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Lensing Measurements of the Mass Distribution in SDSS Voids
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We measure weak lensing mass profiles of voids from a volume-limited sample of SDSS Luminous Red Galaxies (LRGs). We find voids using an algorithm designed to maximize the lensing signal by dividing the survey volume into 2D slices, and then finding holes in this 2D distribution of LRGs. We perform a stacked shear measurement on about 20,000 voids with radii between 15-55 Mpc/h and redshifts between 0.16-0.37. We measure the characteristic radial shear signal of voids with a signal-to-noise of 7. The mass profile corresponds to a fractional underdensity of about -0.4 inside the void radius and a slow approach to the mean density indicating a partially compensated void structure. We compare our measured shape and amplitude with the predictions of Krause et al 2013. Voids in the galaxy distribution have been extensively modeled using simulations and measured in the SDSS. We discuss how the addition of void mass profiles can enable studies of galaxy formation and cosmology.
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Cited by 2 Pith papers
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Why Cosmic Voids Matter: Pristine Evolution
Cosmic voids traced by halos become stable at late times, and the matter around them evolves linearly, supporting their use as clean dark-energy probes.
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Cosmic voids evolution in modified gravity via hydrodynamics
Voids in luminal Galileon gravity are always unscreened, and a reality requirement on the fifth force rules out ~82% of the favored parameter space, yielding a redshift-dependent minimum void depth.
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