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A microscopic normal matrix model for (A)dS2
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DOI：10.1007/JHEP01(2026)008.png)
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Abstract
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We describe the duality between the gravitating c = 1 (compact) Sine-Gordon model and a normal matrix model. From a two-dimensional quantum gravity perspective and due to the periodic nature of the potential, this model admits both anti-de Sitter and de-Sitter saddles, similarly to simpler models of Sine-Dilaton gravity, as well as more complicated interpolating “wineglass wormhole” geometries. From a string theory perspective the Euclidean de-Sitter (genus zero) saddles are related to the presence of a classical entropic contribution associated to the target space geometry. The gravitating Sine-Gordon model corresponds to a well defined CFT by construction and the eigenvalues of the dual normal matrix model are supported in a compact region of the complex plane. The duality with the normal matrix model is operationally defined even for a finite, but sufficiently large matrix size N, depending on the precise observable to be determined. We define and study a “microscopic” version of the large-N limit that allows us to recover non-perturbative results for all physical observables.
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