LEAP 2013 Uppsala SE

Sensitive tests of CPT and Lorentz symmetry performed at presently accessible energy scales provide the opportunity to probe Planck-scale physics. The gravitational Standard-Model Extension (SME) provides a comprehensive theoretical framework for these investigations. Gravitational couplings in the SME yield implications for antimatter-gravity experiments. A general theoretical overview of...

The AEgIS experiment at CERN's AD aims at performing the first measurement of the gravitational interaction of antimatter. This will allow to expand tests of Einstein's Weak Equivalence Principle to antimatter systems. Such tests have initially been attempted with antiprotons and failed due to uncontrollable stray electric fields. The advances over the past decade in forming cold antihydrogen...

Resonant transitions between gravitational quantum states of antihydrogen near material surface can be induced by weak alternating magnetic field. Such an approach opens an opportunity for precision meausrement of energy spacing between quantum gravitational states and thus determination of antihydrogen gravitational mass. Behavior of antihydrogen atom near material surface in gravitational...

The Einstein classical Weak Equivalence Principle states that the trajectory of a particle is independent of its composition and internal structure when it is only submitted to gravitational forces. This fundamental principle has never been directly tested with antimatter. However, theoretical models such as supergravity may contain components inducing repulsive gravity thus violating this...

ALPHA has searched for a propensity for antihydrogen atoms to fall downward when released from the ALPHA trap. We find that we can reject ratios of the gravitational to inertial mass of antihydrogen greater than approximately 100 at a statistical significance level of 5%. A similar search places somewhat tighter bounds on a negative gravitational mass, i.e., on antigravity. The technique...

for the AEgIS collaboration. Antihydrogen holds the promise to test, for the first time, the universality of free-fall with a system composed entirely of antiparticles. The AEgIS experiment at CERN’s antiproton decelerator aims to measure the gravitational interaction between matter and antimatter by measuring the deflection of a beam of antihydrogen in the Earth’s gravitational field...