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Contact: swiezew AT gmail DOT com
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In late 2016, I have defended my PhD in theoretical physics at the University of Warsaw. My scientific CV can be found here.
My research has concentrated on proposing reformulations of Hamiltonian descriptions of Einstein's general relativity useful in the study of two main approaches to quantum gravity: loop quantum gravity and in the context of AdS/CFT correspondence inspired by string theory.
I have authored and co-authored 9 papers published in peer-reviewed journals which can be found on inSPIRE. For a fun visualisation of the location of my contributions on the map of the relevant part of science see paperscape (type my surname in the search box at the top).
A detailed list of the talks I gave can be found in my CV. Below I keep track of the locations in which I gave academic talks (conferences in purple, seminars in green).

I was the principal investigator of a research grant funded by the Polish National Science Centre.
In this paragraph I will give a short description of my most important results. If you are interested do not hesitate to contact me personally.
Initially I studied a gravitational model in the teleparallel geometry. The aim of the project was to establish tools for performing Hamiltonian analysis of theories formulated in the language of differential forms, staying in that language. The success of the project paved the way for an analysis of the full teleparallel equivalent of general relativity. Additionally, it showed interesting structural similarities between general relativity and electromagnetism.
The core of the results I obtained next was a definition of a new family of gauge-invariant observables for canonical general relativity. It realizes an old idea, based on the introduction of an observer into a gravitating system. With my collaborators I managed to formalize this idea and derive all the properties necessary for an application of it (e.g., explicit form of the Poisson algebra of the observables).
A reformulation of the observer's approach in the language of a gauge fixing provided a simplified description of canonical general relativity in which the diffeomorphism gauge freedom is limited or gotten rid of entirely. It seems to be particularly useful in the context of numerical Hamiltonian analysis of gravitating systems.
The gauge-fixed formulation led to an important theoretical advance after it has been quantised employing loop quantum gravity techniques. The advance consists of showing that the symmetry reduced models studied in the loop quantum gravity community (so-called midisuperspace models) indeed can be embedded in a theory quantised before symmetry reduction is performed. This enables, e.g., a future study of the quantum stability of spherical symmetry under evolution.
Lastly, a closely related construction of a gauge fixing had attracted attention in the context of the boundary perspective on the AdS/CFT correspondence (under the name of Fefferman-Graham, axial or holographic gauge). With my collaborators, I was able to clarify certain misunderstandings concerning locality properties of the bracket algebra in that gauge. In this way we showed that the mentioned gauge is not particularly useful for the purpose it was supposed to serve in that context, since it introduces severe non-localities even into brackets of a given field with itself (for some locations).