On quantum gravity tests with composite particles.

Abstract:

:Models of quantum gravity imply a fundamental revision of our description of position and momentum that manifests in modifications of the canonical commutation relations. Experimental tests of such modifications remain an outstanding challenge. These corrections scale with the mass of test particles, which motivates experiments using macroscopic composite particles. Here we consider a challenge to such tests, namely that quantum gravity corrections of canonical commutation relations are expected to be suppressed with increasing number of constituent particles. Since the precise scaling of this suppression is unknown, it needs to be bounded experimentally and explicitly incorporated into rigorous analyses of quantum gravity tests. We analyse this scaling based on data from past experiments involving macroscopic pendula, and provide tight bounds that exceed those of current experiments based on quantum mechanical oscillators. Furthermore, we discuss possible experiments that promise even stronger bounds thus bringing rigorous and well-controlled tests of quantum gravity closer to reality.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kumar SP,Plenio MB

doi

10.1038/s41467-020-17518-5

subject

Has Abstract

pub_date

2020-08-06 00:00:00

pages

3900

issue

1

issn

2041-1723

pii

10.1038/s41467-020-17518-5

journal_volume

11

pub_type

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