A simple supergravity model of inflation constrained with Planck 2018 data. (arXiv:1909.02019v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+German_G/0/1/0/all/0/1">Gabriel Germán</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hidalgo_J/0/1/0/all/0/1">Juan Carlos Hidalgo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cedeno_F/0/1/0/all/0/1">Francisco X. Linares Cedeño</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Montiel_A/0/1/0/all/0/1">Ariadna Montiel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vazquez_J/0/1/0/all/0/1">J. Alberto Vázquez</a>
We study a model of inflation based on $mathcal{N}=1$ supergravity
essentially depending on one effective parameter. Under a field transformation
we show that this model turns out to be equivalent to a previously studied
supergravity model known to be ruled out with the original choice of the
parameter. Such parameter measures the slope of the potential at observable
scales. Through a Bayesian parameter estimation, it is shown how this model is
compatible with recent CMB temperature measurements by {it Planck 2018} giving
rise to a simple, viable, single field model of inflation. The tensor to scalar
ratio constraint is found to be $r_{0.002}<0.065$ with negative running. We
discuss how observables are invariant under the field transformation which
leaves unaltered the slow-roll parameters. As a consequence the use of one
presentation of the model or its field-transformed version is purely a matter
of convenience.
We study a model of inflation based on $mathcal{N}=1$ supergravity
essentially depending on one effective parameter. Under a field transformation
we show that this model turns out to be equivalent to a previously studied
supergravity model known to be ruled out with the original choice of the
parameter. Such parameter measures the slope of the potential at observable
scales. Through a Bayesian parameter estimation, it is shown how this model is
compatible with recent CMB temperature measurements by {it Planck 2018} giving
rise to a simple, viable, single field model of inflation. The tensor to scalar
ratio constraint is found to be $r_{0.002}<0.065$ with negative running. We
discuss how observables are invariant under the field transformation which
leaves unaltered the slow-roll parameters. As a consequence the use of one
presentation of the model or its field-transformed version is purely a matter
of convenience.
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