Speaker
Description
We investigate the formation of dark matter primordial black holes (PBHs) from two types of axion-like fields. In the first scenario, an axion-like field plays the role of the inflaton. We study PBH formation in axion inflation with a bumpy potential using lattice simulations. In particular, we compute the power spectrum of curvature perturbations in the strong backreaction regime and show that the resulting spectrum can lead to the formation of PBHs that account for all of the dark matter in the Universe. In the second scenario, we consider an axion-like curvaton model, in which a sharp peak in the curvature perturbation power spectrum is generated by the dynamics of a scalar field whose phase direction corresponds to an axion-like field. This model can also produce PBHs with various masses, including PBHs that can account for all of the dark matter.
| Primary Abstract Topic | Theory: Other Dark Matter |
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