Bi-metric theory of gravity from the non-chiral Plebanski action

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Bi-metric theory of gravity from the non-chiral Plebanski action

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arxiv 1003.4701 v2 pith:5DEWUUWR submitted 2010-03-24 hep-th gr-qc

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We study a modification of the Plebanski action for general relativity, which leads to a modified theory of gravity with eight degrees of freedom. We show how the action can be recasted as a bi-metric theory of gravity, and expanding around a bi-flat background we identify the six extra degrees of freedom with a second, massive graviton and a scalar mode.

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Renormalization group flows in area-metric gravity
gr-qc 2025-07 conditional novelty 7.0 of 10

The first renormalization group analysis of area-metric gravity shows shape-mismatching masses grow toward the infrared, parity is not emergent, and the Immirzi parameter flow has fixed points at γ=0 and γ=∞.

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