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arXiv · 2603.19763

Microstate Counting for rotating (type~II) isolated horizons

Pritam Nanda
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Abstract

We present a proposal for black hole microstate counting in Loop Quantum Gravity (LQG) for rotating (type~II) isolated horizons. The key obstacle in extending the standard nonrotating entropy derivation arises from the $θ$-dependent rotation 1-form, which breaks the global Chern--Simons (CS) structure on the horizon. We propose a local decomposition of the horizon $S^2$ into narrow concentric rings, each approximated as a locally nonrotating patch with a constant effective CS level. Each ring is quantized independently using standard LQG techniques, and the total entropy is obtained by integrating over the entire horizon. This method restores a local CS description, includes the contribution of angular momentum, and is consistent with the first law of black hole mechanics.

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Pritam Nanda. 2026-03-20. Microstate Counting for rotating (type~II) isolated horizons. https://arxiv.org/abs/2603.19763

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