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In cosmology, Gurzadyan-Savvidy (GS) relaxation is a theory developed by Vahe Gurzadyan and George Savvidy to explain the relaxation over time of the dynamics of N-body gravitating systems such as star clusters and galaxies. Stellar systems observed in the Universe – globular clusters and elliptical galaxies – reveal their relaxed state reflected in the high degree of regularity of some of their physical characteristics such as surface luminosity, velocity dispersion, geometric shapes, etc. The basic mechanism of relaxation of stellar systems has been considered the 2-body encounters, to lead to the observed fine-grained equilibrium. The coarse-grained phase of evolution of gravitating systems is described by violent relaxation developed by Donald Lynden-Bell. The 2-body mechanism of relaxation is known in plasma physics. The difficulties with description of collective effects in N-body gravitating systems arise due to the long-range character of gravitational interaction, as distinct of plasma where due to two different signs of charges the Debye screening takes place. The 2-body relaxation mechanism e.g. for elliptical galaxies predicts around years i.e. time scales exceeding the age of the Universe. The problem of relaxation and evolution of stellar systems and the role of collective effects are studied by various techniques, see. Among the efficient methods of study of N-body gravitating systems are the numerical simulations, particularly, Sverre Aarseth's N-body codes are widely used.
Rosa Amelia González-Lópezlira is a Mexican astronomer specializing in galaxy formation and evolution, the age distribution of stars in different regions of galaxies, and the rotation rate of globular clusters in galaxies, including the discovery of an anomalously fast rotation rate in Messier 106. She is a researcher at the National Autonomous University of Mexico (UNAM), in the UNAM Institute of Radio Astronomy and Astrophysics.
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References
- ↑ Aarseth, A. J. (2012). "Mergers and ejections of black holes in globular clusters". Monthly Notices of the Royal Astronomical Society . 422 (1): 841–848. arXiv: 1202.4688 . Bibcode:2012MNRAS.422..841A. doi:10.1111/j.1365-2966.2012.20666.x. S2CID 62826586.
- ↑ Institute for Advanced Study: A Community of Scholars
- ↑ "List of Brouwer Award Winners". American Astronomical Society . Retrieved 27 June 2012.
- ↑ "Sverre's Interests". Institute of Astronomy, Cambridge. Retrieved 27 June 2012.
- ↑ "International Correspondence Chess Federation International Masters" (PDF). International Correspondence Chess Federation. November 2011. Archived from the original (PDF) on 6 March 2021. Retrieved 27 June 2012.
