The search for a physically viable theory of quantized gravitation is ongoing; in part because the physics it
ought to describe is unknown, and in part because different approaches may not ‘approach’ the same
physics. The most prominent contenders are string theory and loop quantum gravity, with ample literature
available on either sides. For book-sized expositions see for example [97, 177
, 112
, 199
]. The present
report and [157
] describe a circle of ideas which differ in several important ways from these
approaches.
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