INSTYTUT FIZYKI TEORETYCZNEJ
WYDZIAŁ FIZYKI UNIWERSYTETU WARSZAWSKIEGO

Conferences

Contact

Chair of Theory of
Relativity and Gravitation,
Institute of Theoretical Physics,
University of Warsaw
ul. Pasteura 5,
02-093 Warsaw, Poland

Phone: (+48 22) 55 32 949




Media

Youtube
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


J. Pniewski & L. Infeld Colloquium
Jerzy Lewandowski
 

 
Virtual conference of the Polish Society of Relativity 2020 [online]
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

Non-singular Kerr-NUT-de Sitter spacetimes


International Loop Quantum Gravity Seminar  2020

           Maciej Ossowski

Kerr-NUT-dS spacetimes that admit non-singular 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 6th Conference of the Polish Society on Relativity
           Denis Dobkowski-Ryłko
The solution to the Petrov type D equation on the non-trivial bundle topology and its embedability

            Maciej Kolanowski
Anti-evaporation of Schwarzschild-de Sitter black hole revisited

           Anna Nakonieczna
Multidimensional dynamics of the brane-dilaton black hole system


 


Conference on the occasion of Jerzy Lewandowski's 60th birthday (Jurekfest), September 16-20, 2019, Warsaw, Poland

            Denis Dobkowski-Ryłko
Isolated horizons, near horizon geometries and the Petrov type D equation

            Maciej Kisielowski
On the relation between loop quantum gravity and spin-foam models

            Jacek Tafel
The Penrose inequality for the perturbed Schwarzschild initial data


 


Twistors and Loops meeting in Marseille, September 2-6, 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 14-19, 2019, Guiyang, China

            Jerzy Lewandowski
Canonical and covariant LQG

 


22nd International Conference on General Relativiity and Gravitation, July 7-12, 2019, Valencia, Spain


            Jerzy Lewandowski
The Type D Horizons And The Petrov Type D Spacetimes
Near Horizon Geometry Equation, Degenerate Killing Horizons

            Denis Dobkowski-Ryłko
Isolated Horions and the Petrov Type D Equation




Multimessenger UniverseJune 23-27, 2019, Penn State, USA

            Jerzy Lewandowski
Non-Expanding Horizons: Extreme Isolated and ond Non-Extreme of the Petrov type D





Loops'19 Conference, June 17-21, 2019, Penn State, USA


            Jerzy Lewandowski
Canonical and covariant LQG


 


Seventh Tux workshop on Quantum Gravity, February 11-15, 2019, Tux, Austria


            Mehdi Assanioussi

Investigating Hamiltonian regularizations in LQG using symmetry reduced models

             Denis Dobkowski-Ryłko

Petrov type D equation on the Hopf Bundle

             Maciej Kolanowski

Conformally covariant quantum states given on conformal Killing horizons

 


 


XI Black Holes Workshop, December 17-18, 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 24-27, 2018, Wojanów Palace, Poland

            Gioele Botta
Quantum reduced loop gravity effective dynamics from a statistical regularization scheme

             Denis Dobkowski-Ryłko

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 quasi-convex 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 1-7, 2018, Rome, Italy


             Gioele Botta
Quantum reduced loop gravity effective dynamics from a statistical regularization scheme

             Denis Dobkowski-Ryłko

Stationary isolated horizons of the Petrov type D

             Jerzy Lewandowski

On the Hamiltonian operator in loop quantum gravity





IX International Meeting on Lorentzian GeometryJune 18-23, 2018, Warsaw, Poland

             Jerzy Lewandowski
Stationary isolated horizons of the Petrov type D




Sixth Tux workshop on Quantum Gravity, February 19-23, 2018, Tux, Austria


            Mehdi Assanioussi

On the polymer quantization of Yang-Mills theories: new coherent states

             Denis Dobkowski-Ryłko

Geometric characterization of the Kerr-de 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 coherent-state 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 13-20, 2018, Srni, Czech Republic


             Piotr Sułkowski 
Physics of knots - from Chern-Simons theory to quivers


 



Young Researchers in String and Mathematics, Nov 27-30, 2017, Bonn, Germany


             Piotr Sułkowski 
Knots - quivers correspondence





Category theory in physics, mathematics and philosophy, Nov 16-17, 2017, Warsaw, Poland


             Piotr Sułkowski 
Categorification in knot theory and physics





Integrability and Chaos in Multicomponent Systems, Oct 2-7, 2017, Vladivostok, Russia


             Piotr Sułkowski 
Knots - quivers correspondence





The 4th Conference of the Polish Society on Relativity, September 24-28, 2017, Kazimierz Dolny, Poland


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 parabolic-hyperbolic formulation
             Jacek Tafel
TT tensors in flat spaces of any dimension




8th Forum of Polish Mathematicians, Sep 18-22, 2017, Lublin, Poland


             Piotr Sułkowski 
Knots - quivers correspondence





44. Zjazd Fizyków Polskich, Sep 10-15, 2017, Wrocław, Poland


             Piotr Sułkowski 
String theory and quantum mathematics





9th Mathematical Physics Meeting: School and Conference on Modern Mathematical Physics, September 18-23, 2017, Belgrade, Serbia


Jerzy Lewandowski
The issues and results of canonical (loop) quantum gravity




44 Zjazd Fizyków Polskich, September 10-15, 2017, Wrocław, Poland


Jerzy Lewandowski
Canonical Loop Quantum Gravity




The international workshop on Noncommutative Geometry, Duality and Quantum Gravity, September 4-6, 2017, Kyoto, Japan


Jerzy Lewandowski
Canonical Loop Quantum Gravity: issues, framework and results




Loops'17, July 3-7, 2017, Warszawa, Poland


Partyk Drobiński
The continuum BF vacuum representation
             Ilkka Makinen
Spin coherent state representation for intertwiners in loop quantum gravity




Fifth Tux workshop on Quantum Gravity, February 13-17, 2017, Tux, Austria


Jerzy Lewandowski
Lorentz and deformed Poincare symmetry in curved spacetime
             Mehdi Assanioussi
Approximation methods for the dynamics in deparametrized LQG




Quantum Spacetime '17, January 30-February 3, 2017, Porto, Portugal


Jerzy Lewandowski
Canonical Loop Quantum Gravity: available framework




Nonlinearity & Geometry, January 20-23, 2017, Warszawa


Jacek Tafel (invited speaker)
Covariant description of isothermic surfaces




37th Winter School Geometry and Physics, January 14-21, 2017, Srni, Czech Republic


Jerzy Lewandowski
Non-expanding horizons including near horizon geometries as related subject




Gravitational waves. Mathematical, computational, astrophysical and quantum approaches, December 9-11, 2016, Warszawa


Andrzej Trautman
Gravitational waves: what little I remember of my early work on the subject
Jacek Tafel
Optical geometries and algebraically special spacetimes




The 3rd Conference of the Polish Society on Relativity, September 25-29, 2016, Kraków, Poland


Ilkka Makinen
Time evolution in deparametrized models of loop quantum gravity




The 3rd BNU International Summer School on Quantum Gravity, August 15-20, 2016, Beijing Normal University (BNU), Beijing, China


Jerzy Lewandowski
Canonical Loop Quantum Gravity (lecture course)




21st International Conference on General Relativity and Gravitation (GR21), July 10-15, 2016, New York City, USA


Jerzy Lewandowski
When near horizon geometries meet non-expanding horizons
Canonical Loop Quantum Gravity





Noncommutative geometry, quantum symmetries and quantum gravity II - XXXVII Max Born Symposium hosting 2016 WG3 Meeting of COST Action MP 1405, July 4-7, 2016, Wrocław, Poland


Jerzy Lewandowski
Canonical Loop Quantum Gravity - Status Report (plenary talk)




The Helsinki Workshop on Quantum Gravity, June 1-3, 2016, Helsinki, Finland


Ilkka Makinen
Scalar field as a physical time variable in loop quantum gravity


 

Carlo Fest, May 23-27, 2016, Luminy and Jardin du Pharo, Marseille, France


Jerzy Lewandowski and Chun-Yen Lin
From The Quantum Scalar Constraint To The Minkowski Theorem




Fourth Tux workshop on Quantum Gravity, February 15-19, 2016, Tux, Austria


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 22-26


Jerzy Lewandowski
Non-commutative structure of spacetime from classical general relativity




XXXV Max Born Symposium, September 7-12, 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




Quantum Gravity Meeting, July 20 - 23, 2015, University of Rome La Sapienza, Rome, Italy


Emanuele Alesci
 

Jerzy Lewandowski





Fourteenth Marcel Grossmann Meeting - MG14, July 12-18, 2015, University of Rome La Sapienza, Rome, Italy


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




LOOPS 15, July 6-10, 2015, Erlangen, Germany


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




GENERAL RELATIVITY AND GRAVITATION: A CENTENNIAL PERSPECTIVE, June 7-12, 2015, Pennsylvania, USA


Jerzy Lewandowski
New Results in the Canonical Loop Quantum Gravity




Third EFI winter conference of quantum gravity, February 16-20, 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
First-order 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 8-12, 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 15-18, 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 Rovelli-Smolin model of gravity coupled to the mass-less Klein-Gordon time field. The third application we propose, is a new operator for the quantum Hamiltonian of the Klein-Gordon 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 diffeomorphism-invariant 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 spatial-diffeomorphism-invariant 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 [gr-qc].

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, Springer-Verlag (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 4-simplex amplitude
July 15
Abstract
The spin foam model is based on a BF-type 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 EPRL-model 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 spin-foam vertex amplitude with the correct semiclassical limit, Phys.Lett. B724 (2013) 333-337.
[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 6-10, 2014


Norbert Bodendorfer
The Verlinde formula and higher-dimensional black hole entropy
July 8

Jerzy Lewandowski
The issues and advances in LQG
July 9




DPG-Frühjahrstagung 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 9-17, 2014


Piotr Sułkowski
Chord diagrams, random matrices, and topological recursion




Second EFI winter conference on canonical and covariant LQG, Tux, Austria, February 10-14, 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 4-simplex 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 spin-foam vertex
February 10, 2014, Tux




Symposium of the Institute for Theoretical Physics, Warsaw, Poland, December 13-14, 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 22-26, 2013


Marcin Kisielowski
On first­order contributions to the Dipole Cosmology transition amplitude
July 26, 2013, Waterloo
Abstract
We discuss some first-order 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 Bianchi-Rovelli-Vidotto 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
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