Cosmological test of gravity using weak lensing voids

Understand

Modifications to General Relativity (GR) often incorporate screening mechanisms in order to remain compatible with existing tests of gravity.

• The screening is less efficient in underdense regions, which suggests that cosmic voids can be a useful cosmological probe for constraining modified gravity models.
• In particular, weak lensing by voids has been proposed as a promising test of such theories.
• Usually, voids are identified from galaxy distributions, making them biased tracers of the underlying matter field.