Post-Newtonian Hamiltonian description of an atom in a weak gravitational field
arXiv:1908.06929 · doi:10.1103/PhysRevA.100.052116
Abstract
We extend the systematic calculation of an approximately relativistic Hamiltonian for centre of mass and internal dynamics of an electromagnetically bound two-particle system by Sonnleitner and Barnett [1] to the case including a weak post-Newtonian gravitational background field, described by the Eddington--Robertson parametrised post-Newtonian metric. Starting from a proper relativistic description of the situation, this approach allows to systematically derive the coupling of the model system to gravity, instead of `guessing' it by means of classical notions of relativistic effects. We embed this technical result into a critical discussion concerning the problem of implementing and interpreting general couplings to the gravitational field and the connected problem of how to properly address the question concerning the validity of the Equivalence Principle in Quantum Mechanics.
arXiv comment27+4+3 pages (main text, appendix, and references), to be published in Physical Review A. Differences to v1: added references, extended conclusions, corrected typos
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