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Nonunitary Newtonian Gravity Makes Semiclassical Gravity Viable for All Practical Purposes

Quantum Physics 2018-11-28 v4

Abstract

Semiclassical Gravity replaces the energy momentum tensor TμνT_{\mu \nu} with its expectation value Tμν\langle T_{\mu \nu}\rangle in Einstein equations, this making the Einstein tensor GμνG_{\mu \nu} a classical variable thus avoiding the quantization of the gravitational field. Jointly with the Copenhagen interpretation of QM, Semiclassical Gravity gives rise to cases of Superluminal Communication. It is shown in a specific instance that a model of Nonunitary Newtonian Gravity avoids Superluminal Communication by decohering linear superpositions of macroscopically distinct states, namely Schrodinger's cats.

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Cite

@article{arxiv.1807.10469,
  title  = {Nonunitary Newtonian Gravity Makes Semiclassical Gravity Viable for All Practical Purposes},
  author = {Sergio De Filippo},
  journal= {arXiv preprint arXiv:1807.10469},
  year   = {2018}
}