Speaker
Description
Within present observational uncertainties, the time evolution of dark
energy discovered by DESI (2025) is consistent with a simple model in
which the dark energy density maintains a direct dependence on the
${\mid \Omega - 1 \mid}$ measure of spatial curvature. This, together
with Bousso’s (2002) conjecture that the holographic bound of the
universe saturates at the observer’s apparent horizon, and Gibbons &
Hawking’s (1977) postulate that the cosmological event horizon in de
Sitter space is fully physically equivalent to an inverted event
horizon of a Schwarzschild black hole of identical surface area,
predicts with surprising accuracy both the strength and change in dark
energy. A notable feature of this model is that ${\rho_{DE}}$ remains
small as long as space remains nearly flat, and ${\rho_{DE}}$ acts to
re-flatten space if ${\Omega}$ ever deviates significantly from unity.
