A dark energy model alternative to generalized Chaplygin gas
  We propose a new fluid model of dark energy for $-1 \leq \omega_{\text{eff}}
\leq 0$ as an alternative to the generalized Chaplygin gas models. The energy
density of dark energy fluid is severely suppressed during barotropic matter
dominant epochs, and it dominates the universe evolution only for eras of small
redshift. From the perspective of fundamental physics, the fluid is a tachyon
field with a scalar potential flatter than that of power-law decelerated
expansion. Different from the standard $\Lambda\text{CDM}$ model, the suggested
dark energy model claims that the cosmic acceleration at present epoch can not
continue forever but will cease in the near future and a decelerated cosmic
expansion will recover afterwards.
