Speaker
Jounghun Lee
Description
In my talk, it will be presented that the perpendicular alignments of void-surface galaxies can in principle be a powerful probe of the dynamic nature of dark energy (DE). Applying the Void-Finder algorithm to the AbacusSummit simulations performed for extensive ranges of DE cosmologies, we have numerically discovered that the shape axes of void-surface galactic halos tend to be perpendicularly aligned with the directions toward the void centers, and that the strengths of these perpendicular alignments of void-surface galactic halos sensitively depend on the DE amount and equation of state. Developing an effective bilinear model for this DE dependence, the validity of this model against several possible systematics has been proven.
| Research Area | Cosmology: late universe |
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Authors
GEONWOO KANG
(Seoul National University)
Jounghun Lee