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If gravity is classical, it must have irreducible fluctuations that mediate classical correlations, not quantum entanglement. Experiments measuring the cross-correlation of coherent masses can test this quantum-classical gravity hypothesis.

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Area of Science:

  • Quantum physics
  • Classical mechanics
  • Gravitational theory

Background:

  • The unification of quantum mechanics and general relativity remains a major challenge in theoretical physics.
  • Investigating the quantum nature of gravity is crucial for a complete understanding of the universe.

Purpose of the Study:

  • To explore the implications of a classical theory of gravity coexisting with quantum matter.
  • To propose experimental tests distinguishing classical gravity from quantum gravity.

Main Methods:

  • Utilizing a consistent theory of quantum-classical dynamics in the Newtonian limit.
  • Analyzing irreducible fluctuations in classical gravity.
  • Proposing experiments with coherent source masses and cross-correlation measurements.

Main Results:

  • Classical gravity, if true, necessitates irreducible fluctuations that mediate classical correlations, not quantum entanglement.
  • Characteristic phase responses can distinguish classical gravity from quantum gravity and decoherence.

Conclusions:

  • Experimental verification of classical gravity is achievable through precise measurements of gravitational interactions between coherent masses.
  • The proposed experiments offer a viable pathway to test fundamental hypotheses about the nature of gravity.