Late-time growth weakly affects the significance of high-redshift massive galaxies

Late-time growth weakly affects the significance of high-redshift massive galaxies

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Recent observations by the James Webb Space Telescope have revealed massive galaxies at very high redshift ($zsimeq 7-15$).The question of whether the existence of such galaxies is expected in the corresponding JWST surveys has received a lot of attention, though the answer straddles areas of cosmology and complex astrophysical details of high-redshift galaxy formation.The growth rate of density fluctuations determines the amplitude In-Line Blower of overdensities that collapse to form galaxies.Late-time modifications of growth, combined with measurements at both $zsim Dishwasher Basket Plate Rack 1$ from large-scale structure and $zsim 1000$ from the cosmic microwave background, affect the predictions for the abundance of first galaxies in the universe.

In this paper, we point out that the late-time growth rate of structure affects the statistical significance of high-redshift, high-mass objects very weakly.Consequently, if the existence and abundance of these objects are confirmed to be unexpected, the variations in the late-time growth history are unlikely to explain these anomalies.