http://arxiv.org/abs/2205.05595
In this paper we study four concrete models, based on no-scale supergravity with SU(2,1)/SU(2)-$ \times$ U(1) symmetry. We modify either the K\”ahler potential or the superpotential using extra terms. In this scenario, the induced Gravitational Waves, are calculated to be detectable by the future space-based observations such as LISA, BBO and DECIGO. The models under study are interrelated, as they all yield the Starobinsky effective-like scalar potential in the unmodified case. We evaluate numerically the scalar power spectrum and the stochastic background of the Gravitational Waves, satisfying the observational Planck cosmological constraints for inflation. We find that the fine-tuning of the additional parameters in these models, is smaller if we require exclusively the production of Gravitational Waves, than in the case where in addition we produce Primordial Black Holes enough to account for the Dark Matter of the Universe.
V. Spanos and I. Stamou
Thu, 12 May 22
30/63
Comments: 22 pages, 5 figures