Information paradox and island of covariant black holes in LQG

Abstract

We study information paradox of four dimensional covariant black holes inspired by loop quantum gravity (LQG) with two well motivated solutions. We first prepare the spacetime in the Hartle-Hawking state, compute the radiation entropy and recover a linear growth at late time. When considering the mass loss and incorporating greybody factors, we show that for Solution~1 the LQG parameter $\zeta$ leaves temperature and Planckian factor of the spectrum unchanged but enhances the near-horizon barrier, leading to a faster evaporation rate as $M$ decreases. This behavior contrasts sharply with Solution~2, which has slow evaporation rate at small $M$ and admits a non-singular continuation suggestive of a remnant or a black-to-white-hole transition. We then apply the island prescription on the eternal background and find that quantum extremal surfaces exist in solution 1 geometries; $\zeta$ primarily shifts the island boundary and suppresses the late time entropy growth, preserving unitarity. Our results highlight that covariance-respecting LQG black hole do not exhibit a universal late time behavior.

arXiv comment9 pages and 4 figure; V2, 11 pages, 6 figures. Match the published version

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