https://doi.org/10.1140/epjc/s10052-022-10381-2
Regular Article - Theoretical Physics
An alternative framework for E-model inflation in supergravity
Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki, 541 24, Thessaloniki, Greece
Received:
6
April
2022
Accepted:
30
April
2022
Published online:
14
May
2022
We present novel realizations of E-model inflation within Supergravity which are largely associated with the existence of a pole of order one in the kinetic term of the (gauge-singlet) inflaton superfield. This pole arises due to the selected logarithmic Kähler potentials 
and 
, which parameterize the same hyperbolic manifold with scalar curvature 
, where 
is the coefficient of a logarithmic term. The associated superpotential W exhibits the same R charge with the inflaton-accompanying superfield and includes all the allowed renormalizable terms. For 
, inflation can be attained for 
at the cost of some tuning regarding the coefficients of the W terms and predicts a tensor-to-scalar ratio r at the level of 0.001. The tuning can be totally eluded for 
, which allows for quadratic- and quartic-like models with N values increasing with r and spectral index 
close or even equal to its present central observational value.
© The Author(s) 2022
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