The small-scale residual velocity field for these structures has high coherence and low magnitude.
A method of analyzing these entities begins by finding maxima of the displacement field divergence in Lagrangian coordinates. The SDSS used an algorithm proposed by Hoyle and Vogeley to find these objects that begins by using a nearest neighbor algorithm on galaxies, which are represented by vertices. These structures correspond to primordial clouds with three negative eigenvalues of the deformation tensor. The small-scale residual velocity field for these structures has high coherence and low magnitude. The dark energy equation of state is constrained by the evolution of these structures' ellipticity. Robert Kirshner discovered a major example of these structures that is located in the constellation Boötes. Because the late-time integrated Sachs-Wolfe effect causes these structures to decrease the local CMB temperature, the WMAP cold spot may correspond to an exceptionally large one that is called Eridanus. For 10 points, name these regions of the universe that have very low matter density.
A method of analyzing these entities begins by finding maxima of the displacement field divergence in Lagrangian coordinates.
cosmic voids [accept supervoids]