Relativity Seminar
of the Institute of Theoretical Physics

fall 2013


Given seminars:

September 24, 2013
Quintessence, phantom and frustrated network of topological defects at late stages of the Universe evolution
Alvina Burgazli
Odessa National University

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.

October 8, 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
October 15, 2013
Near-horizon geometry
Jiří Daněk
ITP
(seminar in Czech language)
October 22, 2013
Interaction of gravitational radiation with matter in high-frequency approximation
Tomáš Tintěra
ITP
(seminar in Czech language)
November 5, 2013
Spinning particles in algebraically special space-times
Milan Šrámek
ITP
(seminar in Czech language)
November 12, 2013
Future stability of cosmological solutions without cosmological constant
dr. Ernesto Nungesser
Trinity College Dublin, School of Mathematics, Ireland
November 19, 2013
Unimodular theory of gravity and its implications in cosmology
dr. Naveen K. Singh
Theory Division, Physical Research Laboratory, Navrangpura, Ahmedabad, India
November 26, 2013
On the zeroth law of thermodynamics in Lanczos-Lovelock gravity
dr. Swastik Bhattacharya
Institute of Mathematical Sciences, Chennai, India
December 3, 2013
New exact solutions in a model of f(R) gravity
dr. Tayebeh Tahamtan
Department of Physics, Eastern Mediterranean University, North Cyprus
December 10, 2013
On black-hole no-hair theorems
dr. Sourav Bhattacharya
Department of Physics, Harish-Chandra Research Institute, Allahabad, India
December 17, 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
January 7, 2014
Einstein-Cartan Theory - Kinematical Hilbert Space
dr. Marián Pilc
ITP
(seminar in Czech language)

Other semesters:


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