Primordial black holes in the curvaton model: possible connections to pulsar timing arrays and dark matter

• DOI: 10.48550/arxiv.2305.13382
• Publication Date: 2023-01-01
• Authors: Giacomo Ferrante; Gabriele Franciolini; Antonio Iovino; Alfredo Urbano
• Keywords: Primordial black hole; Gravitational wave background

We revise primordial black holes (PBHs) production in the axion-curvaton model, light of recent developments computation their abundance accounting for non-gaussianities (NGs) curvature perturbation up to all orders. find that NGs intrinsically generated such scenarios have a relevant impact on phenomenology associated PBHs and, particular, relation between and signal second-order gravitational waves. show this model could explain both totality dark matter asteroid mass range tentative reported by NANOGrav IPTA collaborations nano-Hz frequency range. En route, we provide new, explicit power spectrum perturbations going beyond sudden-decay approximation.