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Gravity, antimatter and the Dirac-Milne universe

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Abstract

We review the main arguments against antigravity, a different acceleration of antimatter relative to matter in a gravitational field, discussing and challenging Morrison’s, Good’s and Schiff’s arguments. Following Price, we show that, very surprisingly, the usual expression of the Equivalence Principle is violated by General Relativity when particles of negative mass are supposed to exist, which may provide a fundamental explanation of MOND phenomenology, obviating the need for Dark Matter. Motivated by the observation of repulsive gravity under the form of Dark Energy, and by the fact that our universe looks very similar to a coasting (neither decelerating nor accelerating) universe, we study the Dirac-Milne cosmology, a symmetric matter-antimatter cosmology where antiparticles have the same gravitational properties as holes in a semiconductor. Noting the similarities with our universe (age, SN1a luminosity distance, nucleosynthesis, CMB angular scale), we focus our attention on structure formation mechanisms, finding strong similarities with our universe. Additional tests of the Dirac-Milne cosmology are briefly reviewed, and we finally note that a crucial test of the Dirac-Milne cosmology will be soon realized at CERN next to the ELENA antiproton decelerator, possibly as early as fall 2018, with the AEgIS, ALPHA-g and Gbar antihydrogen gravity experiments.

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Authors and Affiliations

  1. CNRS, 3 rue Michel-Ange, F-75016, Paris, France

    Gabriel Chardin

  2. Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67000, Strasbourg, France

    Giovanni Manfredi

Authors
  1. Gabriel Chardin
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  2. Giovanni Manfredi
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Correspondence to Gabriel Chardin.

Additional information

This article is part of the Topical Collection on Proceedings of the 13th International Conference on Low Energy Antiproton Physics (LEAP 2018) Paris, France, 12–16 March 2018

Edited by Paul Indelicato, Dirk van der Werf and Yves Sacquin

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Chardin, G., Manfredi, G. Gravity, antimatter and the Dirac-Milne universe. Hyperfine Interact 239, 45 (2018). https://doi.org/10.1007/s10751-018-1521-3

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