  We study emergent behaviors of the Lohe hermitian sphere(LHS) model with a
time-delay for a homogeneous ensemble. The LHS model is a complex counterpart
of the Lohe sphere(LS) aggregation model on the unit sphere in Euclidean space,
and it describes the aggregation of particles on the unit hermitian sphere in
$\mathbb{C}^d$ with $d \geq 2$, Recently it has been introduced by two authors
of this work as a special case of the Lohe tensor model [23]. When the coupling
gain pair satisfies a specific linear relation, namely the Stuart-Landau(SL)
coupling gain pair, it can be embedded into the LS model on $\mathbb{R}^{2d}$.
In this work, we show that if the coupling gain pair is close to the SL
coupling pair case, the dynamics of the LHS model exhibits an emergent
aggregate phenomenon via the interplay between time-delayed interactions and
nonlinear coupling between states. For this, we present several frameworks for
complete aggregation and practical aggregation in terms of initial data and
system parameters using the Lyapunov functional approach.
