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)

- current semester
- fall 2023
- spring 2023
- fall 2022
- spring 2022
- fall 2021
- spring 2021
- fall 2020
- spring 2020
- fall 2019
- spring 2019
- fall 2018
- spring 2018
- fall 2017
- spring 2017
- fall 2016
- spring 2016
- fall 2015
- spring 2015
- fall 2014
- spring 2014
- fall 2013
- spring 2013
- fall 2012
- spring 2012
- fall 2011
- spring 2011
- fall 2010
- spring 2010
- fall 2009
- spring 2009
- fall 2008
- spring 2008
- fall 2007
- spring 2007
- fall 2006
- spring 2006
- fall 2005
- spring 2005
- fall 2004
- spring 2004
- fall 2003
- spring 2003
- spring 2002
- fall 2001
- spring 2001
- fall 2000
- spring 2000
- fall 1999
- spring 1999
- fall 1998
- spring 1998
- fall 1997

© December 15, 2014; Oldřich Semerák

© February 12, 2024; generated by application