Symmetron dark energy in laboratory experiments

Abstract

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 Eöt-Wash can exclude symmetrons in this regime for all self-couplings $\lambda \lesssim 7.5$.

4 pages, 2 figures. Matches version accepted by PRL

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