Abstract
Measurements of the cosmic microwave background (CMB) favour models of inflation with a small tensor-to-scalar ratio r, as predicted by the Starobinsky R + R2 model. It has been shown previously that various models based on no-scale supergravity with different forms of superpotential make predictions similar to those of the Starobinsky model. In this paper we present a unified and general treatment of Starobinsky avatars of no-scale supergravity, using the underlying non-compact SU(2,1)/SU(2)×U(1) symmetry to demonstrate equivalences between different models, exhibiting 6 specific equivalence classes.
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Ellis, J., Nanopoulos, D.V., Olive, K.A. et al. A general classification of Starobinsky-like inflationary avatars of SU(2,1)/SU(2)×U(1) no-scale supergravity. J. High Energ. Phys. 2019, 99 (2019). https://doi.org/10.1007/JHEP03(2019)099
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DOI: https://doi.org/10.1007/JHEP03(2019)099