Violations of Einstein’s Equivalence Principle for Macroscopic Quantum Bodies

Different macroscopic ensembles of the hydrogen atoms are considered in an external gravitational field using the so-called weak field approximation. We demonstrate that these ensembles can be subdivided into two big groups with completely different gravitational properties. For the majority of them the Einstein’s Equivalence Principle is fulfilled, whereas for some special ensembles [1] (which we call “Gravitational demons”) the Equivalence Principle is broken for the both passive and active gravitational masses. We discuss [2] if it is possible or not to create the latter ensembles in some laboratories in the Earth and how to discover the violations of the Einstein’s Equivalence Principle. [1] A.G. Lebed, Editor, Breakdown of Einstein’s Equivalence Principle (World Scientific, Singapore, 2023). [2] A.G. Lebed, Amer. Inst. of Phys., Conf. Proc. 2872, 120048 (2023).