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On quantum gravity tests with composite particles.

Shreya P Kumar1, Martin B Plenio2

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Quantum gravity may alter fundamental physics, but tests are challenging. This study bounds quantum gravity effects in macroscopic systems, improving experimental precision for tests of quantum gravity.

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Area of Science:

  • Theoretical Physics
  • Quantum Gravity
  • Experimental Physics

Background:

  • Quantum gravity theories suggest modifications to canonical commutation relations, impacting position and momentum descriptions.
  • Experimental verification of these quantum gravity effects is a significant challenge.
  • Corrections are expected to scale with particle mass, motivating macroscopic particle experiments.

Purpose of the Study:

  • To address the challenge of suppressed quantum gravity corrections in composite particles.
  • To experimentally bound the scaling of these suppression effects.
  • To integrate these bounds into rigorous quantum gravity test analyses.

Main Methods:

  • Analysis of data from past macroscopic pendulum experiments.
  • Derivation of bounds on the scaling of quantum gravity corrections with particle composition.
  • Comparison of derived bounds with existing experimental results from quantum mechanical oscillators.

Main Results:

  • Tight experimental bounds were established for the scaling of quantum gravity corrections.
  • These bounds surpass the precision of current experiments using quantum mechanical oscillators.
  • The findings provide crucial parameters for future quantum gravity tests.

Conclusions:

  • Macroscopic pendulum experiments offer a viable platform for constraining quantum gravity effects.
  • Experimental bounds on suppression scaling are essential for robust quantum gravity tests.
  • Future experiments can yield even stronger constraints, advancing the search for quantum gravity.