Braneworld cosmology in the sourced-Taub background
  A new braneworld in the sourced-Taub background is proposed. The gravity
field equations in the internal source region and external vacuum region are
investigated, respectively. We find that the equation of state for the
effective dark energy of a dust brane in the source region can cross the
phantom divide $w=-1$. Furthermore, there is a drop on $H(z)$ diagram, which
presents a possible mechanism for the recent direct data of $H(z)$.
