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Quantum Action Principle with GUT

November, 2013, Jie Gu suggests Scardigli 1999 virtual micro-black hole GUT (as an 'other approach') is promising candidate of quantum gravity, along side loop quantum gravity and string theories.

Jul 2000
https://ia601001.us.archive.org/33/items/arxiv-hep-th9907150/hep-th9907150.pdf

Virtual micro-black hole ( #VBMH )
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