Lifshitz Scaling, Microstate Counting from Number Theory and Black Hole Entropy

Abstract

Non-relativistic field theories with anisotropic scale invariance in (1+1)-d are typically characterized by a dispersion relation $E\sim k^z$ and dynamical exponent $z>1$. The asymptotic growth of the number of states of these theories can be described by an extension of Cardy formula that depends on $z$. We show that this result can be recovered by counting the partitions of an integer into $z$-th powers, as proposed by Hardy and Ramanujan a century ago. This gives a novel relationship between the characteristic energy of the dispersion relation with the cylinder radius and the ground state energy. For free bosons with Lifshitz scaling, this relationship is shown to be identically fulfilled by virtue of the reflection property of the Riemann $\zeta$-function. The quantum Benjamin-Ono${}_2$ (BO${}_2$) integrable system, relevant in the AGT correspondence, is also analyzed. As a holographic realization, we provide a special set of boundary conditions for which the reduced phase space of Einstein gravity with a couple of $U(1)$ fields on AdS${}_3$ is described by the BO${}_2$ equations. This suggests that the phase space can be quantized in terms of quantum BO${}_2$ states. Indeed, in the semiclassical limit, the ground state energy of BO${}_2$ coincides with the energy of global AdS${}_3$, and the Bekenstein-Hawking entropy for BTZ black holes is recovered from the anisotropic extension of Cardy formula.

21 pages. v2: minor corrections + extended discussion on the generalized modular invariance in the intro; matches published version

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Cited by in corpus (15)

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