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Semináře

WZW models and generalized geometry

Pondělí, 11.12.2017 16:00

Martin Roček (C.N. Yang Institute for Theor. Phys., Stony Brook University)

Abstract

I'll review (2,2) superspace and explore how to describe the generalized kahler structure of (2,2) supersymmetric WZW models, presenting surprising new results for SU(3).

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Germanene: graphene's little sister

Úterý, 12.12.2017 10:00

Harold J.W. Zandvliet (Physics of Interfaces and Nanomaterials and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands)

Recently, a few research groups have reported the growth of germanene, a new member of the graphene family [1]. Germanene is in many aspects very similar to graphene, but in contrast to the planar graphene lattice, the germanene honeycomb lattice is slightly buckled and composed of two vertically displaced sub-lattices. Frist principles total energy calculations have revealed that free-standing germanene is a two-dimensional Dirac fermion system, i.e. the electrons behave as massless relativistic particles that are described by the Dirac equation, i.e. the relativistic variant of the...

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On gravitational waves and 2017 Nobel Prize for Physics

Středa, 13.12.2017 15:00

Jiří Chýla (Fyzikální ústav AV ČR)

This year Nobel Prize for Physics has been awarded to three leading scientists from LIGO-VIRGO Collaboration “for decisive contributions to the LIGO detector and the observation of gravitational waves”. I will first recall basic facts about the origin and detection of gravitational waves in general and then discuss in nontechnical terms the construction and amazing sensitivity of LIGO detector as well as the way how the gravitational waves are recorded and presented.

The crucial role of the three Nobel Prize Laureates will be emphasized and all five signals of gravitational waves...

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Star Clusters in the Universe: from the First Stars to the Gould's belt

Úterý, 19.12.2017 15:00

Jan Palouš (Dept. of Galaxies and Planetary Systems, Astronomical Institute, Czech Acad. of Sci.)

Abstract: Hubble Frontier Fields show galaxies deep in the past at red shifts up to 8. This is the time shortly after the reionization of the universe and formation of the first stars. Sizes of star forming clouds are at the level of 10 pc only, close to the dimesions of globular clusters. The early enrichment by yields of stellar evolution and dust is essential ingredient in the explanation of presence of multiple stellar generations in globular clusters. Massive star clusters form also in the local universe and I will speculate how is the early star formation producing...

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