AEgIS is a physics experiment that takes place at the european laboratory CERN, using the antiprotons delivered by the AD accelerator. AEgIS is a collaboration of physicists from all around the world.
The primary scientific goal of the AEgIS experiment is the direct measurement of the Earth’s gravitational acceleration g on antihydrogen. In the first phase of the experiment, a gravity measurement with 1% precision will be carried out by sending an antihydrogen beam through a classical Moire deflectometer coupled to a position sensitive detector. This will represent the first direct measurement of a gravitational effect on an antimatter system. aegis.web.cern.ch
Why We Already Know that Antihydrogen is Almost Certainly NOT Going to Fall “Up”
The ALPHA collaboration (of which I am a member) has made great strides recently in trapping antihydrogen[1, 2] and starting down the path of making spectroscopic measurements.
The primary goal of the experiment is to test CPT invariance but there is also interest in testing another fundamental issue – the gravitational interaction between matter and antimatter (the so-called question of “antigravity”).
As well as the other antihydrogen trapping experiments – ASACUSA and ATRAP – there is also a new experiment in the Antiproton Decelerator hall at CERN called AEGIS which is dedicated to testing the gravitional interaction between antihydrogen and the Earth. It was claimed in  that there “is no compelling evidence or theoretical reason to rule out such a diﬀerence (i.e., between g and ¯g) at the 1% level.”
I argue in this short paper that bending of light by the sun provides a more stringent limit than this2….
Read more: http://arxiv.org/pdf/1207.7358v1.pdf