CPC Seminar: A new probe of dark energy

  • Nov. 8, 2021, 2:00 pm US/Central
  • Vasiliki Pavlidou, University of Crete

Abstract: In the currently favored cosmological model, the energy density of the Universe is dominated by a field of unknown nature – dark energy –  acting anti-gravitationally. All our current evidence for the existence of dark energy, whether in the form of a cosmological constant or an evolving field, is indirect and global (based on the effect of dark energy on the Universe as a whole). I will discuss a novel path towards probing dark energy, using galaxy clusters on their largest non-expanding scales. I will show how measurements of the mass enclosed by the boundary between galaxy clusters and the expanding Universe can directly and uniquely probe dark energy locally: on scales much smaller than the observable Universe, and at the present cosmic time.


Zoom: https://fermipoint.fnal.gov/service/seminars