I will present two topics that suggest an accelerated growth of structures in high-density regions of the early universe. First is the birth of supermassive black hole (SMBH), and second is the formation of massive disk galaxies, both at redshifts z>6. Recent discoveries of billion solar mass SMBH at z=6-7 suggests that the gas accretion was quite rapid in the early universe with a super-Eddington rate. I will discuss a scenario called the 'Direct Collapse' of BH seed at high redshift, which has been attracting significant attention lately. I will also present our cosmological SPH simulation results of high-redshift galaxies at z=6-12, and discuss their observability with ALMA.
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