In-out semi-classical gravity and quantum gravity |
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Authors: | Bernard S. Kay |
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Affiliation: | 1. Institute for Advanced Study, Princeton, NJ 08540, USA;2. Blackett Laboratory, Imperial College, London SW7 2BZ, England |
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Abstract: | Classical gravity with higher derivatives, when coupled to the in-out matrix element of Tμν: (a) appears to be free from instabilities of the in-in theory; (b) may be considered as the “underlying classical theory” to Tomboulis' quantum gravity. I explain how these two facts may be adduced as evidence for the viability both of the former semi-classical approximation and of the latter approach to full quantum gravity. |
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