Did JWST observe imprints of axion miniclusters or primordial black holes?
Gert Hütsi, Martti Raidal, Juan Urrutia, Ville Vaskonen, Hardi Veermäe
Submitted on 4 November 2022, last revised on 14 November 2022
The James Webb Space Telescope has detected surprisingly luminous early galaxies that indicate a tension with the
CDM. Motivated by scenarios
including axion miniclusters or primordial black holes, we consider power-law
modifications of the matter power spectrum. We show that the tension could be
resolved if dark matter consists of axions or if a
fraction of dark matter is composed of compact heavy
structures such as primordial
black hole clusters. However, in both cases, the star formation efficiency
needs to be significantly enhanced.
Comment: 6 pages, 4 figures; references added, discussion extended
Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics; High Energy Physics - Phenomenology