Search for Quantum Gravity
John.Ellis, N.E. Mavromatos, D.V. Nanopoulos

TL;DR
This paper reviews theoretical approaches to quantum gravity and discusses potential experimental tests, suggesting that current and near-future observations could detect quantum space-time structures at the Planck scale.
Contribution
It provides an overview of quantum gravity theories and highlights feasible experimental tests using astrophysical and laboratory data to detect quantum space-time effects.
Findings
Current experiments are nearing sensitivity to Planck-scale effects.
Observations of distant astrophysical sources can test quantum gravity.
Laboratory experiments like kaon decays can probe quantum space-time.
Abstract
A satisfactory theory of quantum gravity may necessitate a drastic modification of our perception of space-time, by giving it a foamy structure at distances comparable to the Planck length. It is argued in this essay that the experimental detection of such structures may be a realistic possibility in the foreseeable future. After a brief review of different theoretical approaches to quantum gravity and the relationships between them, we discuss various possible experimental tests of the quantum nature of space-time. Observations of photons from distant astrophysical sources such as Gamma-Ray Bursters and laboratory experiments on neutral kaon decays may be sensitive to quantum-gravitational effects if they are only minimally suppressed. Experimental limits from the Whipple Observatory and the CPLEAR Collaboration are already probing close to the Planck scale, and significant increases…
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