Dark Energy

The size of the boundary between a structure of a given mass and the surrounding expanding universe encodes the presence, dominance, and evolution of dark energy. This is a new observable, independent to the ones already used to constrain dark energy (such as the Hubble expansion rate history). Unlike observables already in use that measure the impact of dark energy on the Universe as a whole, this new probe reflects the effect of dark energy locally, on cluster scales, and at a specific redshift.

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Selected Publications: 

• Mass scaling relations for dark halos from an analytic universal outer density profile,
  Korkidis & Pavlidou 2024 preprint

• Turnaround density evolution encodes cosmology in simulations,
  Korkidis, Pavlidou & Tassis 2024, A&A

• Turnaround density as a probe of the cosmological constant,
  Pavlidou et al. 2020 A&A

• Turnaround radius of galaxy clusters in N-body simulations,
  Korkidis et al 2020 A&A

• Where the world stands still: turnaround as a strong test of ΛCDM cosmology
  Pavlidou & Tomaras 2014, JCAP