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Dilaton-axion inflation with PBHs and GWs

2022; Institute of Physics; Volume: 2022; Issue: 08 Linguagem: Inglês

10.1088/1475-7516/2022/08/037

1475-7516

Рената Каллош, Andrei Linde,

Galaxies: Formation, Evolution, Phenomena

Abstract We discuss two-stage dilaton-axion inflation models [1] and describe α -attractor models with either exponential or polynomial approach to the plateau. We implement one of the models of primordial black hole production proposed in [2] in the α -attractor context, and develop its supergravity version. The predictions of this model following from its polynomial attractor properties are: n s and r are α -independent, r depends on the mass parameter μ defining the approach to the plateau. The tachyonic instability at the transition point between the two stages of inflation is proportional to the negative curvature of the hyperbolic space ℛ K = -2/3 α . Therefore the masses of primordial black holes (PBHs) and the frequencies of small-scale gravitational waves (GWs) in this model show significant dependence on α .