A5009982969- Cosmology and Gravitation Theories
- Laser-Plasma Interactions and Diagnostics
- Black Holes and Theoretical Physics
- Advanced Differential Geometry Research
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Electrodynamics and Casimir Effect
- Nonlinear Photonic Systems
- Geophysics and Sensor Technology
- Astro and Planetary Science
- Laser-induced spectroscopy and plasma
- Dust and Plasma Wave Phenomena
- Laser-Matter Interactions and Applications
- Ionosphere and magnetosphere dynamics
- Stellar, planetary, and galactic studies
- Advanced Fiber Laser Technologies
- Relativity and Gravitational Theory
- Quantum and Classical Electrodynamics
- Nonlinear Waves and Solitons
- Mechanical and Optical Resonators
- Gamma-ray bursts and supernovae
Czech Academy of Sciences
2021-2024
Czech Academy of Sciences, Institute of Physics
2016-2024
Extreme Light Infrastructure Beamlines
2019-2023
Charles University
2006-2012
ELI-Beamlines (ELI-BL), one of the three pillars Extreme Light Infrastructure endeavour, will be in a unique position to perform research high-energy-density-physics (HEDP), plasma physics and ultra-high intensity (UHI) (1022W/cm2) laser–plasma interaction. Recently need for HED laboratory was identified P3 (plasma platform) installation under construction ELI-BL an answer. The 10 PW laser makes possible fundamental topics from high-field new extreme states matter such as radiation-dominated...
Asymptotic behaviour of gravitational and electromagnetic fields exact type D solutions from the large Plebański–Demiański family black hole spacetimes is analysed. The amplitude directional structure radiation evaluated in cases when cosmological constant non-vanishing, so that conformal infinities have either de Sitter-like or anti-de character. In particular, explicit relations between parameters characterize sources (that their mass, electric magnetic charges, NUT parameter, rotational...
The interaction of two counterpropagating electromagnetic waves in a vacuum is analyzed within the framework Heisenberg-Euler formalism quantum electrodynamics. nonlinear wave characterized by steepening, subsequent generation high order harmonics and shock formation with electron--positron pair at front.
In the limit of extremely intense electromagnetic fields Maxwell equations are modified due to photon-photon scattering that makes vacuum refraction index depend on field amplitude. presence waves with small but finite wave numbers behaves as a dispersive medium. We show interplay between polarization and nonlinear effects in interaction counter-propagating can result formation Kadomtsev-Petviashvily solitons and, one-dimension configuration, Korteveg-de-Vries type propagate over large...
We study the interaction of two counter–propagating electromagnetic waves in vacuum Born–Infeld electrodynamics. First we investigate Born case for linearly polarized beams, E · B = 0, i.e., G2=0 (crossed field configuration), which is identical and electrodynamics; subsequently general beams are nonlinearly polarized, G2≠0. In both cases, show that nonlinear equations decouple using self-similar solutions shock wave formation. only exceptional traveling propagate with constant speed do not...
We present and analyze exact gyraton nonexpanding gravitational-wave solutions of algebraic type II on backgrounds which are a direct product two 2-spaces constant curvature, or more general D spacetimes. This family electrovacuum background spacetimes contains the Nariai, anti-Nariai, Pleba\ifmmode \acute{n}\else \'{n}\fi{}ski-Hacyan universes, conformally flat Bertotti-Robinson Minkowski spaces. The given in simple Kundt metric form. They belong to recently discussed class with scalar...
We present and analyze exact solutions of the Einstein-Maxwell equations in higher dimensions which form a large subclass Kundt family spacetimes. assume that cosmological constant may be nonvanishing, matter consists background aligned electromagnetic field an additional pure radiation (gyratonic) with spin. show reduce to set linear on transverse space can solved exactly expressed terms Green functions. thus find explicit gyratonic gravitational fields created by beam null arbitrary...
We present and analyze new exact gyraton solutions of algebraic type II on a background which is static, cylindrically symmetric Melvin universe D. For vanishing electromagnetic field it reduces to previously studied gyratons Minkowski background. demonstrate that the are member more general family Kundt spacetimes. show Einstein equations reduce set mostly linear transverse 2-space we discuss properties polynomial scalar curvature invariants generally non-constant but unaffected by presence...
We study two counter-propagating electromagnetic waves in the vacuum within framework of Heisenberg-Euler formalism quantum electrodynamics. show that non-linear field equations decouple for ordinary wave case and can be solved exactly. solve assuming solution a form Riemann wave. discuss properties nonlinear propagating vacuum, such as steepening, subsequent generation high order harmonics shock formation with electron-positron pair at front.
Using 3D numerical simulations, we show that in the collision of an electron with a counter-propagating laser beam, radial polarization pulse leads to more efficient electron–positron pair production via multiphoton Breit–Wheeler process compared linearly polarized one having same energy, duration, and amplitude. The reason is case radially (or azimuthally) pulse, area strong field region greater than linear one. As consequence, electrons experience sufficient that, turn, results higher...
The generation of gravitational waves by laser accelerated relativistic ions is investigated. piston and light sail models plasma acceleration are considered, analytical expressions for space-time metric perturbation derived. For both models, the dependence wave amplitude on parameters as well spectrum angular distribution examined.
In this work we have found and analyzed several gyraton solutions on various non--trivial backgrounds in the large Kundt class of spacetimes. Namely, direct product spacetimes, Melvin universe its generalization which includes cosmological constant. These are algebraic type II. Also investigated III within gyratons de Sitter spacetime. We generalized spacetimes to higher dimensions. The chapters 4 5 published for first time.
We present and analyze new exact gyraton solutions of algebraic type II on generalized Melvin universe D which admit non-vanishing cosmological constant $\Lambda$. show that it generalizes both, direct product spacetimes. When we set $\Lambda = 0$ get spacetime for $\Sigma 1$ obtain demonstrate the are member Kundt family spacetimes as its subcases. Einstein equations reduce to a transverse 2-space. also discuss polynomial scalar invariants non-constant in general but sub-solutions
We study two counter--propagating electromagnetic waves in the vacuum within framework of Born--Infeld theory quantum electrodynamics. By choosing crossed field case ${\bf E}\cdot{\bf B}=0$, i.e. $\mathfrak{G}^2=0$, Lagrangian reduces to Born Lagrangian, therefore for this special we present which is identical and In paper, show that non--linear equations decouple ordinary wave using self-similar solutions investigate shock steepening. only are exceptional traveling propagate with constant...
We analyze theoretical models of gravitational waves generation in the interaction high intensity laser with matter, namely ablation and piston models. analyse generated linear approximation theory. derive analytical formulas estimates for metric perturbations radiated power waves. Furthermore we investigate characteristics polarization behaviour test particles presence wave which will be important detection.
We study the interaction of two counter–propagating electromagnetic waves in vacuum Born–Infeld electrodynamics. First we investigate Born case for linearly polarized beams, E · B = 0, i. e. G<sup>2</sup> 0 (crossed field configuration), which is identical and electrodynamics; subsequently general beams are nonlinearly polarized, ≠ 0. In both cases, show that nonlinear equations decouple using self-similar solutions shock wave formation. only exceptional travelling propagate with constant...