Counting voids to probe dark energy

  title={Counting voids to probe dark energy},
  author={Alice Pisani and Paul Sutter and Nico Hamaus and Esfandiar Alizadeh and Rahul Biswas and Benjamin D. Wandelt and Christopher M. Hirata},
  journal={Physical Review D},
We show that the number of observed voids in galaxy redshift surveys is a sensitive function of the equation of state of dark energy. Using the Fisher matrix formalism we find the error ellipses in the $w_0-w_a$ plane when the equation of state of dark energy is assumed to be of the form $w_{CPL}(z)=w_0 +w_a z/(1+z)$. We forecast the number of voids to be observed with the ESA Euclid satellite and the NASA WFIRST mission, taking into account updated details of the surveys to reach accurate… 

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