Hybrid α -attractors, primordial black holes and gravitational wave backgrounds

Hybrid α -attractors, primordial black holes and gravitational wave backgrounds by Matteo Braglia et al. on Monday 28 November We investigate the two-stage inflation regime in the theory of hybrid cosmological $\alpha$-attractors. The spectrum of inflationary perturbations is compatible with the latest Planck/BICEP/Keck results, thanks to the attractor properties of the model. However, at smaller scales, it may have a very high peak of controllable width and position, leading to a copious production of primordial black holes (PBH) and generation of a stochastic background of gravitational waves (SGWB). arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14262v1