Speaker
Naoto Maki
Description
We explain the data of the DESI galaxy survey by
using theoretical models of time-varying dark energy. Among such
models, a quintessence field with the exponential potential is an
attractive candidate for inducing time-varying dark energy. We
analytically derive constraints on initial conditions that allow the
kination epoch in the early Universe without conflicting with big
bang nucleosynthesis. Compared to the severe 120-digit fine-tuning
required for dark energy to be a cosmological constant, our result
shows that the degree of fine-tuning is naturally relaxed by dozens
of orders of magnitude. Furthermore, we discuss the method for
testing this model through future observations of the gravitational
wave background.
