In the entropy-modified Friedmann framework, sustained growth of the entropy source (ḟ/f > 0) makes the universe converge to an effective de Sitter state with density (ḟ/f)²/K², and current data bound the required source strength.
Entanglement entropy of Primordial Black Holes after inflation
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In this paper we study the survival of entanglement of a scalar field state created during inflation. We find that there exist UV-finite subdominant contributions to the entanglement entropy per momentum mode that scale with the number of e-folds between horizon exit and the end of inflation, and depend on the logarithm of the radius of the entangling surface, which can be taken to be the horizon sphere. We argue that this entanglement entropy allows for the formation of entangled Primordial Black Holes (PBH). We find that the entropy arising from the entanglement between PBH is small compared with their Bekenstein entropy.
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Elementary considerations on possible entropy-driven cosmological evolutions
In the entropy-modified Friedmann framework, sustained growth of the entropy source (ḟ/f > 0) makes the universe converge to an effective de Sitter state with density (ḟ/f)²/K², and current data bound the required source strength.