The cosmological constant is related to the topological theta angle by theta = 12 pi^2 / (Lambda l_Pl^2), suggesting Lambda is topologically protected.
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The Cosmological Constant from a Quantum Gravitational $\theta$-Vacua and the Gravitational Hall Effect
The cosmological constant is related to the topological theta angle by theta = 12 pi^2 / (Lambda l_Pl^2), suggesting Lambda is topologically protected.