Wydział Fizyki UW > Badania > Seminaria i konwersatoria > Konwersatorium im. Leopolda Infelda (do roku 2017/18)

Konwersatorium im. Leopolda Infelda

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Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Prof. Zackaria Chacko (University of Maryland)

Current Perspectives on Dark Matter

It is known from observations that about 80% of the matter in the universe is composed of some form of non-luminous dark matter. However, the nature of the particles of which dark matter is composed remains a mystery. In this talk, I first explain the observational evidence for the existence of dark matter. I then consider some of the proposals that have been put forward to explain the nature of dark matter, and their implications for experiment. The primary focus is on recent developments that go beyond the framework of single component dark sectors.

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Prof. dr hab. Kazimierz Rzążewski (CFT PAN)

Bose Einstein condensation and classical fields

A dilute Bose gas of neutral atoms was condensed in 1995. The experiments and the theory hasachieved a lot since the first experiment. The theoretical description of the ultra cold Bose atnonzero temperatures is still a challenge. More than a decade ago we have formulated a relativelysimple method of describing properties and processes involving such a gas. I will explain thisapproximate methods and present its several successful applications.

Zapraszamy do sali nr 0.03 (parter) przy ul. Pasteura 5 o godzinie 16:30

prof. dr hab. Andrzej K. Wróblewski (Instytut Fizyki Doświadczalnej Wydziału Fizyki Uniwersytetu Warszawskiego)

Bilans stulecia

Streszczenie:

Wobec braku możliwości podróży w czasie nie mogę powędrować w przyszłość, aby z odpowiedniej perspektywy czasowej ocenić minione stulecie 1915-2015 w fizyce w Polsce. Mogę jednak spróbować przemieszczenia wirtualnego i pokusić się tym sposobem o zrobienie bilansu tego stulecia. Przedstawię m.in. moje typy w trzech kategoriach:
a) 10 najbardziej doniosłych wydarzeń w fizyce w Polsce,
b) 10 fizyków, którzy wnieśli największy wkład w organizację i działania środowiska fizyków w Polsce,
c) 10 najwybitniejszych osiągnięć fizyków polskich, które zajęły trwałe miejsce w historii fizyki.

Referat zostanie wygłoszony w ramach wspólnego posiedzenia konwersatoriów im. J. Pniewskiego i L. Infelda.

Zapraszamy!

Jan Kalinowski, Jerzy Kijowski, Czesław Radzewicz, Wojciech Satuła, Janusz Skalski

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Prof. dr hab. Piotr Jaranowski (Faculty of Physics, University of Białystok, Poland)

The first direct detection of gravitational waves

On September 14, 2015 the two LIGO detectors simultaneously observed a gravitational-wave signal coming from the merger of two stellar-mass black holes.
After very quick look at the history of gravitational-wave research, the observation as well as detectors, search algorithms, and source properties will be described in more detail.
The contribution of the Polish POLGRAW group to the discovery will be presented.

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Prof. dr hab. Józef Spałek* (Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagielloński, Kraków)

Universal properties of high temperature superconductors from real space pairing

In my talk I present principal universal properties of high temperature (cuprate) superconductors and show subsequently how the theoretical model based on pairing in real space can explain those results in a quantitative manner. The emphasis in on strong electronic correlations among the relevant electrons, treated within the full Gutzwiller wave - function solution.

*) In cooperation with Michał Zegrodnik (ACMIN AGH) and Jan Kaczmarczyk (Institute of Science & Technology, Austria). Work was supported by Grant MAESTRO (NCN) No. DEC-2012/04/ST3/00342.

Serdecznie zapraszamy,
Jan Kalinowski
Jerzy Kijowski
Wojciech Satuła
Michał Spaliński

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Prof. dr hab. Piotr Pragacz (Instytut Matematyczny PAN)

Życie i dzieło Alexandra Grothendiecka

Opowiemy o Alexandrze Grothendiecku (1928-2014) jednym z największych matematyków 20. wieku. Odmienił on nasze spojrzenie na matematykę. Jego szczególne dokonania związane są z analizą funkcjonalną, ale przede wszystkim z geometrią algebraiczną.

Zapraszamy do sali nr 0.03 (parter) przy ul. Pasteura 5 o godzinie 16:30

prof. dr hab. Tomasz Bulik (Obserwatorium Astronomiczne Uniwersytetu Warszawskiego)

GW150914: pierwsza bezpośrednia detekcja fal grawitacyjnych

Streszczenie:

Fale grawitacyjne zostały wykryte przez detektory LIGO, co stanowi początek astronomii fal grawitacyjnych.Przedstawię szczegóły tego odkrycia, i własności wykrytego układu podwójnego czarnych dziur. Omówię konsekwencje fizyczne i astrofizyczne tej detekcji.

Referat zostanie wygłoszony w ramach wspólnego posiedzenia konwersatoriów im. J. Pniewskiego i L. Infelda.

Zapraszamy!

Jan Kalinowski, Jerzy Kijowski, Czesław Radzewicz, Wojciech Satuła, Janusz Skalski

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Professor Dieter Vollhardt (Center for Electronic Correlations and Magnetism, University of Augsburg)

Surprising effects of electronic correlations in solids

In interacting many-particle systems such as electrons in solids, the concept of a single, elementary particle loses its meaning. In spite of well-known interactions between the particles completely new and surprising phenomena such as phase transitions can emerge. In this context the term "electronic correlations" plays an important role. It refers to effects of the interaction between the particles which cannot be explained by viewing the interaction as a mean field. Electronic correlations influence the electronic and magnetic properties of matter strongly. In my talk I will present a basic introduction into the concepts of correlated electronic systems. In particular, I will describe recent theoretical progress which allows one to go beyond the investigation of simple models and thereby explain properties of correlated electron materials.

Zapraszamy do sali 0.03, ul. Pasteura 5 o godzinie 15:30

Professor David Gross (KITP, Univerisity of California Santa Barbara, Nobel Prize 2004)

The Enduring Legacy of Albert Einstein

Zapraszamy do sali nr 0.03 (parter) przy ul. Pasteura 5 o godzinie 16:30

dr Justyna Łagoda, prof. Ewa Rondio (National Centre for Nuclear Research)

Nobel 2015 in physics: Neutrinos oscillate, so they have mass!

Streszczenie:

The seminar will start from the landscape in neutrino physics before results from Super Kamiokande and SNO experiments. The measurements, recently honored with the Nobel prize, and their interpretation will be presented in the first part. The second part of the presentation will show the continuation of the neutrino oscillation studies up to most recent result and remaining questions.

Referat zostanie wygłoszony w ramach wspólnego posiedzenia konwersatoriów im. J. Pniewskiego i L. Infelda.

Zapraszamy!

Jan Kalinowski, Jerzy Kijowski, Czesław Radzewicz, Wojciech Satuła, Janusz Skalski

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Prof. dr hab. Iwo Białynicki-Birula (Center for Theoretical Physics PAN)

150 years of Maxwell’s equations

In my lecture I will try to convince the audience that 150 years after their discovery Maxwell’s equations are still worth investigating and they continue to reveal their amazing properties.

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Professor Jeroen van den Brink (Institute for Theoretical Solid State Physics, IFW Dresden, Germany and Department of Physics, TU Dresden, Germany)

Spin-orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3

When viewed as an elementary particle, the electron has spin and charge. When binding to the atomic nucleus, it also acquires an angular momentum quantum number corresponding to the quantized atomic orbital it occupies. Even if electrons in solids form bands and delocalize from the nuclei, in Mott insulators they retain their three fundamental quantum numbers: spin, charge and orbital. The hallmark of one-dimensional physics is a breaking up of the elementary electron into its separate degrees of freedom. The separation of the electron into independent quasi-particles that carry either spin (spinons) or charge (holons) was first observed fifteen years ago. Here we report observation of the separation of the orbital degree of freedom (orbiton) using resonant inelastic X-ray scattering on the one-dimensional Mott insulator Sr2CuO3. We resolve an orbiton separating itself from spinons and propagating through the lattice as a distinct quasi-particle with a substantial dispersion in energy over momentum, of about 0.2 electronvolts, over nearly one Brillouin zone [1].

[1] J. Schlappa, K. Wohlfeld, K. J. Zhou, M. Mourigal, M. W. Haverkort, V. N. Strocov, L. Hozoi, C. Monney, S. Nishimoto, S. Singh, A. Revcolevschi, J.-S. Caux, L. Patthey, H. M. Rønnow, Jeroen van den Brink and T. Schmitt, Nature 485, 82 (2012).

Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 15:30

Professor Simon Benjamin (University of Oxford)

Controlling the quantum world -- are we ready to create quantum technologies?

The effort to develop practical quantum technology is ramping up worldwide, with several governments (including the UK) recently announcing hundreds of millions of dollars worth of investment. Is thispremature? Or are we now sure that complex quantum systems can be adequately controlled, and sufficiently scaled, that they can be useful? I will ague for a "yes" by reviewing recent achievements in experiments,architecture theory and applications. My talk will include a graphical (non-mathematical) explanation of our best ideas for spotting errors in a quantum computer's memory -- even though we are not allowed to look atit! Audience members who bring a laptop with Chrome or Safari browsers will be able to try a simulation where they control a quantum memory themselves.