We discuss the canonical quantization of general relativity and Weyl-squared gravity. We present the classical and quantum constraints and discuss their similarities and differences. We perform a semiclassical expansion and discuss the emergence of time for the two theories. While in the first case semiclassical time has a scale and a shape part, in the second case it only has a shape part.
机构:
INAF, Osservatorio Astrofis Catania, via SSofia 78, I-95123 Catania, Italy
Sez Catania, INFN, via S Sofia 64, I-95123 Catania, ItalyINAF, Osservatorio Astrofis Catania, via SSofia 78, I-95123 Catania, Italy
Bonanno, Alfio
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机构:
Conti, Maria
Zappala, Dario
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机构:
Sez Catania, INFN, via S Sofia 64, I-95123 Catania, Italy
Ctr Siciliano Fis Nucl & Struttura Mat, Catania, ItalyINAF, Osservatorio Astrofis Catania, via SSofia 78, I-95123 Catania, Italy