The Cosmological Constant from a Quantum Gravitational $θ$-Vacua and the Gravitational Hall Effect

• URL: http://arxiv.org/abs/2506.14886v1
• Date: Tue, 17 Jun 2025 18:00:14 GMT
• Title: The Cosmological Constant from a Quantum Gravitational $θ$-Vacua and the Gravitational Hall Effect
• Authors: Stephon Alexander, Heliudson Bernardo, Aaron Hui,
• Abstract summary: Chern-Simons-Kodama state of quantum gravity has a striking structural similarity to the topological field theory of the quantum Hall effect.<n>We find that the cosmological constant $Lambda$ is intimately linked to the $theta$- parameter by $theta=12pi2/(Lambda ell2_rm Pl) mod 2pi$ due to the fact that Chern-Simons-Kodama state must live in a particular $theta$-sector.
• Score: 0.4499833362998489
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We provide a new perspective on the cosmological constant by exploring the background-independent Wheeler-DeWitt quantization of general relativity. The Chern-Simons-Kodama state of quantum gravity, a generalization of the Hartle-Hawking and Vilenkin states, has a striking structural similarity to the topological field theory of the quantum Hall effect. As a result, we study the gravitational topological $\theta$-sectors in analogy to Yang-Mills theory. We find that the cosmological constant $\Lambda$ is intimately linked to the $\theta$-parameter by $\theta=12\pi^2/(\Lambda \ell^2_{\rm Pl}) \mod 2\pi$ due to the fact that Chern-Simons-Kodama state must live in a particular $\theta$-sector. This result is shown in the canonical, non-perturbative formalism. Furthermore, we explain how the physics of the Hamiltonian constraint is analogous to the quantum Hall effect, with the cosmological constant playing the role of a quantum gravitational Hall resistivity. These relations suggest that $\Lambda$ is topologically protected against perturbative graviton loop corrections, analogous to the robustness of quantized Hall conductance against disorder in a metal.

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