Zacharias Roupas

Email: Zacharias.Roupas at bue.edu.eg

Research Interests

My primary research activities belong to the general fields of Theoretical Astrophysics and Cosmology, Theory of Gravitation, Statistical Mechanics. They may be summarized as follows: statistical mechanics and thermodynamics of gravitational interaction, Newtonian and relativistic; stability, structure, and dynamics of relativistic compact stars; stellar and galaxy clusters, black hole subclusters, and the dark sector.

Selected Publications
  • Zacharias Roupas, "Gravitational Brownian motion as inhomogeneous diffusion: black hole populations in globular clusters", Astronomy and Astrophysics, 646, A20 (2021)
  • Zacharias Roupas, "Relativistic Gravothermal Instabilities", Classical and Quantum Gravity, 32, 135023 (2015)
  • Zacharias Roupas and Demosthenes Kazanas, "Generation of massive stellar black holes by rapid gas accretion in primordial dense clusters", Astronomy and Astrophysics, 632, L8 (2019)
  • Zacharias Roupas, "Statistical Mechanics of Gravitational Systems with Regular Orbits: Rigid Body Model of Vector Resonant Relaxation", Journal of Physics A: Mathematical and Theoretical, 53, 045002 (2020)
  • Zacharias Roupas, Bence Kocsis and Scott Tremaine, "Isotropic–Nematic Phase Transitions in Gravitational Systems", The Astrophysical Journal, 842, 90 (2017)
  • Zacharias Roupas, "Thermodynamical instabilities of perfect fluid spheres in General Relativity", Classical and Quantum Gravity, 30, 115018 (2013)
  • Zacharias Roupas, "Thermal Mass Limit of Neutron Cores", Physical Review D, 91, 023001 (2015)
  • Zacharias Roupas, “Gravitational Potential from Maximum Entropy Principle”, Classical and Quantum Gravity, 37, 097001, (2020)
  • Zacharias Roupas, Minos Axenides, George Georgiou, and Emmanuel N. Saridakis, "Galaxy clusters and structure formation in quintessence versus phantom dark energy Universe", Physical Review D, 89, 083002 (2014)
  • Zacharias Roupas, "Phase space geometry and chaotic attractors in dissipative Nambu mechanics", Journal of Physics A: Mathematical and Theoretical, 45, 195101 (2012)