Seminář Ústavu teoretické fyziky


Seminář se koná každé úterý v 10:40 v posluchárně ÚTF MFF UK
v 10. patře katedrové budovy v Tróji, V Holešovičách 2, Praha 8


26. února 2019
Crystal growth considerations and improvements for better performing magnetic shape memory alloys
Ross Harvey Colman, Ph.D.
MFF UK
(seminář v angličtině)

5. března 2019
Development of laser-driven X-ray sources for new generation of lasers at Eli Beamlines
Ing. J. Nejdl, Ph.D.
ELI Beamlines Czechia
(seminář v angličtině)

The development of laser-driven X-ray sources using a 20 TW titanium-sapphire laser system have been carried out at PALS research center as a preparatory phase for ELI Beamlines facility that is becoming operational. High-order harmonics from gas targets (HHG), X-ray lasers pumped by transient collisional excitation, plasma X-ray sources, or X-ray sources based on relativistic electron beams have been investigated during last few years here. In this contribution we will present new aspects of those sources as well as the status of their implementation with much more powerful laser drivers at ELI Beamlines. Results of first secondary X-ray sources that have been commissioned in 2018 (HHG Beamline, plasma X-ray source) with commercial 1 kHz laser driver will be also discussed.

12. března 2019
Attosecond Physics at the nanoscale: the ultimate frontier
Dr. Marcelo Ciappina, Ph.D.
ELI Beamlines Czechia
(seminář v angličtině)

Recently two, a priori, different branches of physics have started to merge. One is attosecond physics, that deals with, both theoretical and experimentally, the phenomena that take place when ultrashort laser pulses, with durations ranging from the attosecond to the femtosecond time scale, interact with atoms, molecules or solids. The second branch involves the manipulation and engineering of mesoscopic systems, e.g. solids, metals, dielectrics, with nanometric precision, a scale that was only reached recently. In this way, it is possible to design and build bulk matter samples which pave the way to study light-matte interaction in a completely new regime. In this seminar I’ll summarize the theoretical work we have done to tackle the underlying physics of laser-matter processes driven by spatially and temporal synthesized fields, with a main emphasis in above-threshold ionization (ATI) and high-order harmonics generation (HHG) in atoms and molecules induced by plasmonic fields [1]. At the end of the talk I’ll present a brief summary of other current and future projects.

M. F. Ciappina, et al. Attosecond Physics at the nanoscale, Rep. Prog. Phys 80, 054401 (2017)

https://doi.org/10.1088/1361-6633/aa574e

19. března 2019
A system of linear algebraic equations for the moments of invariant measure of the dynamical system exactly describing Navier-Stokes flow in a bounded volume
RNDr. Martin Macháček, CSc
Astronomical Institute of the Czech Academy of Sciences, Ondřejov
(seminář v angličtině)

We present a rigorous method to find the invariant measure of a dynamical system exactly describing Navier-Stokes turbulence in a bounded volume. In particular we derive a system of linear algebraic equations for long-time mean values of variables such as fluid velocity at a point or higher-order moments of such velocity.

26. března 2019
Black Holes in Quadratic Gravity
Jiří Podolský, Robert Švarc
MFF UK
(seminář v angličtině)

We present a new explicit class of black holes in general quadratic gravity with a cosmological constant. These spherically symmetric Schwarzschild–Bach–(anti-)de Sitter geometries form a three-parameter family determined by the black-hole horizon position, the value of the Bach invariant on the horizon, and the cosmological constant. The tidal effects on free test particles and basic thermodynamic quantities are also determined.

2. dubna 2019
TBA (On "Active galactic nuclei, QSOs, etc")
Prof. Nadia Zakamska
Johns Hopkins University, Baltimore, USA
9. dubna 2019
Vyjímečně v posluchárně T1
TBA (On "Supernovae")
Prof. H. Thomas Janka
MPA Garching
(seminář v angličtině)
16. dubna 2019
High frequency market making - čím umí zaujmout teoretického fyzika?
RNDr. V. Krejčiřík, Ph.D.
Qminers s.r.o. Praha
23. dubna 2019
Seminář se nekoná
30. dubna 2019
TBA
Dr. Molly Peeples
Space Telescope Science Institute, Baltimore, USA
(seminář v angličtině)
7. května 2019
Connections, Torsion and Curvature in Generalized Geometry
doc. Branislav Jurčo, DSc.
Matematický ústav UK
(seminář v angličtině)

Jiří Horáček                                                                                                  Jiří Bičák