Seminar of Theory of Relativity and Gravitation
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2018-01-26 (Friday)
room 1.40, Pasteura 5 at 11:15 
Andrzej Rostworowski (UJ)Towards a theory of nonlinear gravitational waves: a systematic approach to nonlinear gravitational perturbations in vacuum
I will present a systematic and robust approach to nonlinear gravitational perturbations of vacuum spacetimes. In particular, I will show that at each order of perturbation expansion, the system of perturbative Einstein equations can be reduced to two (for each gravitational mode in 3+1 dimensions on which the study will be focused) scalar wave equations, and the metric perturbations can be explicitly obtained, once the solutions to these scalar wave equations are known. The talk will be based on a recent paper Phys. Rev. D96, 124026 [https://journals.aps.org/prd/abstract/10.1103/PhysRevD.96.124026], [http://arxiv.org/abs/1705.02258].
2017-12-15 (Friday)
room 1.40, Pasteura 5 at 11:15
Jerzy Kijowski (CFT PAN, Warszawa)Theory of radiation: null infinity and Trautman-Bondi energy
2017-12-08 (Friday)
room 1.40, Pasteura 5 at 11:15
Jacek Jezierski (IFT UW)Quasi-local Hamiltonian - four decades of Kijowski's formula
2017-12-01 (Friday)
room 1.40, Pasteura 5 at 11:15
Marek Szczepańczyk (Embry-Riddle Aeronautical University)Gravitational Waves form Core-Collapse Supernovae
2017-11-24 (Friday)
room 1.40, Pasteura 5 at 11:15
Patryk Mach (UJ, Kraków)General relativistic disks around black holes: effects of selfgravity
2017-11-17 (Friday)
room 1.40, Pasteura 5 at 11:15
Tomasz Pawłowski (CFT PAN, Warszawa)Anisotropic universe in loop quantum cosmology
2017-11-10 (Friday)
room 1.40, Pasteura 5 at 11:15
Yongge Ma (Beijing Normal University, Chiny)Loop quantum Brans-Dicke gravity and its cosmological model
2017-10-27 (Friday)
room 1.40, Pasteura 5 at 11:15
Denis Dobkowski-Ryłko (IFT UW)Geometric Characterization of the Kerr-de Sitter Horizon
2017-10-20 (Friday)
room 1.40, Pasteura 5 at 11:15
Dorota Gondek-Rosińska (Uniwersytet Zielonogórski)Gravitational wave astronomy
2017-10-13 (Friday)
room 1.40, Pasteura 5 at 11:15
Jan Kwapisz (CENT UW)Conformal Standard Model and Inflation
We present a possible inflation scenario as a consequence of non-minimal gravitational couplings in the Conformal Standard Model. That model consists, in comparison to the SM, of additional right-chiral neutrinos and a complex scalar sextet which, in distinction to the Higgs boson, is not coupled to the SM particles. The inflation is driven by two non-minimally coupled fields. One of those is the SU(2) Higgs-like doublet and the second is associated with the trace of the sextet. These two fields are related to the Higgs particle and “shadow”, heavier Higgs via the mass mixing matrix. Since these type of models, with non-minimal coupling(s), can match the observational data related to inflation, they are of high interest. For this particular model, as it turned out, the tensor to scalar ratio and spectral tilt match the current data for a wide range of parameters. The unitary evolution violation above M_P/√ξ will be also investigated and a possible, natural within CSM, solution will be presented.