Abstract The Antiproton Decelerator (AD) facility of CERN began operation in 1999 to serve
experiments for studies of CPT invariance by precision laser and microwave spectroscopy of …

The hydrogen atom continues to be a testbench for a wide variety of fundamental physical
measurements, whose scope has been expanded to the hydrogen-like atoms positronium …

The spectrum of the hydrogen atom has played a central part in fundamental physics over
the past 200 years. Historical examples of its importance include the wavelength …

Antimatter was first predicted in 1931, by Dirac. Work with high-energy antiparticles is now
commonplace, and anti-electrons are used regularly in the medical technique of positron …

Atoms made of a particle and an antiparticle are unstable, usually surviving less than a
microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is …

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 …

The gravitational couplings of matter are studied in the presence of Lorentz and CPT
violation. At leading order in the coefficients for Lorentz violation, the relativistic quantum …

The principle of the equivalence of gravitational and inertial mass is one of the cornerstones
of general relativity. Considerable efforts have been made and are still being made to verify …

We describe here efforts to create and study magnetized electron–positron pair plasmas, the
existence of which in astrophysical environments is well-established. Laboratory …

We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in
plasmas with measured temperature as low as 9 K. We have modeled the evaporation …