105 citations · 707 across the 36 of their papers we have counts for
5 papers · 1 filter
Galaxy clusters and structure formation in quintessence versus phantom dark energy universe
Zacharias Roupas, Minos Axenides, George Georgiou +1
The self-gravitating gas in the Newtonian limit is studied in the presence of dark energy with a linear and constant equation of state. Entropy extremization associates to the isot…
Gravitational-thermodynamic instabilities of isothermal spheres in dS and AdS
Zacharias Roupas
Thermodynamical stability of fluid spheres is studied in the presence of a cosmological constant, both in the Newtonian limit, as well as in General Relativity. In all cases, an in…
Gravothermal instability with a cosmological constant in the canonical ensemble
Minos Axenides, George Georgiou, Zacharias Roupas
We present here how the gravothermal or Antonov's instability, which was originally formulated in the microcanonical ensemble, is modified in the presence of a cosmological constan…
Gravitational instabilities of isothermal spheres in the presence of a cosmological constant
Minos Axenides, George Georgiou, Zacharias Roupas
Gravitational instabilities of isothermal spheres are studied in the presence of a positive or negative cosmological constant, in the Newtonian limit. In gravity, the statistical e…
Thermodynamical instabilities of perfect fluid spheres in General Relativity
Zacharias Roupas
For a static, perfect fluid sphere with a general equation of state, we obtain the relativistic equation of hydrostatic equilibrium, namely the Tolman-Oppenheimer-Volkov equation,…