of the Institute of Theoretical Physics

- 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)

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