At redshifts 2 to 7, black holes in massive elliptical hosts show no sign of the cosmological growth needed to make black holes the dark energy, with k=0.13 +/- 0.27 instead of k=3.
Models of cosmological black holes
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We study various aspects of modeling astrophysical black holes using the recently introduced semiclassical formalism of physical black holes (PBHs). This approach is based on the minimal requirements of observability and regularity of the horizons. We demonstrate that PBHs do not directly couple to the cosmological background in the current epoch, and their equation of state renders them unsuitable for describing dark energy. Utilizing their properties for analysis of more exotic models, we present a consistent semiclassical scenario for a black-to-white hole bounce and identify obstacles to the transformation from a black hole horizon to a wormhole mouth.
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Black Holes in the Red-sequence Elliptical Galaxies at Redshifts $\sim 0.7-2.5$: Not Dark Energy Source but Remanants of Little Red Dots
At redshifts 2 to 7, black holes in massive elliptical hosts show no sign of the cosmological growth needed to make black holes the dark energy, with k=0.13 +/- 0.27 instead of k=3.