Sebastian Zajac earned his PhD in Physics at the University of Silesia in Katowice. He is currently a theoretical physicist, an assistant professor and an associate dean for infrastructure at the
Faculty of Mathematics and Natural Studies, Cardinal Stefan Wyszynski University in Warsaw (Poland).

He is a American Physical Society member. The focus of his research is
mathematical physics, statistics and data analysis, in particular phenomenology of neutrino physics and geometry, topology and Category Theory in Quantum Mechanics and Quantum Field Theory. His latest publications center around the
flavour problem in the field of neutrino physics. With prof. Piotr Sulkowski they are trying to characterize RNA and protein structures by their topological characteristics called genus.

Doctor of Philosophy
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*17.09.2013*

Advisor: prof. dr hab. Marek Zralek

Accelerator neutrino oscillations and their non-standard interactions (PL).
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Master of Science
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*27.06.2007*

Advisor: dr hab. Jerzy Król

Some geometrical and topological methods in classical and quantum field theory.(PL)
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Bechelor of Science
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*27.06.2005*

Advisor: dr hab. Jacek Syska

Time Series analysis with ARMA and ARIMA processes. Application in SAS. (PL)
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Musician
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*2004*

Advisor: Franciszek Prus

Accordeon class.

P.Chaber, B. Dziewit, J. Holeczek, M. Richter, M. Zrałek, S.Z.

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*to appear*

In frame of the two-Higgs Doublet Model we try to find some discrete, non-abelian flavour symmetry, which could explain masses and mixing matrix elements for leptons. Unlike to the Standard Model currently the flavour symmetry need not to be broken. With the GAP program we investigate all finite groups up to 1025 order that have 2 and 3-dimensional irreducible, faithful representations. Up to such order there is no group, for which it is possible to select free model parameters in order to match, in satisfactory way, the masses of charged leptons, masses of neutrinos, and PMNS mixing matrix elements.

S.Z., C. Geary, E.A. Andersen, P.Dabrowski-Tumanski, J.Sulkowska, P.Sulkowski

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*to appear*

We introduce the notion of the genus trace, which describes dependence of genus on the choice of a subchain of a given backbone chain. We find that the genus trace encodes interesting physical and biological information about a given biomolecule and its three dimensional structural complexity. We illustrate this statement by showing how the genus trace captures properties of various types of base pairs in RNA, enables to identify a domain structure of a ribosome and of proteins, etc. We find that the shape of the genus trace can detect cooperative folding inside multidomain protein. We also conduct a survey of all published RNA structures better than 3 A resolution in the PDB database, and find that natural structural RNAs have a roughly linear relationship in genus complexity per unit length.

B.Dziewit, J.Holeczek, M.Richter, M.Zralek, S.Z.

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*Physics of Atomic Nuclei Vol. 80, No. 4 (09.2017)*

In order to explain the fermions masses and mixing parameters appearing in the lepton sector of the Standard Model, one proposes the extension of its symmetry. A discrete, non-abelian subgroup of U(3) is added to the gauge group SU(3)
_{C}xSU(2)
_{L}xU(1)
_{Y} . Apart from that, one assumes the existence of one extra Higgs doublet. This article focuses mainly on the mathematical theorems and computational techniques which brought us to the results.
arXiv preprint

B.Dziewit, J.Holeczek, M.Richter, M.Zralek, S.Z.

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*Physics of Atomic Nuclei Vol. 80, No. 2 (07.2017)*

The Standard Model does not explain the hierarchy problem. Before the discovery of nonzero lepton mixing angle theta
_{13} high hopes in explanation of the shape of the lepton mixing matrix were combined with non-Abelian symmetries. Nowadays, assuming one Higgs doublet, it is unlikely that this is still valid. Texture zeroes, that
are combined with abelian symmetries, are intensively studied. The neutrino mass matrix is a natural way to study such symmetries.

arXiv preprint

B.Dziewit, J.Holeczek, M.Richter, M.Zralek, S.Z.

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*Acta Physica Polonica B46 (2015)*

In the framework of a two Higgs doublet model, we try to explain lepton masses and mixing matrix elements assuming that neutrinos are Dirac particles. Discrete family symmetry groups, which are subgroups of U(3) up to the order of 1025 are considered. Like in the Standard Model with one Higgs doublet, we found that discrete family symmetries do not give satisfactory answer to these basic questions in the flavour problem.

B.Dziewit, M.Zralek, S.Z.

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*Acta Physica Polonica B44 (2013)*

A brief discussion about the current status of the search for the possible finite symmetry of a leptonic mass matrix is presented. Possible extensions of the models of leptons that can describe the masses and mixing elements are discussed.

B.Dziewit, M.Zralek, S.Z.

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*Acta Physica Polonica B42 (2011)*

From the new existing data with not vanishing θ13 mixing angle we determine the possible shape of the Majorana neutrino mass matrix. We assume that CP symmetry is broken and all Dirac and Majorana phases are taken into account. Two possible approaches “bottom–up” and “top–down” are presented. The problem of unphysical phases is examined in detail.

E.W.Piotrowski, J.Sładkowski, J.Syska, S.Z.

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*Physica Status Solidi B, 246 (2009)*

The subjects of the paper are the likelihood method (LM) and the expected Fisher information (FI) considered from the point od view of the construction of the physical models which originate in the statistical description of phenomena. The master equation case and structural information principle are derived. Then, the phenomenological description of the information transfer is presented. The extreme physical information (EPI) method is reviewed. As if marginal, the statistical interpretation of the amplitude of the system is given. The formalism developed in this paper would be also applied in quantum information processing and quantum game theory.

J.Syska, M.Zralek, S.Z.

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*Acta Physica Polonica B38 (2009)*

The process of the neutrino production, oscillation in the vacuum or in matter, and detection in the case of interactions which are beyond the Standard Model is considered. Neutrino states are described by the density matrix. The final neutrino production rate does not factorize. The known Maki–Nakagawa–Sakata neutrino states and the factorized production rate are recovered in the vSM regime.

AMA Institute, Warsaw
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*10.2017*

UKSW
WMP. SNŚ Warsaw
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*09.2016*

Warsaw School of Economics, Warsaw
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*02.2016*

UKSW WMP.SNS, Warsaw
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*09.2015*

Maxymiser Oracle, Warsaw
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*11.2015-02.2016*

University of Silesia, Katowice
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*04.2014-04.2018*

UKSW WMP.SNS, Warsaw
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*10.2013-09.2015*

Warsaw University, Warsaw
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*09.2013-09.2014*

GoWork, Warsaw
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*07.2013-01.2015*

Biostat, Rybnik
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*11.2011-01.2012*

Wasko, Gliwice
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*07.2011-09.2011*

- Data processing in SAS: part I (SAS 2017)
- Data processing in SAS: macro language (SAS 2017)
- Introduction to Machine Learning with Python (Sages 2017)
- BigData Analysis with Apache Spark (ESSAM-ICM 2016)
- Designing and creating OLAP cubes (SAS 2016)
- Business analysis with SAS Visual Analytics (SGH, SAS 2016)
- Introduction to Big Data and Apache Hadoop (Sages 2014)

Analysis with Pandas - Python Data Analysis Library

Big Data, Data Analysis