Relativity Seminar
of the Department of Theoretical Physics


Seminar is held on Tuesdays at 13:10 pm in the lecture room of the Institute
on the 10th floor of the department building at Trója, V Holešovičkách 2, Prague 8


Next seminars:

April 14, 2020
Initial data for closed conformal Killing-Yano 2-forms
doc. Igor Khavkine, PhD.
Department of Algebra, Geometry and Mathematical Physics, Mathematical Institute, Czech Academy of Sciences

The Kerr-NUT-(A)dS family of exactly integrable higher dimensional black hole solutions of Einstein's equations is characterized by the existence of a non-degenerate closed conformal Killing-Yano (cCYK) 2-form. Using an exhaustive search, we identify a family of 2nd order propagation identities for the cCYK equation on 2-forms in n>4 dimensions. These identities allow us to project the cCYK equations onto a spacelike surface and thus characterize the initial data for Einstein's equations whose development admits a cCYK, in analogy with the well-known Killing Initial Data that characterize developments admitting Killing vectors. This is joint work with Alfonso García-Parrado. [arXiv:1912.04752]

April 21, 2020
Gravitational wave techniques across the frequency spectrum
Dr. Deyan Mihaylov
Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Astrophysical and Cosmological Relativity group, Potsdam/Golm
December 31, 2020
TBA (on amplitude methods of QFT)
Dr. Jiří Novotný
IPNP

Previous seminars:

March 3, 2020
Probing fifth forces with the Sun
Dr. Ippocratis Saltas
Central European Institute for Cosmology and Fundamental Physics, Institute of Physics, Czech Academy of Sciences

Generic extensions of General Relativity aiming to explain dark energy typically introduce fifth forces of gravitational origin. In this talk, I will explain how helioseismic observations can provide a powerful and novel tool towards precision constraints of fifth forces, as predicted by general theories for dark energy, and I will discuss the implications for cosmology.

March 10, 2020
On some properties of extended objects in general relativity
Dr. Sajal Mukherjee
Inter-University Centre for Astronomy and Astrophysics, Pune, India

I shall introduce the motion of extended objects with multipole moments occupying a finite size in space. I discuss their various interesting features along with highlighting their distinctive remarks from geodesic orbits. In particular, I shall focus on two particular events: first, orbital dynamics of spinning particles; and second, the multipole interactions between different moments, i.e., monopole, dipole or quadrupole, of the extended test particle and central object. Several other implications involving extended objects will also be mentioned in brief.

April 2, 2020
CURRENTLY NO SEMINARS...
possible online talks will be announced by email
(seminar in Czech language)

Previous semesters:


Jiří Bičák                                                                                                  Oldřich Semerák


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