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Islands and Icebergs may contribute nothing to the Page curve
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We study the entanglement entropy of a subsystem in contact with symmetrical bath where the complete system lives on the boundary of AdS3 spacetime. The system-A is taken to be in the middle of the bath system-B and the full system is taken to be some fixed localized region of the boundary 2-dimensional CFT. We generally assume that the d.o.f.s in the total system remain fixed when we vary the size of the bath which is to be guided by the conservation laws. It is found that the island and the subleading (icebergs) contributions are inseparable, and in totality they contribute nothing to the Page-curve of the radiation. As such they contribute only to the unphysical branch of the entropy. The entropy formula of the radiation may simply be written as minimum of {S[A],S[B]} including for the black holes.
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Exact islands scenario for CFT systems and critical ratios in higher geometry
For strip-shaped CFT_d systems, bath-pair entropy peaks at a generalized golden-ratio critical size, then falls through an exactly resummed island entropy term, with far-separated mutual information decaying as 1 over...
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