Z wielkim żalem zawiadamiamy, że w dniu 3 marca 2012 roku po długiej chorobie zmarł Nasz Kolega i Przyjaciel, fizyk, kosmolog i popularyzator nauki – profesor Jerzy Stelmach. Beeing deeply in sorrow we let you know that our collegue and friend professor Jerzy Stelmach passed away on the 3rd of March 2012.. Uroczysta msza żałobna, na której środowisko uniwersyteckie oraz wszyscy bliscy pożegnają Profesora odbędzie się w środę 7 marca 2012 roku o godzinie 14.00 w Kościele Seminaryjnym przy ulicy Papieża Pawła VI nr 2 w Szczecinie. The service in memory of him will be held in the Church of the Faculty of Theology (Papieża Pawła VI street No 2) at 2 p.m. on Wednesday 7th of March 2012. Pogrzeb Profesora odbędzie się na cmentarzu św. Wawrzyńca przy ul. Bujwida 51 we Wrocławiu w piątek 9 marca 2012 roku o 16.00. The funeral will be in the św. Wawrzyniec cemetery, Bujwida 51 street in Wrocław on Friday 9th of March 2012 at 4 p.m. Na stronie Uniwersytetu Szczecińskiego http://beta.univ.szczecin.pl/ można dokonać wpisu do internetowej księgi kondolencyjnej The book of condolences is available via the University of Szczecin server http://beta.univ.szczecin.pl/
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Nota biograficzna.
Krótkie wspomnienie.
Osiągnięcia prof. Jerzego Stelmacha w zakresie popularyzacji nauki.
I am a theoretical physicists. I deal with cosmology. In particular, I am interested in the influence of various types of matter (also “exotic” types of negative pressure) onto the evolution of the Universe. I also investigate the relation between the geometry of the universe and its evolution. Apart from that, by using the numerical methods together with statistical thermodynamics I study the evolution and status of the large-scale structure of the Universe.
My scientific interests also refer to astrophysics and astronomy in a very broad sense. In fact, I am interested in physics as a whole, including the experimental physics. I am also interested in a relation between science and faith. I also feel the popularisation of the pure sciences is my vocation.
Since then I changed my interest into cosmology and nowadays I deal with the following topics:
– The influence of various types of matter onto the evolution of the universe.
This topic was considered in my habilitation degree. I was collaborating on this particular subject for many years with Mariusz P. Dąbrowski. We were especially interested in the (then called) “exotic” forms of matter which gave negative pressure (cosmic strings, domain walls, textures) onto the pace of the evolution of the Universe. We are very satisfied that after about 20 years of our investigations our theoretically predicted models (of negative pressure) were confirmed by supernovae observations. Mariusz P. Dąbrowski went even further and investigated supernegative pressure models (phantom models) recently.
– The evolution of inhomogeneous models of the universe. Alternative gravity models.
There is a view that some challenges of cosmology cannot be explained within the framework of standard homogeneous and isotropic Friedmann models of the universe and that one whould apply less symmetric models of the universe to explain some phenomena. With Izabela Jakacka we have been studying the inhomogeneous model of the universe known as Stephani Universe. We have shown that the spherically symmetric Stephani Universe admits cosmic acceleration due to its inhomogeneity without any need for exotic (negative pressure) types of matter.
– The origin of the large-scale structure of the Universe.
The galaxy formation problem is one of the most important problems in cosmology. However, it is imperative to apply numerical methods to deal with the problem. Having collaborated with Zbigniew Sekulski from Technical University of Szczecin we produced our own numerical code to study the problem of galaxy formation. Graphics was elaborated together with Jan Budziński from Institute of Physics.
– The description of the large-scale structure of the universe.
In collaboration with Yakov Granovskii we have elaborated an approach to galaxy formation which assumes that galaxies behave as gas particles which interact gravitationally and thes particles are in thermodynamical equilibrium. We have calculate the power spectrum for our model. In collaboration with W. Godłowski and M. Szydłowski from Yagiellonian University we are working on a new way to calculate the power spectrum for the large-scale structure of the universe. This approach generalizes the one presented some years ago by Krzysztof Górski.
– Astrobiology and space weather
Publications
Research papers:
1. W. Garczyński i J. Stelmach, ,,A lattice Field Theory in Quasicontinual Representation“, Bull. Acad. Pol. Sci. Ser. Sci. Math. Astron. Phys. 28, 73-77 (1980).
2. W. Garczyński i J. Stelmach, ,,Construction of Canonical Constants of Motion for Non-local Field Theories“, Bull. Acad. Pol. Sci. Ser. Sci. Math. Astron. Phys. 28, 141-146 (1980).
3. W. Garczyński i J. Stelmach, ,,Quasicontinual Representation for a Field Given on a Finite Volume“, Bull. Acad. Pol. Sci. Ser. Sci. Math. Astron. Phys. 28, 159-163 (1980).
4. W. Garczyński i J. Stelmach, ,,Quasicontinual Approach to a Field Theory on a Lattice. General Theory“, J. Math. Phys. 22, 1106-1115 (1981).
5. W. Garczyński i J. Stelmach, ,,Quasicontinual Representation of a Field Given on a Finite Lattice. General Theory“, J. Math. Phys. 23, 1162 – 1172 (1982).
6. W. Garczyński i J. Stelmach, ,,Canonical Approach to constructing Constants of Motion for Non-local Field Theories“, Acta Phys. Polon. B15, 137-148 (1983).
7. W. Garczyński i J. Stelmach, ,,Probing Space Microstructure with Compton Scattering“, Lett. al Nuovo Cimento, 40 257-262 (1984).
8. M. P. Dąbrowski i J. Stelmach, ,,Analytic Solutions of Friedman Equation for Spatially Open Universe with Cosmological Constant and Radiation“, Ann. Phys.( N.Y.) 166, 422-442 (1986).
9. M. P. Dąbrowski i J. Stelmach, ,,A Redshift-Magnitude Formula for the Universe with Cosmological Constant and Radiation Pressure“, Astron. J. 92, 1272-1277 (1986).
10. M. P. Dąbrowski i J. Stelmach, ,,Astrophysical Formulae for Friedman Models with Cosmological Constant and Radiation“, Astron. J. 94, 1373-1379 (1987).
11. M. P. Dąbrowski i J. Stelmach, ,,Observable Quantities in Cosmological Models with Strings“, Astron. J. 97, 978-985 (1989).
12. R. Byrka, M. P. Dąbrowski i J. Stelmach, ,,Large – and Small – Angle Anisotropies of the Microwave Background in Cosmological Models with Non-zero ?-term“, Phys. Rev. D41, 2434-2443 (1990).
13. J. Garecki i J. Stelmach, ,,Cosmological Implications of Some Parametrization of Gravitating Hydrodynamics“, Ann. Phys. (N.Y.) 204, 315-330 (1990).
14. J. Stelmach, ,,Nonmetricity Driven Inflation“, Class. Quantum Gravity, 8, 897-907 (1991).
15. R. Byrka, M. P. Dąbrowski i J. Stelmach, ,,Effect of exotic matter on the angular size of anisotropies of the microwave background“, Nucl. Phys. B406, 471-480 (1993).
16. J. Stelmach, ,,Can Textures Solve the Horizon Problem“, GRG 26, 275 (1994).
17. J. Stelmach ,,VLBI Data of Compact Radio Sources vs. Exotic Forms of Matter in the Universe“, Ap. J. 428, 61 (1994).
18. J. Stelmach ,,Perturbation growth and Cosmic Microwave Background Anisotropies in the string-like Matter-dominated Universe“, Phys. Rev. D53 No 12 (1996).
19. J. Stelmach ,,Horizon problem in a closed universe dominated by fluid with negative pressure“, Ann. Phys. (Leipzig) 8, 837-848, (1999).
20. Jerzy Stelmach and Izabela Jakacka, ,, Non-homogeneity driven universe acceleration“, Classical and Quantum Gravity, 2001, 18, 2643-2658
21. Ya.I. Granovskii and J. Stelmach, ,,Power spectrum of fluctuations in self-gravitating systems in a statistical thermodynamics approach“, Annalen der Physik 2002, 9, 1-5
Conference papers
1. M. P. Dąbrowski J. Stelmach, ,,Relations Between Astronomical Parameters for the Universe with Cosmological Constant and Radiation Pressure“, Proceedings of the NATO Advanced Study Institute Gauge Theory and the Early Universe, Erice 1986. Kluwer Academic Publishers 1988, series C, no. 246, p. 373-382.
2. M. P. Dąbrowski i J. Stelmach, ,,Cosmic Strings as a Candidate for Dark Matter. Astrophysical Formulae“, Proceedings of the IAU Symposium No. 130 Evolution of Large Scale Structures in the Universe, Balatonfuered 1987, edited by J. Audouze, Marie -Christine Pelletan and A. Szalay (Kluwer Academic Publisher, 1988).
3. J. Stelmach, ,,Stworzenie warunków do powstania życia w kontekście ewolucji wczesnego wszechświata“, Materiały z konferencji Egzobiologia, czyli poszukiwanie życia w kosmosie, Szczecin 2002, Wydawnictwo Naukowe Uniwersytetu Szczecińskiego.
Textbooks
T. Molenda i J. Stelmach, ,,Fizyka dla uczniów szkół średnich“, Wydawnictwo INTERBOOK, Szczecin 1997 (I wyd.), 1998 (II wyd. popr.), 1999 (III wyd.) (in polish).
Preprints
1. J. Stelmach, ,,Renormalization of Quantum Electrodynamics Given on Infinite Space Lattice with SLAC Derivatives“, ITP UWr 85/634, Uniwersytet Wrocławski.
2. J. Stelmach, ,,On Gravitating Hydrodynamics with Nontrivial Equation of State“, Październik 1987, Katedra Fizyki Uniwersytetu Szczecińskiego.
3. J. Stelmach, ,,Analytic Description of the Friedman Universe Filled with Stiff Like Matter Coupled Thermodynamically to Radiation“, Listopad 1988, Katedra Fizyki Uniwersytetu Szczecińskiego.
4. J. Stelmach, ,,On Comoving Temperature Gauge in Relativistic Hydrodynamics“, Październik 1990, Katedra Fizyki Uniwersytetu Szczecińskiego.
5. J. Stelmach, ,,Analytic Description of the Universe in Einstein-Cartan Theory”, Listopad 1992, Katedra Fizyki Uniwersytetu Szczecińskiego.
6. J. Stelmach, ,,Influence of Exotic Forms of Matter on Evolution of the Universe and on Astrophysical Formulae“, Listopad 1993, Katedra Fizyki Uniwersytetu Szczecińskiego.
7. J. Stelmach, ,,Angular Diameters of Sources in the Einstein-Cartan Cosmology“, Grudzień 1993, Katedra Fizyki Uniwersytetu Szczecińskiego.
8. J. Stelmach, ,,Large-Angular-Scale Anisotropies of the Cosmic Microwave Background in the Universe with Exotic Matter“, Grudzień 1994, Katedra Fizyki Uniwersytetu Szczecińskiego.
9. J. Stelmach, ,,Comment on the Hubble Horizon in the Theory of Galaxy Formation“, Grudzień 1994, Katedra Fizyki Uniwersytetu Szczecińskiego.
10. J. Stelmach i Z. Sekulski, “Introduction to Computer Simulation of the Large Scale Structure Formation in the Universe. Particle-Particle Method “,Grudzień 1995, Katedra Fizyki Uniwersytetu Szczecińskiego.
11. J. Stelmach, “Large-Scale Structure Formation in the Universe with smoothly Distributed nonrelativistic Dark Matter using computer Modelling with Poisson Type Initial Condition“, December 1996, Institute of Physics.
12. J. Stelmach, ,,Force softening and energy testing in computer simulations of large structure formation in the Universe“ ,Grudzień 1998, Katedra Fizyki Uniwersytetu Szczecińskiego.
13. J. Stelmach, ,,Is there chaos in many-body systems?“, Czerwiec 1999, Katedra Fizyki Uniwersytetu Szczecińskiego (referat wygłoszony na międzynarodowej konferencji ,,Chaos in Dynamical Systems“ – Międzyzdroje 99).
14. J. Stelmach, ,,Second Law of Thermodynamics and Formation of Complex Structures in the Universe“, Październik 1999, Katedra Fizyki Uniwersytetu Szczecińskiego (referat wygłoszony na międzynarodowej konferencji ,,Cosmic Ecology and Noosphere“ – Partenit, Krym 1999).