J. Iwasaki et C. Rovelli, GRAVITONS FROM LOOPS - NONPERTURBATIVE LOOP-SPACE QUANTUM-GRAVITY CONTAINS THE GRAVITON-PHYSICS APPROXIMATION, Classical and quantum gravity, 11(7), 1994, pp. 1653-1676
We investigate the physical interpretation of the loop states of non-p
erturbative quantum general relativity in the regime of graviton physi
cs, namely the regime of first order excitations around the Poincare-i
nvariant vacuum. We construct the general form of the loop state funct
ionals invariant under the linearized constraints. We present explicit
ly the loop state functionals that represent the Poincare-invariant va
cuum and the graviton states. We find that physical information emerge
s entirely from intersections of loops. We obtain these results by uti
lizing the recently introduced 'map M', which relates the loop-space s
tates of non-perturbative quantum general relativity to the state spac
e of the linearized theory. The general picture of the linearization o
f the loop-space quantum general relativity is discussed.