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**From**: Bence Kocsis <bkocsis AT caesar.elte.hu>**To**: fizinfo AT lists.kfki.hu**Subject**: [Fizinfo] ELTE GALNUC Seminar**Date**: Tue, 10 Apr 2018 10:51:14 +0200

GALNUC Seminar

Tuesday, April 10, 2018, 4:00 p.m.

Eotvos Lagymanyos campus, Pazmany Peter s. 1/A, room 3.139

speaker: Adam Takacs (ELTE)

*Phase Transitions in Galactic Nuclei*

The gravitational interaction among bodies orbiting in a spherical

potential leads to the rapid relaxation of the orbital planes'

distribution, a process called vector resonant relaxation. In this talk I

will discuss the Hamiltonian and the statistical equilibrium of this

process. The equilibrium distribution resembles a counterrotating disk at

low temperature and a spherical structure at high temperature. The system

exhibits a first order phase transition between the disk and the spherical

phase in the canonical ensemble if the total angular momentum is below a

critical value. We find that the phase transition erases the high order

multipoles, i.e. small-scale structure in angular momentum space, most

efficiently. The system admits a maximum entropy and a maximum energy,

which lead to the existence of negative temperature equilibria

Everyone is welcome!

**[Fizinfo] ELTE GALNUC Seminar**,*Bence Kocsis, 04/10/2018*- <Possible follow-up(s)>
**[Fizinfo] ELTE GALNUC Seminar**,*Bence Kocsis, 04/23/2018*

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