Seminar of Theory of Relativity and Gravitation
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2019-11-15 (Friday)
room 1.40, Pasteura 5 at 11:15 
Jerzy Kijowski (CFT)The essence of gravity. Does "general theory" need generalizations?
The essence of gravity. Does "general theory" need generalizations?
2019-11-14 (Thursday)
room 1.40, Pasteura 5 at 10:15
Sabrina Gonzalez Pasterski (Princeton)Implications of superrotations (joint seminar with KMMF)
The asymptotic symmetry algebra of asymptotically flat spacetimes implies an infinity of conserved charges for 4D scattering which can be neatly recast as 2D conformal Ward identities. We cover recent progress on the proposed 4D/2D dictionary starting from the conformally soft modes that appear as currents and extending our map to a basis for finite energy scattering states.
2019-11-08 (Friday)
room 1.40, Pasteura 5 at 11:15
Sebastian Szybka (UJ)Standing gravitational waves
I will propose a covariant definition of standing gravitational waves.
2019-10-25 (Friday)
room 1.40, Pasteura 5 at 11:15
Ryszard Kerner (Sorbonne Université)New approximation methods for relativistic two-body problem
In this lecture we present an alternative method of calculus of trajectories and motions of test particles in the vicinity of central massive body. Instead of using successive post-Newtonian approximations, we shall perform successive approximations starting from a special exact solution valid in General Relativity: a circular orbit. Linearizing the geodesic deviation equations, we reduce the problem to a series of coupled harmonic oscillators with non-linear right-hand side. Applications to gravitational waves will be shortly discussed.
2019-10-18 (Friday)
room 1.40, Pasteura 5 at 11:15
Jerzy Kowalski-Glikman (UWr, NCBJ)Gravity as a constrained BF theory
In my talk I will present the construction of gravity Lagrangian as a sum of the topological term, the BF theory with (anti-) de Sitter gauge group and a 'constraint' term, explicitly breaking the symmetry down to local Lorentz symmetry. I will then comment on several properties of such defined theory: perturbative expansion around topological vacuum, particle(s) coupling, canonical analysis, and calculation of black hole entropy.
2019-10-11 (Friday)
room 1.40, Pasteura 5 at 11:15
Jakub Mielczarek (Jagiellonian University)From Quantum Gravity to Quantum Computing
During the seminar I will discuss a possibility of simulating Planck scale physics employing current and future quantum computers. I will focus on spin network states spanning a kinematical Hilbert space of Loop Quantum Gravity. A class of simple spin network states which are both physically interesting and convenient from the viewpoint of quantum simulations will be introduced. Based on this, a method of computing gravitational spin foam vertex amplitudes with the use of quantum algorithms will be presented. Exemplary implementations of the method on IBM superconducting quantum computer and emulators of quantum computers will be shown. Furthermore, I will introduce an idea of extracting physical states (solving Hamiltonian constraint) with the use of adiabatic quantum computers.
2019-10-04 (Friday)
room 1.40, Pasteura 5 at 11:15
Jacek Jezierski (KMMF)