simple terms and in much detail, a lot is still unknown about interacting theories, with traditional ways of looking for them still having to produce a satisfying answer.
In this seminar, after introducing and reviewing the context, I will describe a novel approach, based on utilizing symmetries of fields of matter in an unconventional way. This approach relies on a few crucial ingredients discovered fairly recently. The obtained construction is a Yang-Mills like theory defined over a symplectic manifold, with a non-commutative structure encoded with the Moyal product. It is perturbatively stable and possesses a number of interesting properties. 

 
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