# J1342+0928 supports the timeline in the Rh = ct cosmology

@article{Melia2017J13420928ST,
title={J1342+0928 supports the timeline in the Rh = ct cosmology},
author={Fulvio Melia},
journal={Astronomy \& Astrophysics},
year={2017}
}
• F. Melia
• Published 8 December 2017
• Physics
• Astronomy & Astrophysics
Aims. The discovery of quasar J1342+0928 (z = 7.54) reinforces the time compression problem associated with the premature formation of structure in Λ cold dark matter (ΛCDM). Adopting the Planck parameters, we see this quasar barely 690 Myr after the big bang, no more than several hundred Myr after the transition from Pop III to Pop II star formation. Yet conventional astrophysics would tell us that a 10 M⊙ seed, created by a Pop II/III supernova, should have taken at least 820 Myr to grow via…

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## References

SHOWING 1-10 OF 71 REFERENCES

One cannot understand the early appearance of 109 M☉ supermassive black holes without invoking anomalously high accretion rates or the creation of exotically massive seeds, neither of which is seen
• Physics
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
• 2015
The recent discovery of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.3 has exacerbated the time compression problem implied by the appearance of supermassive black holes only
• Physics
• 2007
We perform three-dimensional smoothed particle hydrodynamics simulations in a realistic cosmological setting to investigate the expansion, feedback, and chemical enrichment properties of a 200 M☉
• Physics
• 2009
The supermassive black holes (SMBHs) massive enough (≳ few ×109 M☉) to power the bright redshift z ≈ 6 quasars observed in the Sloan Digital Sky Survey (SDSS) are thought to have assembled by mergers
• Physics
• 1997
The minimum mass that a virialized gas cloud must have in order to be able to cool in a Hubble time is computed, using a detailed treatment of the chemistry of molecular hydrogen. With a simple model
• Physics
• 2015
The observational evidence that Super-Massive Black Holes (M 10 9 10 M ) are already in place less than 1Gyr after the Big Bang poses stringent time constraints on the growth efficiency of their
The horizon problem in the standard model of cosmology (LDCM) arises from the observed uniformity of the cosmic microwave background radiation, which has the same temperature everywhere (except for
• Physics
• 2005
We discuss a model for the early assembly of supermassive black holes (SMBHs) at the center of galaxies that trace their hierarchical buildup far up into the dark halo "merger tree." Motivated by the
• Physics
Nature
• 2011
Observations of a quasar at a redshift of 7.3 are reported, suggesting that the neutral fraction of the intergalactic medium in front of ULAS J1120+0641 exceeded 0.1.
Many cosmological measurements today suggest that the Universe is expanding at a constant rate. This is inferred from the observed age versus redshift relationship and various distance indicators,