Constraining Dark Energy through the Stability of Cosmic Structures
  For a general dark-energy equation of state, we estimate the maximum possible radius of massive structures that are not destabilized by the acceleration of the cosmological expansion. A comparison with known stable structures constrains the equation of state. The robustness of the constraint can be enhanced through the accumulation of additional astrophysical data and a better understanding of the dynamics of bound cosmic structures. 
V. Pavlidou, N. Tetradis, and T.N. Tomaras
astro-ph.CO gr-qc