Anisotropic $2$-form dark energy
  We study the dynamics of dark energy in the presence of a 2-form field
coupled to a canonical scalar field $\phi$. We consider the coupling
proportional to $e^{-\mu \phi/M_{\rm pl}} H_{\alpha \beta \gamma}H^{\alpha
\beta \gamma}$ and the scalar potential $V(\phi) \propto e^{-\lambda
\phi/M_{\rm pl}}$, where $H_{\alpha \beta \gamma}$ is the 2-form field
strength, $\mu, \lambda$ are constants, and $M_{\rm pl}$ is the reduced Planck
mass. We show the existence of an anisotropic matter-dominated scaling solution
followed by a stable accelerated fixed point with a non-vanishing shear. Even
if $\lambda \geq {\cal O}(1)$, it is possible to realize the dark energy
equation of state $w_{\rm DE}$ close to $-1$ at low redshifts for $\mu \gg
\lambda$. The existence of anisotropic hair and the oscillating behavior of
$w_{\rm DE}$ are key features for distinguishing our scenario from other dark
energy models like quintessence.
