Środowe seminaria Instytutu Fizyki
time and place:
- Wednesday at 12:30 p.m.,
- room 106, in the Faculty of Physics (1. floor)
convener:
Future Institute Seminars will be announced soon
Samuel Barroso Bellido
Institute of Physics, University of Szczecin
„What could a pair of universes tell us about the multiverse?”
prof. Krzysztof Sacha
Institute of Theoretical Physics, Jagiellonian University
„Time Crystal Phenomena”
Mgr. Paolo Cremonese
Institute of Physics – University of Szczecin
„Wave-optics in Gravitational Waves lensed events”
prof. Raffaele-Tito D’Agnolo
Institut de Physique Théorique, Université Paris Saclay, CEA, FRANCE
„Cosmological Selection of the Weak Scale”
Mgr. Roberto Caroli
Institute of Physics – University of Szczecin
„The new framework of Ricci Cosmology and its viability”
Mgr. Ziming Liu
MIT & IAIFI, USA
„Auto-discovering conservation laws and symmetries with machine learning”
Dr. Giulia Rubino
Royal Society-Newton International Post-Doctoral Fellow at the Bristol Centre for Nanoscience & Quantum Information (UK)
„Quantum superposition of thermodynamic evolutions with opposing time’s arrows”
Dr. Rakesh Dubey
University of Szczecin
„Revisiting the fusion-fission mechanism in actinide region”
Prof. Dr. Peter G. Thirolf
Ludwig-Maximilians-Universität München, Garching, Germany
„The 229Th Isomer: Doorway to a Nuclear Clock”
Dr. Chiara Marletto
University of Oxford
„Witnesses of non-classicality beyond quantum theory”
Prof. Jen-Chieh Peng
University of Illinois at Urbana-Champaign
“Exploring the Nucleon Sea with Lepton-Pair Production”
Prof. Tamás Csörgo
Wigner Research Centre for Physics, Budapest & MATE Institute of Technology, Károly Róbert Campus, Gyöngyös, Hungary & CERN
“Evidence of Odderon-exchange from scaling properties of elastic scattering at TeV energies”
Prof. Rashid Nazmitdinov
BLTP, Joint Institute for Nuclear Research, Dubna, Russia
“Cyclic symmetry and self-organization of charged particles in circular geometry”
Dr. Richard Howl
University of Hong Kong & Oxford University
“Non-Gaussianity as a signature of a quantum theory of gravity in tabletop tests”
Dr. Jan Hermann
Department of Mathematics and Computer Science, Freie Universität Berlin & Machine Learning Group, Technische Universität Berlin.
Solving the electronic Schrödinger equation with deep learning
Prof. Gwendal Fève
Laboratoire de Physique de l’Ecole Normale Supérieure, Université PSL, CNRS, Sorbonne Université, Université de Paris.
Fractional statistics of anyons in a mesoscopic collider
Prof. Attila Krasznahorkay
Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki) and CERN.
New results supporting the existence of the X17particle
dr. Maciek Wielgus
Black Hole Initiative fellow @ Harvard-Smithsonian Center for Astrophysics
“Monitoring M87* in 2009-2017 with the EHT”
Abstract: The Event Horizon Telescope (EHT) has recently delivered the first resolved images of M87*, the supermassive black hole in the center of the M87 galaxy. These images were produced using 230 GHz observations performed in 2017 April. Additional observations are required to investigate the persistence of the primary image feature—a ring with azimuthal brightness asymmetry—and to quantify the image variability on event horizon scales. To address this need, we analyze M87* data collected with prototype EHT arrays in 2009, 2011, 2012, and 2013. While these observations do not contain enough information to produce images, they are sufficient to constrain simple geometric models. We develop a modeling approach based on the framework utilized for the 2017 EHT data analysis and validate our procedures using synthetic data. Applying the same approach to the observational data sets, we find the M87* morphology in 2009–2017 to be consistent with a persistent asymmetric ring of ~40 μas diameter. The position angle of the peak intensity varies in time. In particular, we find a significant difference between the position angle measured in 2013 and 2017. These variations are in broad agreement with predictions of a subset of general relativistic magnetohydrodynamic simulations. We show that quantifying the variability across multiple observational epochs has the potential to constrain the physical properties of the source, such as the accretion state or the black hole spin.
Dr. Vincenzo Salzano
Extended Theories of Gravity in clusters of galaxies
Abstract: After a (necessarily) short introduction about why and how General Relativity, assumed as the established consensus gravity theory, should be modified/extended, we will discuss the constraints we obtained for a particular class of Extended Theory of Gravity (technically defined as “Beyond Horndeski” and “Vainshtein-breaking” theory), using data from clusters of galaxies, both from X-ray observations and from gravitational lensing events.
Prof. Dr. Waclaw Gudowski (Royal Institute of Technology KTH, Stockholm and National Centre for Nuclear Research, Swierk)
Nuclear Power – a vital component of environmental friendly energy supply mix in XXI century – new reactors, new solutions
Abstract:
Nuclear power has experienced an unprecedented, stormy development in 60’s and 70’s of the last century and then stagnated badly and became a very controversial energy source since the TMI accident (1979), then the Chernobyl sever accident (1986) and recently the Fukushima Daichi accident. In a shadow of those accidents a public fear related to use of nuclear power has grown making very difficult if not impossible rational discussion on future energy strategies. Moreover, in many countries, including Sweden, nuclear power became unwillingly and unnecessarily a very hot political issue. In many emotional public debates it is frequently forgotten that nuclear power is the most modern energy technology and it is one of very few options to save our planet from very serious man-made disasters like climate changes, energy related poverty etc.
We scientists and experts in nuclear field have many „sines” to be blamed for. We neglected serious discussions within the expert communities, we neglected respectful and serious public communications and last but not least we neglected the fact that public has right to fear technology, which is not easy to understand and to master.
Strangely enough many nations, which built their wealth on utilization of nuclear power and high energy consumption based on very rational and smart decisions of previous generations, are turning now against the nuclear power with not very rational and technically sound arguments, forgetting that secure and environmental friendly energy supply is one of the pillars of democratic societies – nuclear is and is going to be a very important and significant part of a modern energy mix.
New reactor concepts are under development: so called Generation IV reactors (Gen IV), small modular reactors (SMR) and many other advanced and interesting reactor types including a Dual Fluid Reactor (DFR) concept with some roots here in Szczecin.
The presentation will review the most interesting reactor concepts and will conclude with some arguments why Poland should „go nuclear”.
Filip Pratnicki
Unoccupied natural orbitals in ground states of two-electron atoms and molecules
Abstract: Proving the existence of unoccupied natural orbitals (UNOs), i.e. natural orbitals with vanishing occupation numbers, holds the potential of having a considerable impact on the electronic structure formalisms such as density matrix functional theory and extended Koopmans theorem. In general, the existence of UNOs in Coulombic systems is difficult to establish. However their presence in two-electron species is signaled by the transitions between different sign patterns of the natural amplitudes {λnl}.During the talk the results of recent calculations on the benchmark-quality natural amplitudes for the total of 600 natural orbitals pertaining to the ground state of the helium atom will be presented. I will describe the method of regularized Krylov sequences of Nakatsuji that is capable of achieving highly accurate wavefunction approximation and explain how it can be employed for calculations of the natural orbitals and the corresponding natural amplitudes. The numerical trends observed in the present calculations strongly suggest that, contrary to previous claims, in the case of the ground state of the helium atom the only positive-valued natural amplitude is that pertaining to the strongly occupied orbital, i.e., λ10. The relevance of this finding to the existence of unoccupied natural orbitals pertaining to the ground state wavefunction of the H2 molecule will be discussed.
Mariusz Dabrowski
Classical and quantum multiverses
Abstract: I will explain how the idea of varying constants can lead to toy cyclic models of the parallel universes (the multiverse) with different evolution of the fundamental constants and same geometry using the condition that the total entropy of the system does not decrease. Then, I will describe how to use the second quantization method which on the level of the quantum universe is granted the so-called third quantization to form quantum the multiverse which is a quantum entangled system (in a similar way as quantum computers) on the base of these classical models. The entanglement quantities (entropy, temperature) can be the measures of the “quantumness” of some classical regimes of the universe evolution and also the tools to observationally measure the multiverse signals.
Edyta Podlewska-Gaca
Determination of physical parameters of asteroids.
Abstract:
Small bodies in the Solar System although numerous, still remain poorly understood. The easiest way to study asteroids are photometric observations. The lightcurves can give us a lot of information about the fundamental physical parameters such as rotation period, spin axis orientation, shape and volume which with known mass gives also density. The calculated models of asteroids, in turn are essential for testing the scenarios of the Solar system formation and evolution. In my talk I will describe the methods and present first results of determining of physical properties of asteroids obtained in framework of the projects H2020: „Smal Bodies Near And Far” and in Large Program on ESO VLT telescope.
© Copyright - Uniwersytet Szczeciński