This leads to a scaling exponent
, with only a weak dependence on
a
. There are even points with
a
=0 that lie in the well-defined, smooth phase. Hamber also
investigated the curvature and volume susceptibilities
and
. At a continuous phase transition,
should diverge, reflecting long-range correlations of a massless
graviton excitation. The data obtained are not incompatible with
such a scenario, but the extrapolation to the transition point
seems somewhat ambiguous. On the other hand, one does not expect
to diverge at
, which is corroborated by the simulations.
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Discrete Approaches to Quantum Gravity in Four Dimensions
Renate Loll http://www.livingreviews.org/lrr-1998-13 © Max-Planck-Gesellschaft. ISSN 1433-8351 Problems/Comments to livrev@aei-potsdam.mpg.de |