Search for Quantum Gravity

Details Search for Quantum Gravity Search for Quantum Gravity

1999-05-14

arxiv.org/abs/gr-qc/9905048v1

Gen.Rel.Grav.31:1257-1262,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages LATEX, no figures, Awarded First Prize in the Gravity Research Foundation Essay Competition for 1999

Scientific paper

10.1023/A:1026720723556

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 in sensitivity are feasible.

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