No-scale supergravity realization of the Starobinsky model of inflation.
We present a model for cosmological inflation based on a no-scale supergravity sector with an SU(2,1)/SU(2)×U(1) Kähler potential, a single modulus T, and an inflaton superfield Φ described by a Wess-Zumino model with superpotential parameters (μ, λ). When T is fixed, this model yields a scalar spectral index n(s) and a tensor-to-scalar ratio r that are compatible with the Planck measurements for values of λ≃μ/3M(P). For the specific choice λ=μ/3M(P), the model is a no-scale supergravity realization of the R+R2 Starobinsky model.
Department of Physics, Theoretical Particle Physics and Cosmology Group, King's College London, London WC2R 2LS, United Kingdom and Theory Division, CERN, CH-1211 Geneva 23, Switzerland.
John
J
Ellis
Dimitri V
DV
Nanopoulos
Keith A
KA
Olive