J1342+0928 Confirms the Cosmological Timeline in R_h=ct

Abstract

The discovery of quasar J1342+0928 (z=7.54) reinforces the time compression problem associated with the premature formation of structure in LCDM. 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_sol seed, created by a Pop II/III supernova, should have taken at least 820 Myr to grow via Eddington-limited accretion. This failure by LCDM constitutes one of its most serious challenges, requiring exotic `fixes', such as anomalously high accretion rates, or the creation of enormously massive (~10^5 M_sol) seeds, neither of which is ever seen in the local Universe, or anywhere else for that matter. Indeed, to emphasize this point, J1342+0928 is seen to be accreting at about the Eddington rate, negating any attempt at explaining its unusually high mass due to such exotic means. In this Letter, we demonstrate that the discovery of this quasar instead strongly confirms the cosmological timeline predicted by the R_h=ct universe. In this model, a 10 M_sol seed at z ~ 15 (the start of the Epoch of Reionization at t ~ 878 Myr) would have easily grown into an 8 x 10^8 M_sol black hole at z=7.54 (t ~ 1.65 Gyr) via conventional Eddington-limited accretion.