TY - JOUR
T1 - Comments on the importance of being over-constrained
AU - Elitzur, S.
AU - Forge, A.
AU - Rabinovici, E.
PY - 1992/9/3
Y1 - 1992/9/3
N2 - We consider quantum-electrodynamics and gravity in one dimension as systems with perturbatively a negative number of degrees of freedom. We find that indeed these pure systems are over-constrained and exist only as topological theories. In the presence of matter a degree of freedom is removed from the system and only special momenta are allowed. In some cases the cosmological constant gets quantized. We consider also two-dimensional gravity with a cosmological constant and suggest that this system is over-constrained as well.
AB - We consider quantum-electrodynamics and gravity in one dimension as systems with perturbatively a negative number of degrees of freedom. We find that indeed these pure systems are over-constrained and exist only as topological theories. In the presence of matter a degree of freedom is removed from the system and only special momenta are allowed. In some cases the cosmological constant gets quantized. We consider also two-dimensional gravity with a cosmological constant and suggest that this system is over-constrained as well.
UR - http://www.scopus.com/inward/record.url?scp=13844308351&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(92)91359-H
DO - 10.1016/0370-2693(92)91359-H
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AN - SCOPUS:13844308351
SN - 0370-2693
VL - 289
SP - 45
EP - 50
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -