Gravitational Waves From No-Scale Supergravity. (arXiv:2205.05595v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Spanos_V/0/1/0/all/0/1">Vassilis C. Spanos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stamou_I/0/1/0/all/0/1">Ioanna D. Stamou</a>

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.

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.

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