title: Description and first application of a new technique to measure the gravitational mass of antihydrogen.
abstract: Physicists have long wondered whether the gravitational interactions between matter and antimatter might be different from those between matter and itself. Although there are many indirect indications that no such differences exist and that the weak equivalence principle holds, there have been no direct, free-fall style, experimental tests of gravity on antimatter. Here we describe a novel direct test methodology; we search for a propensity for antihydrogen atoms to fall downward when released from the ALPHA antihydrogen trap. In the absence of systematic errors, we can reject ratios of the gravitational to inertial mass of antihydrogen >75 at a statistical significance level of 5%; worst-case systematic errors increase the minimum rejection ratio to 110. A similar search places somewhat tighter bounds on a negative gravitational mass, that is, on antigravity. This methodology, coupled with ongoing experimental improvements, should allow us to bound the ratio within the more interesting near equivalence regime.
authors: A E
authors: AE
authors: Charman
authors: C
authors: C
authors: Amole
authors: M D
authors: MD
authors: Ashkezari
authors: M
authors: M
authors: Baquero-Ruiz
authors: W
authors: W
authors: Bertsche
authors: E
authors: E
authors: Butler
authors: A
authors: A
authors: Capra
authors: C L
authors: CL
authors: Cesar
authors: M
authors: M
authors: Charlton
authors: S
authors: S
authors: Eriksson
authors: J
authors: J
authors: Fajans
authors: T
authors: T
authors: Friesen
authors: M C
authors: MC
authors: Fujiwara
authors: D R
authors: DR
authors: Gill
authors: A
authors: A
authors: Gutierrez
authors: J S
authors: JS
authors: Hangst
authors: W N
authors: WN
authors: Hardy
authors: M E
authors: ME
authors: Hayden
authors: C A
authors: CA
authors: Isaac
authors: S
authors: S
authors: Jonsell
authors: L
authors: L
authors: Kurchaninov
authors: A
authors: A
authors: Little
authors: N
authors: N
authors: Madsen
authors: J T K
authors: JT
authors: McKenna
authors: S
authors: S
authors: Menary
authors: S C
authors: SC
authors: Napoli
authors: P
authors: P
authors: Nolan
authors: A
authors: A
authors: Olin
authors: P
authors: P
authors: Pusa
authors: C Ø
authors: CØ
authors: Rasmussen
authors: F
authors: F
authors: Robicheaux
authors: E
authors: E
authors: Sarid
authors: D M
authors: DM
authors: Silveira
authors: C
authors: C
authors: So
authors: R I
authors: RI
authors: Thompson
authors: D P
authors: DP
authors: van der Werf
authors: J S
authors: JS
authors: Wurtele
authors: A I
authors: AI
authors: Zhmoginov
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