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Quantizing gravity and spacetime: Where do we stand ?
Author(s) -
Ne'eman Yuval
Publication year - 1999
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/(sici)1521-3889(199901)8:1<3::aid-andp3>3.0.co;2-c
Subject(s) - minkowski space , physics , spacetime , observable , quantum gravity , theoretical physics , causal sets , mathematical physics , quantum field theory in curved spacetime , loop quantum gravity , quantum , space (punctuation) , classical mechanics , quantum mechanics , computer science , operating system
We review five possible solutions to the riddle posed by Quantum Gravity: (1) Gravity should stay as a classical theory (L. Rosenfeld); (2) Quantum Gravity requires a formalism which will take the human mind (or the intelligent observer) into account, resolving at the same time the riddle of the collapse of the wave function/state vector in Quantum Mechanics in general (Penrose); (3) Perturbative Quantization; (4) Hamiltonian Quantization (Dirac, Ashtekar); (5) String Theory. We also discuss the quantization of spacetime.