Constraining Dark Energy With Stacked Concave Lenses

Understand

Low density regions are less affected by the nonlinear structure formation and baryonic physics.

• They are ideal places for probing the nature of dark energy, a possible explanation for the cosmic acceleration.
• Unlike void lensing, which requires identifications of individual voids, we study the stacked lensing signals around the low-density-positions (LDP), defined as places that are devoid of foreground bright galaxies in projection.
• The method allows a direct comparison with numerical results by drawing correspondence between the bright galaxies with halos.