Phys. Rev. Lett. 50, 705–708 (1983)Causality Versus Gauge Invariance in Quantum Gravity and SupergravityReceived 6 December 1982; published in the issue dated 7 March 1983 It is proposed that one should admit in the path integral for the quantized gravitational field only those space-times for which the final three-geometry is located in the future of the initial one. As a consequence, and unlike the situation for the Yang-Mills field, the resulting causal amplitude is not annihilated by all the gauge (surface deformation) generators. In supergravity the causal amplitude turns out not to be annihilated by the local supersymmetry generators either. © 1983 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.50.705
DOI:
10.1103/PhysRevLett.50.705
PACS:
04.60.+n, 11.15.+q, 11.30.Pb
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