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arXiv · 2610.38704

Gravitational anomaly spectroscopy of a Kitaev spin liquid

Kumar Ghosh
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Abstract

The chiral central charge $c$ measures the gravitational anomaly of a two-dimensional topological phase. It fixes the heat current carried along the edge. So far, it has been accessed through thermal transport, where phonons complicate the signal, or through wave-function probes that need a pure ground state. Here we show that $c$ is a spectroscopic quantity of the edge. A weak modulation of the edge couplings that travel along the edge is absorbed according to the Virasoro algebra. Normalized by the response to a static change of the same couplings, the absorbed weights obey $D_n=2n\langle L_0\rangle+\frac{c}{12}(n^3-n)$, so that $\mathcal{C}\equiv2D_2-4D_1=c$ in any state of the ideal edge theory, thermal or not. The central charge thus appears in transition weights, although it cancels from excitation gaps. The ratio of line weights with and without a vison in the bulk, $Λ=4h_σ/c$, needs no calibration and fixes the conformal spin $h_σ$ of the non-Abelian Ising anyon. For the Kitaev honeycomb spin liquid we find $\mathcal{C}=0.49999$ and $h_σ=0.06250$ on 7168 spins. Calibrating with the shift of the measured line itself gives $c$ within about $1\%$ on 96 spins and within $1\%$ under $20\%$ random coupling errors. Interacting edge Majoranas in a fixed flux sector, treated with DMRG, keep $\mathcal{C}$ within $1.5\%$ while the edge velocity changes by $\pm13\%$. An exact simulation of a quantum-processor protocol, including the native Floquet circuit, returns $c$ within $3.5\%$ on 96 to 600 spins.

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Kumar Ghosh. 2026-10-28. Gravitational anomaly spectroscopy of a Kitaev spin liquid. https://arxiv.org/abs/2610.38704

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