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  1. Article

    Open Access

    Observation of the effect of gravity on the motion of antimatter

    Einstein’s general theory of relativity from 19151 remains the most successful description of gravitation. From the 1919 solar eclipse2 to the observation of gravitational waves3, the theory has passed many cruci...

    E. K. Anderson, C. J. Baker, W. Bertsche, N. M. Bhatt, G. Bonomi, A. Capra… in Nature (2023)

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  2. Article

    Open Access

    Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production

    The positron, the antiparticle of the electron, predicted by Dirac in 1931 and discovered by Anderson in 1933, plays a key role in many scientific and everyday endeavours. Notably, the positron is a constituen...

    C. J. Baker, W. Bertsche, A. Capra, C. L. Cesar, M. Charlton… in Nature Communications (2021)

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  3. Article

    Open Access

    Laser cooling of antihydrogen atoms

    The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision1. Slowing the translational motion of atoms and io...

    C. J. Baker, W. Bertsche, A. Capra, C. Carruth, C. L. Cesar, M. Charlton… in Nature (2021)

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  4. No Access

    Article

    The GBAR antimatter gravity experiment

    The GBAR project (Gravitational Behaviour of Anti hydrogen at Rest) at CERN, aims to measure the free fall acceleration of ultracold neutral anti hydrogen atoms in the terrestrial gravitational field. The expe...

    P. Pérez, D. Banerjee, F. Biraben, D. Brook-Roberge, M. Charlton… in Hyperfine Interactions (2015)

  5. No Access

    Article

    Beam preparation for studying the gravitational behavior of antimatter at rest (GBAR)

    The specific antiproton- and positron-beam requirements of the CERN AD-7 experiment, GBAR (Gravitational Behavior of Antimatter at Rest) are presented. GBAR will synthesize antihydrogen ions which will be sympath...

    D. Lunney, P. Dupré, P. Grandemange, V. Manea, T. Mortensen… in Hyperfine Interactions (2014)

  6. No Access

    Article

    The Gbar project, or how does antimatter fall?

    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 funda...

    Paul Indelicato, G. Chardin, P. Grandemange, D. Lunney, V. Manea… in Hyperfine Interactions (2014)