Constraining dark energy from the abundance of weak gravitational lenses

  title={Constraining dark energy from the abundance of weak gravitational lenses},
  author={Nevin N. Weinberg and Marc Kamionkowski},
  journal={Monthly Notices of the Royal Astronomical Society},
We examine the prospect of using the observed abundance of weak gravitational lenses to constrain the equation-of-state parameter w = p /p of dark energy. Dark energy modifies the distance-redshift relation, the amplitude of the matter power spectrum, and the rate of structure growth. As a result, it affects the efficiency with which dark-matter concentrations produce detectable weak-lensing signals. Here we solve the spherical-collapse model with dark energy, clarifying some ambiguities found… 
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