Conferences 





Contact 
Chair of Theory of
Relativity and Gravitation,
Institute of Theoretical Physics,
University of Warsaw
ul. Pasteura 5,
02093 Warsaw, Poland
Phone: (+48 22) 55 32 949
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List of talks given by members of the Department of the Theory of Relativity and Gravitation in a reverse chronological order.
11th Central European Relativity Seminar
Eryk Buk
Axisymmetric, isolated horizon in the presence of cosmological constant
Maciej Kolanowski
Charges in asymptotically de Sitter spacetimes
Gioele Botta
Computable Loop Quantum Gravity
Paweł Caputa
Anna Nakonieczna
Łukasz Nakonieczny
10th Central European Relativity Seminar
Maciej Kolanowski
Extremal horizons stationary to the second order: New constraints
Maciej Ossowski
Nonsingular KerrNUTde Sitter spacetimes
International Loop Quantum Gravity Seminar 2020
Maciej Ossowski
KerrNUTdS spacetimes that admit nonsingular horizons
Maciej Kolanowski
Lost in translation  energy in the de Sitter universe
International Loop Quantum Gravity Seminar  Fall 2019
Wojciech Kamiński
Volume operator in LQC
The 6^{th} Conference of the Polish Society on Relativity
Denis DobkowskiRyłko
The solution to the Petrov type D equation on the nontrivial bundle topology and its embedability
Maciej Kolanowski
Antievaporation of Schwarzschildde Sitter black hole revisited
Anna Nakonieczna
Multidimensional dynamics of the branedilaton black hole system
Conference on the occasion of Jerzy Lewandowski's 60^{th} birthday (Jurekfest), September 1620, 2019, Warsaw, Poland
Denis DobkowskiRyłko
Isolated horizons, near horizon geometries and the Petrov type D equation
Maciej Kisielowski
On the relation between loop quantum gravity and spinfoam models
Jacek Tafel
The Penrose inequality for the perturbed Schwarzschild initial data
Twistors and Loops meeting in Marseille, September 26, 2019, Marseille, France
Jerzy Lewandowski
The quantum states and operators of the canonical LQG
2019 Annual Meeting of the Chinese Physical Society, Division of Gravitation and Relativistic Astrophysics, July 1419, 2019, Guiyang, China
Jerzy Lewandowski
Canonical and covariant LQG
22nd International Conference on General Relativiity and Gravitation, July 712, 2019, Valencia, Spain
Jerzy Lewandowski
The Type D Horizons And The Petrov Type D Spacetimes
Near Horizon Geometry Equation, Degenerate Killing Horizons
Denis DobkowskiRyłko
Isolated Horions and the Petrov Type D Equation
Multimessenger Universe, June 2327, 2019, Penn State, USA
Jerzy Lewandowski
NonExpanding Horizons: Extreme Isolated and ond NonExtreme of the Petrov type D
Loops'19 Conference, June 1721, 2019, Penn State, USA
Jerzy Lewandowski
Canonical and covariant LQG
XI Black Holes Workshop, December 1718, 2018, Lisbon, Portugal
Jerzy Lewandowski
The Petrov type D isolated horizons and the near horizon geometry equation
The 5th Conference of the Polish Society on Relativity, September 2427, 2018, Wojanów Palace, Poland
Gioele Botta
Quantum reduced loop gravity effective dynamics from a statistical regularization scheme
Denis DobkowskiRyłko
The Petrov type D equation on the cross sections of topologically different isolated horizons
Jerzy Lewandowski
Isolated horizons, the Petrov type D equation and the Near Horizon Geometry equation
Tomasz Pawłowski
Emergent de Sitter epoch of the quantum Cosmos
Istvan Racz
Construction of quasiconvex foliation with monotonous Geroch mass
Jacek Tafel
The Penrose inequality for an axially perturbed Schwarzschild black hole
The Fifteenth Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories (MG15), July 17, 2018, Rome, Italy
Gioele Botta
Quantum reduced loop gravity effective dynamics from a statistical regularization scheme
Denis DobkowskiRyłko
Stationary isolated horizons of the Petrov type D
Jerzy Lewandowski
On the Hamiltonian operator in loop quantum gravity
IX International Meeting on Lorentzian Geometry, June 1823, 2018, Warsaw, Poland
Jerzy Lewandowski
Stationary isolated horizons of the Petrov type D
Sixth Tux workshop on Quantum Gravity, February 1923, 2018, Tux, Austria
Mehdi Assanioussi
On the polymer quantization of YangMills theories: new coherent states
Denis DobkowskiRyłko
Geometric characterization of the Kerrde Sitter horizon
Patryk Drobinski
Continuum approach to the BF vacuum
Maciej Kolanowski
Holographic models for 2dimensional black holes
Jerzy Lewandowski
Petrov type D isolated null surfaces
Ilkka Makinen
A coherentstate representation for the LQG intertwiner space
Tomasz Pawlowski
Emergent de Sitter phase of LQC
Piotr Sułkowski
Quantum geometry and string dualities
Yaser Tavakoli
Particle production in a cosmological quantum spacetime
Cong Zhang
Some analytical results of the Hamiltonian (constraint) operator in LQG
Winter School  Geometry and Physics, Jan 1320, 2018, Srni, Czech Republic
Piotr Sułkowski
Physics of knots  from ChernSimons theory to quivers
Young Researchers in String and Mathematics, Nov 2730, 2017, Bonn, Germany
Piotr Sułkowski
Knots  quivers correspondence
Integrability and Chaos in Multicomponent Systems, Oct 27, 2017, Vladivostok, Russia
Piotr Sułkowski
Knots  quivers correspondence
Jerzy Lewandowski
Surprising properties of geometric Dirac Observables in General Relativity
Carmen Li
Spacetime near an extremal horizon
Anna Nakonieczna
Black hole initial data within the parabolichyperbolic formulation
Jacek Tafel
TT tensors in flat spaces of any dimension
Jerzy Lewandowski
The issues and results of canonical (loop) quantum gravity
Jerzy Lewandowski
Canonical Loop Quantum Gravity
Jerzy Lewandowski
Canonical Loop Quantum Gravity: issues, framework and results
Partyk Drobiński
The continuum BF vacuum representation
Ilkka Makinen
Spin coherent state representation for intertwiners in loop quantum gravity
Jerzy Lewandowski
Lorentz and deformed Poincare symmetry in curved spacetime
Mehdi Assanioussi
Approximation methods for the dynamics in deparametrized LQG
Jerzy Lewandowski
Canonical Loop Quantum Gravity: available framework
Jacek Tafel (invited speaker)
Covariant description of isothermic surfaces
Jerzy Lewandowski
Nonexpanding horizons including near horizon geometries as related subject
Andrzej Trautman
Gravitational waves: what little I remember of my early work on the subject
Jacek Tafel
Optical geometries and algebraically special spacetimes
Ilkka Makinen
Time evolution in deparametrized models of loop quantum gravity
Jerzy Lewandowski
Canonical Loop Quantum Gravity (lecture course)
Jerzy Lewandowski
When near horizon geometries meet nonexpanding horizons
Canonical Loop Quantum Gravity
Jerzy Lewandowski
Canonical Loop Quantum Gravity  Status Report (plenary talk)
Ilkka Makinen
Scalar field as a physical time variable in loop quantum gravity
Jerzy Lewandowski and ChunYen Lin
From The Quantum Scalar Constraint To The Minkowski Theorem
Ilkka Makinen
The Hamiltonian operator in deparametrized loop quantum gravity
International Loop Quantum Gravity Seminar
Jerzy Lewandowski
New applications for LQG
October 28, 2014
Antonia Zipfel
Linking canonical and covariant LQG
April 15, 2014
Norbert Bodendorfer
Black hole entropy from loop quantum gravity: Generalized theories and higher dimensions
October 1, 2013
Emanuele Alseci
Quantum reduced loop gravity
March 12, 2013
Workshop on Noncommutative Field Theory and Gravity, September 2226
Jerzy Lewandowski
Noncommutative structure of spacetime from classical general relativity
XXXV Max Born Symposium, September 712, 2015, Wrocław, Poland
Norbert Bodendorfer
Symmetry reductions in loop quantum gravity based on classical gauge fixings
Ilkka Makinen
A new Hamiltonian operator for loop quantum gravity
Jerzy Lewandowski
Emanuele Alesci
Quantum Reduced Loop Gravity
Mehdi Assanioussi
Recent developments in quantum dynamics of LQG
Jerzy Lewandowski
Canonical LQG
Jędrzej Świeżewski
Quantum Reduction To Spherical Symmetry
Andrea Dapor
Coherent State Operators in Loop Quantum Gravity
Andrea Dapor
Coherent State Operators in Loop Quantum Gravity
Ilkka Mäkinen
Loop Quantum Gravity with a Scalar Field: A Physical Hamiltonian Operator
Emanuele Alesci
Quantum Reduced Loop Gravity
Norbert Bodendorfer
Higher dimensional connection dynamics and applications
Mehdi Assanioussi
New perspectives for canonical LQG dynamics
Jerzy Lewandowski
New applications for canonical LQG
Jędrzej Świeżewski
Using radial gauge to define quantum spherical symmetry
Wojciech Kamiński
Gravity in the radial gauge
Antonia Zipfel
A stability criterion for coherent states
Jerzy Lewandowski
New Results in the Canonical Loop Quantum Gravity
Third EFI winter conference of quantum gravity, February 1620, 2015, Tux, Austria
Mehdi Assanioussi
Deparametrized gravity with a scalar field & Beyond: A new quantum Hamiltonian operator for LQG
Norbert Bodendorfer
A quantum reduction to Bianchi I models in LQG
Andrea Dapor
Rainbows from Quantum Gravity
Marcin Kisielowski
Firstorder Dipole Cosmology
Ilkka Mäkinen
Coherent state operators in loop quantum gravity
Tomasz Pawłowski
Interfacing loop quantum gravity with cosmology
Jedrzej Świeżewski
Radial Gauge  reduced phase space of General Relativity
Conceptual and Technical Challenges for Quantum Gravity, Rome, Italy, September 812, 2014
Jerzy Lewandowski
Conceptual and technical chalanges of LQG
Friday
Emanuele Alesci
Quantum Reduced Loop Gravity
Tuesday
Abstract
Quantum Reduced Loop Gravity is a recently proposed model to address the quantum dynamics of the early Universe. We will review it’s semiclassical limit, a link with LQC and how the QRLG could simplify the analysis of the dynamics in the full theory.
Frontiers of fundamental physics 14, Marseille, France, July 1518, 2014
Jerzy Lewandowski
Background independence of GR and in LQG
July 17
Abstract
The physical meaning of the diffeomorphisms in the general relativistic theories will be discussed, the issues of time evolution in terms of the Dirac observables and physical Hamiltonian will be addressed. New proposals for geometric deparametrization will be presented. The quantum part of the lecture will concern the canonical LQG. New, improved formulations of the quantum Hamiltonian will be proposed. New applications for LQG will be offered. Original results that will be presented in this lecture were obtained in collaboration with: Dapor, Duch, Kaminski, Swiezewski, Alesci, Assanioussi, Dziendzikowski and Sahlmann.
Jerzy Lewandowski
Exact formulation of the quantum scalar constraint in LQG
July 18
Abstract
Several new applications for LQG will be presented. The first one is a new quantum representation of the gravitational scalar constraint. In this representation, for the first time in the literature, the quantum C(N) itself preserves the Hilbert space for every laps function N. Owing to that property, solutions to the quantum constraints of vacuum GR can be well defined by the spectral decomposition and set a physical Hilbert space. Our representation admits also a new proposal of the quantum physical Hamiltonian of the RovelliSmolin model of gravity coupled to the massless KleinGordon time field. The third application we propose, is a new operator for the quantum Hamiltonian of the KleinGordon Scalar field coupled to LQG. Our new framework captures the degrees of freedom of the scalar field lost in the framework in which time is deparametrized by the scalar field.
Jędrzej Świeżewski
Observers diffeomorphisminvariant description of a general relativistic system
July 18
Abstract
I will present a construction of observables following naturally from an introduction of an observer into a relativistic theory. The observables are invariant under a large class of spatial diffeomorphisms. I will discuss the description of the theory in terms of spatialdiffeomorphisminvariant degrees of freedom. The talk will be based on P. Duch, W. Kaminski, J. Lewandowski and J. Swieżewski, Observables for General Relativity related to geometry, arXiv:1403.8062 [grqc].
Mehdi Assanioussi
Application of the Curvature operator: Matrix Elements and properties of the new Hamiltonian Constraint operator in LQG
July 18
Abstract
This talk is a presentation of an ongoing work based on [1] of the same authors. In this work we study properties of the Lorentzian Hamiltonian constraint operator expressed using the curvature operator introduced in [1] and we evaluate its action.
[1] E. Alesci, M. Assanioussi and J. Lewandowski, A curvature operator for LQG, Submitted for publication in Phys. Rev. D [arxiv: 1403.3190v2].
Andrea Dapor
Coherent State Operators in Cosmology and Gravity
July 18
Abstract
Coherent States (CS) are widely used in physics, and quantum gravity is not an exception. However, the application of CS in the construction of operators is rather unexplored in the areas of quantum gravity and quantum cosmology. In my talk, I will present how CS can be used to define “coherent state operators” via a procedure known as “coherent state quantization” [1]. This procedure produces operators with inbuilt good semiclassical properties, while at the same time preserving typical quantum attributes (e.g., discreteness of spectra). Examples of such coherent state quantization will cover: (1) operators on homogeneous isotropic quantum cosmology [2] (based on the affine group); (2) possible extensions to Bianchi I case; (3) simple operators on L2(SU(2),dμH).
[1] S. Twareque Ali, J.P. Antoine and J.P. Gazeau, Coherent States, Wavelets, and Their Generalizations, SpringerVerlag (2013)
[2]H. Bergeron, A. Dapor, J.P. Gazeau and P. Malkiewicz, Smooth big bounce from affine quantization/, Phys. Rev. D 89, 083522 (2014)
Antonia Zipfel
Plebanski sectors of the Lorentzian 4simplex amplitude
July 15
Abstract
The spin foam model is based on a BFtype action restricted by the simplicity constraint. However, the solutions to the simplicity constraint fall into five different sectors. In [1,2] it was argued that a certain mixing of these sectors and the freedom of choosing a tetrad orientation generates undesired terms in the asymptotic of the Euclidean EPRLmodel and can be cured by an additional constraint. We here show that this is also the case for the Lorentzian model. This is joint work with J. Engle.
[1] J. Engle, A spinfoam vertex amplitude with the correct semiclassical limit, Phys.Lett. B724 (2013) 333337.
[2] J. Engle, A proposed proper EPRL vertex amplitude, Phys.Rev D87 (2012) 084048.
Emanuele Alesci
Quantum Reduced Loop Gravity
July 18
Abstract
We will review the current developments of Quantum Reduced Loop Gravity, a recently proposed model to address the quantum dynamics of the early Universe. In particular we will discuss its semiclassical limit, a link with LQC and will review how the QRLG technique naturally selects states based on coherent intertwiners that could simplify the analysis of the dynamics in the full theory.
XXXIII Max Born Symposium, Wrocław, Poland, July 610, 2014
Norbert Bodendorfer
The Verlinde formula and higherdimensional black hole entropy
July 8
Jerzy Lewandowski
The issues and advances in LQG
July 9
DPGFrühjahrstagung 2014, Berlin, Germany
Norbert Bodendorfer
Loop quantum gravity in higher dimensions and black hole entropy
March 17, 2014, Berlin
4th Central European Relativity Seminar, Vienna, Austria, February 27  March 1, 2014
Norbert Bodendorfer
Loop quantum gravity in higher dimensions and black hole entropy
March 1, 2014, Tux
Jędrzej Świeżewski
Geometrical observables for General Relativity related to distances and angles
February 27, 2014, Tux
Abstract
In my talk, I will present the progress obtained in a certain approach to constructing diffeomorphism invariant observables for General Relativity possessing a direct geometrical interpretation. After introducing the observables I will discuss their Poisson algebra. A possibility of reducing the phase space of General Relativity to diffeomorphism invariant degrees of freedom will be highlighted.
New trends in Teichmuller theory and mapping class groups, Oberwolfach (MFO), Germany, February 917, 2014
Piotr Sułkowski
Chord diagrams, random matrices, and topological recursion
Second EFI winter conference on canonical and covariant LQG, Tux, Austria, February 1014, 2014
Jerzy Lewandowski
Deparametrising GR with distances and angles and interpreting it geometrically
February 14, 2014, Tux
Jędrzej Świeżewski
Deparametrising GR with distances and angles
February 14, 2014, Tux
Antonia Zipfel
Plebanski sectors of the Lorentzian 4simplex amplitude
February 14, 2014, Tux
Norbert Bodendorfer
Some comments and open questions on black hole entropy from LQG
February 13, 2014, Tux
Wojciech Kaminski
Surprises in the asymptotic analysis of the spinfoam vertex
February 10, 2014, Tux
Symposium of the Institute for Theoretical Physics, Warsaw, Poland, December 1314, 2013
Piotr Sułkowski
On dualities in string theory
II Konwencja Badań i Innowacji, Warsaw, Poland, November 29, 2013
Piotr Sułkowski
Quantum Fields and Knot Homologies
Nobember 29, 2013, Warsaw
Sympozjum KRAB, Warsaw, Poland, November 28, 2013
Piotr Sułkowski
Quantum Fields and Knot Homologies
Nobember 28, 2013, Warsaw
Loops 13, Perimeter Institute, Waterloo, Canada, July 2226, 2013
Marcin Kisielowski
On firstorder contributions to the Dipole Cosmology transition amplitude
July 26, 2013, Waterloo
Abstract
We discuss some firstorder contributions to the (Euclidean) Dipole Cosmology transition amplitude. These amplitudes correspond to spin foams having the boundary graph of Dipole Cosmology, one internal vertex and no edges connecting this vertex with itself. We expect that the amplidutes are dominated by the BianchiRovelliVidotto transition amplitude in a limit of large volume of the universe, and the transition amplitude including contributions from all these spin foams gives the correct Friedmann dynamics in the classical limit.
Antonia Zipfel
On the relation between canonical and covariant Quantum Gravity
July 26, 2013, Waterloo
Abstract
Heuristically, spin foams can be understood as the Feynman graphs of Quantum Gravity. Yet, summing over all histories would lead to a projector on the physical Hilbert space of the canonical theory rather than to a true propagator due to the constraint nature of GR. Following this idea we construct a

