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arxiv: 1401.0673 · v2 · pith:H3IRE3UInew · submitted 2013-12-31 · 🌀 gr-qc

Emergence of Riemannian geometry and the massive graviton

classification 🌀 gr-qc
keywords quantumclassicaldifferentialgeometrygravitonmechanismriemannianalgebra
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We overview a new mechanism whereby classical Riemannian geometry emerges out of the differential structure on quantum spacetime, as extension data for the classical algebra of differential forms. Outcomes for physics include a new formula for the standard Levi-Civita connection, a new point of view of the cosmological constant as a very small mass for the graviton of around $10^{-33}$ev, and a weakening of metric-compatibility in the presence of torsion. The same mechanism also provides a new construction for quantum bimodule connections on quantum spacetimes and a new approach to the quantum Ricci tensor.

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