title: ASTROPHYSICS. Atom-interferometry constraints on dark energy.
abstract: If dark energy, which drives the accelerated expansion of the universe, consists of a light scalar field, it might be detectable as a "fifth force" between normal-matter objects, in potential conflict with precision tests of gravity. Chameleon fields and other theories with screening mechanisms, however, can evade these tests by suppressing the forces in regions of high density, such as the laboratory. Using a cesium matter-wave interferometer near a spherical mass in an ultrahigh-vacuum chamber, we reduced the screening mechanism by probing the field with individual atoms rather than with bulk matter. We thereby constrained a wide class of dark energy theories, including a range of chameleon and other theories that reproduce the observed cosmic acceleration.
authors: Department of Physics, 366 Le Conte Hall MS 7300, University of California-Berkeley, Berkeley, CA 94720, USA.
authors: P
authors: P
authors: Hamilton
authors: Department of Physics, 366 Le Conte Hall MS 7300, University of California-Berkeley, Berkeley, CA 94720, USA.
authors: M
authors: M
authors: Jaffe
authors: Department of Physics, 366 Le Conte Hall MS 7300, University of California-Berkeley, Berkeley, CA 94720, USA.
authors: P
authors: P
authors: Haslinger
authors: Department of Physics, 366 Le Conte Hall MS 7300, University of California-Berkeley, Berkeley, CA 94720, USA.
authors: Q
authors: Q
authors: Simmons
authors: Department of Physics, 366 Le Conte Hall MS 7300, University of California-Berkeley, Berkeley, CA 94720, USA. Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA. hm@berkeley.edu.
authors: H
authors: H
authors: Müller
authors: Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA.
authors: J
authors: J
authors: Khoury