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First measurement of gravitational lensing by cosmic voids in SDSS

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arxiv 1309.2045 v2 pith:NC5XYJCW submitted 2013-09-09 astro-ph.CO

First measurement of gravitational lensing by cosmic voids in SDSS

Peter Melchior , P. M. Sutter , Erin S. Sheldon , Elisabeth Krause , Benjamin D. Wandelt This is my paper
classification astro-ph.CO
keywords voidcosmiclensingvoidsdepressionfirstgravitationalmatter
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We report the first measurement of the diminutive lensing signal arising from matter underdensities associated with cosmic voids. While undetectable individually, by stacking the weak gravitational shear estimates around 901 voids detected in SDSS DR7 by Sutter et al. (2012a), we find substantial evidence for a depression of the lensing signal compared to the cosmic mean. This depression is most pronounced at the void radius, in agreement with analytical models of void matter profiles. Even with the largest void sample and imaging survey available today, we cannot put useful constraints on the radial dark-matter void profile. We invite independent investigations of our findings by releasing data and analysis code to the public at https://github.com/pmelchior/void-lensing

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  1. Cosmic voids evolution in modified gravity via hydrodynamics

    astro-ph.CO 2026-02 conditional novelty 6.0

    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.