Symmetron dark energy in laboratory experiments
  The symmetron scalar field is a matter-coupled dark energy candidate which
effectively decouples from matter in high-density regions through a symmetry
restoration. We consider a previously unexplored regime, in which the vacuum
mass $\mu \sim 2.4\times 10^{-3}$ eV of the symmetron is near the dark energy
scale, and the matter coupling parameter $M \sim 1$ TeV is just beyond Standard
Model energies. Such a field will give rise to a fifth force at submillimeter
distances which can be probed by short-range gravity experiments. We show that
a torsion pendulum experiment such as E\"ot-Wash can exclude symmetrons in this
regime for all self-couplings $\lambda \lesssim 7.5$.
