# Constraining the Dark Energy Equation of State with Cosmic Voids

## TL;DR

This paper proposes that the evolution of cosmic void shapes can serve as a sensitive probe for constraining the dark energy equation of state, enhancing understanding of the universe's acceleration.

## Contribution

It analytically demonstrates the sensitivity of cosmic void ellipticity evolution to the dark energy equation of state within a flat universe model.

## Key findings

- Void ellipticity evolution depends on dark energy properties
- Parameter degeneracy between w and Omega_m discussed
- Analytical framework established for using voids as cosmological probes

## Abstract

Our universe is observed to be accelerating due to the dominant dark energy with negative pressure. The dark energy equation of state (w) holds a key to understanding the ultimate fate of the universe. The cosmic voids behave like bubbles in the universe so that their shapes must be quite sensitive to the background cosmology. Assuming a flat universe and using the priors on the matter density parameter (Omega_m) and the dimensionless Hubble parameter (h), we demonstrate analytically that the ellipticity evolution of cosmic voids may be a sensitive probe of the dark energy equation of state. We also discuss the parameter degeneracy between w and Omega_m.