Relativistický seminář
Ústavu teoretické fyziky

podzim 2013


Proběhlé semináře:

24. září 2013
Quintessence, phantom and frustrated network of topological defects at late stages of the Universe evolution
Alvina Burgazli
Odessa National University
(seminář v angličtině)

Deep inside the cell of uniformity and at late stages of the evolution, the Universe is filled with inhomogeneously distributed discrete structures (galaxies, groups and clusters of galaxies). Supposing that the Universe contains also the cosmological constant and a perfect fluid with a negative constant equation of state parameter ω (e.g., quintessence, phantom or frustrated network of topological defects), we investigate scalar perturbations of the FRW metrics due to inhomogeneities. Our analysis shows that, to be compatible with the theory of scalar perturbations, this perfect fluid, first, should be clustered and, second, should have the equation of state parameter ω = −1/3 (in particular, this value corresponds to the frustrated network of cosmic strings). Therefore, the frustrated network of domain walls with ω = −2/3 is ruled out. A perfect fluid with ω = −1/3 neither accelerates nor decelerates the Universe. We also obtain the equation for the nonrelativistic gravitational potential created by a system of inhomogeneities. Due to the perfect fluid with ω = −1/3, the physically reasonable solutions take place for flat, open and closed Universes. This perfect fluid is concentrated around the inhomogeneities and results in screening of the gravitational potential.

8. října 2013
Action-angle variables and KAM-theory in general relativity
Daniela Kunst
Fundamental Physics Department, ZARM - Center of Applied Space Technology and Microgravity, University of Bremen
(seminář v angličtině)
15. října 2013
Geometrie v blízkosti horizontu
Jiří Daněk
ÚTF
22. října 2013
Interakce gravitačního záření s látkou ve vysokofrekvenčním přiblížení
Tomáš Tintěra
ÚTF
5. listopadu 2013
Rotující částice v algebraicky speciálních prostoročasech
Milan Šrámek
ÚTF
12. listopadu 2013
Future stability of cosmological solutions without cosmological constant
dr. Ernesto Nungesser
Trinity College Dublin, School of Mathematics, Ireland
(seminář v angličtině)
19. listopadu 2013
Unimodular theory of gravity and its implications in cosmology
dr. Naveen K. Singh
Theory Division, Physical Research Laboratory, Navrangpura, Ahmedabad, India
(seminář v angličtině)
26. listopadu 2013
On the zeroth law of thermodynamics in Lanczos-Lovelock gravity
dr. Swastik Bhattacharya
Institute of Mathematical Sciences, Chennai, India
(seminář v angličtině)
3. prosince 2013
New exact solutions in a model of f(R) gravity
dr. Tayebeh Tahamtan
Department of Physics, Eastern Mediterranean University, North Cyprus
(seminář v angličtině)
10. prosince 2013
On black-hole no-hair theorems
dr. Sourav Bhattacharya
Department of Physics, Harish-Chandra Research Institute, Allahabad, India
(seminář v angličtině)
17. prosince 2013
Dynamics of spinning test bodies in general relativity - center of mass, momentum, and the problem of the representative worldline
dr. Luis Filipe Costa
Department of Mathematics, Institute of Advanced Technology, University of Lisboa, Portugal
(seminář v angličtině)
7. ledna 2014
Einstein-Cartan Theory - Kinematical Hilbert Space
dr. Marián Pilc
ÚTF

Další ročníky:


© 15. prosince 2014; Oldřich Semerák <semerak@mbox.troja.mff.cuni.cz>
© 6. října 2016; vygenerováno pomocí aplikace seminar, verze 2.04 (2003-09-02); správce <Pavel.Krtous@mff.cuni.cz>