Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.218a1002.&link_type=abstract
Journal of Physics: Conference Series, Volume 218, Issue 1, pp. 011002 (2010).
Physics
Scientific paper
This conference proceedings is dedicated to the memory of our colleague and friend Péter Csizmadia a young physicist, a computer expert and one of the best Hungarian mountaineers who has been missing since the end of October 2009 and whose last scientific presentation occurred during the 5th Workshop of Young Researchers in Astronomy and Astrophysics, 2-4 September 2009, Budapest.
Péter Csizmadia
Péter Csizmadia 1972-2009
The accident: Péter Csizmadia, along with three other young Hungarian mountaineers (Kata Tolnay, Vera Mikolovits, and Balázs Pechtol) disappeared in China's Sichuan region near the Ren Zhong Feng peak of the Himalayas, in the early morning of 23 October 2009. A huge part of a glacier fell, resulting in an extraordinary ice and stone avalanche that covered the valley where they had their camp for the night. Neither their bodies nor their belongings were found by the ground and helicopter rescue teams.
A brief CV: Péter Csizmadia was born in 1972. He received an MSc in physics (1996) and a PhD in heavy ion physics (2003) both of these degrees were issued by Eötvös University (Budapest, Hungary). At the beginning of his career his main research interest was centred around quark hadronization (1995-2005). Later he joined the relativity group of RMKI and worked on numerical simulations in general relativity, investigating problems such as cosmological inflation and gravitational collapse in general relativity (2005-2009).
In 2005, Péter joined to our relativity group and started to work on the first version of a high precision adaptive mesh refinement (AMR) code, called GridRipper. He was the founder and he remained the main developer of GridRipper until his disappearance. Due to his efforts GridRipper became a fourth order precision AMR code implemented as C++/Java classes for solving hyperbolic systems of partial differential equations numerically. The already implemented and tested applications include the study of various dynamical systems such as cosmological inflation, gravitational collapse of spherically symmetric systems, the production and evolution of micro black holes and topology changes. The code is capable of solving hyperbolic partial differential equations (PDE) with any of the usually implemented integration schemes such as second or fourth order Runge-Kutta, Iterated Crank-Nicholson or Lax-Wendroff. The initial data may be given by analytic expressions, by a set of elliptic equations or by numerical data provided by an independent code. The analytic and numerical methods applied in developing GridRipper are unique in the sense that this code - foremost in the World - is capable of following the time evolution inside the black hole region approaching the developing singularity arbitrarily close (see http://www.kfki.hu/~cspeter/numrel/2009-ekg/index.html).
In the meantime András László joined us, and we started to develop GridRipper jointly such that Péter's expertise played a fundamental role in all the new developments. The initial version of GridRipper was suitable for studying only spherically symmetric systems as it was a 1+1 dimensional version. The new version of GridRipper is applicable to generic systems living in 1+N dimensional spacetimes in which the angular degrees of freedom are treated by spectral methods. The effectiveness of the applied method is justified by the fact that simulations that usually require supercomputer background for other methods can be carried out on average PCs by GridRipper.
It was in fact the year 2009 when we reached the desired success, and signs of the true pay-back for the energy invested started to appear. The unexpected disappearance of Péter in China happened when a natural increase of interest within the numerical relativity community became visible. András and I have decided to keep it alive and, if possible, develop GridRipper further, the foundations of which could not be laid without Péter's expertise. This decision is supported not only by the fact that we had the chance to work together with a physicist possessing outstanding programming capabilities, but also because we got to know in Péter a remarkably nice person and a good friend. Peter was always cheerful and ready for discussions or to provide support to anybody who asked for his help. With the loss of Péter we all lost an exceptional colleague and a true friend.
István Rácz
Recent publications of Péter Csizmadia
Csizmadia P and Lévai P 2005 Energy dependence of transverse quark flow in heavy ion collisions Acta Physica Hungarica A22 371-380
Csizmadia P, 2006 Testing a new mesh refinement code in the evolution of a spherically symmetric Klein-Gordon field International Journal of Modern Physics D15 107-119
Csizmadia P 2007 Fourth order AMR and nonlinear dynamical systems in compactified space Class. Quantum Grav. 24 S369
Hamar G, Zhu L L, Csizmadia P, Lévai P 2008The robustness of quasiparticle coalescence in quark matter European Physical Journal Special Topics 155 67-74
Hamar G, Zhu L L, Csizmadia P, Lévai P 2008 Strange hadron yields and ratios in heavy ion collisions at RHIC energy J. Phys. G: Nucl. Part. Phys. 35 044067
Csizmadia P and Rácz I 2008 On the cosmological relevance of oscillons, Poster at the Frontiers in Numerical Gravitational Astrophysics Summer School, Erice, Italy, June 27-July 5
Csizmadia P, Rácz I 2010 Gravitational collapse and topology change in spherically symmetric dynamical systems Class. Quantum Grav. 27 015001
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