  A particular generalization of the Chaplygin inflationary model, using the
formalism of Hamilton-Jacobi and elliptic functions, results in a more general
non-linear Chaplygin-type equation of state (Chaplygin-Jacobi model). We
investigate the implementation of this model as a dark energy (DE) fluid to
explain the recent acceleration of the universe. Unlike $\Lambda$CDM and other
Chaplygin-like fluids, where the final fate of the universe is an eternal de
Sitter (dS) phase, the dynamics of this model allow for the possibility of a
decelerating phase in the future, following the current accelerating phase. In
other words, a transient acceleration arises, accounting for the recently
claimed slowing down phenomenon. This Chaplygin-Jacobi model shows important
differences compared to the standard and generalized Chaplygin gas models.
Additionally, we perform a Markov Chain Monte Carlo (MCMC) analysis using
several datasets, including Type Ia Supernovae (SnIa), Cosmic Chronometers
(CC), and Fast Radio Bursts (FRBs), to examine the observational viability of
the model. Our results indicate that a transient phase of accelerated expansion
is not excluded by current observations.
