7 papers
Reheating in No-Scale Models of Inflation
Ignatios Antoniadis, John Ellis, Dimitri V. Nanopoulos +2
Analogously to the suppression of inflaton decays into conformally-coupled scalar fields in the original Starobinsky model of inflation, inflaton decays to Standard Model…
Planck-Scale Effects on Nucleon Decay in Minimal Supersymmetric SU(5)
John Ellis, Jason L. Evans, Shihwen Hor +2
We examine the impact on the phenomenology of the minimal supersymmetric SU(5) Grand Unified Theory (GUT) of dimension-5 operators with coefficients suppressed by the Planck mass s…
Radiative Corrections in Supergravity Models of Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
Supergravity provides the natural supersymmetric framework for early universe cosmology. A broad class of inflationary models in no-scale supergravity yields tree-level predictions…
Constraints on Attractor Models of Inflation and Reheating from Planck, BICEP/Keck, ACT DR6, and SPT-3G Data
John Ellis, Marcos A. G. Garcia, Keith A. Olive +1
We analyze the latest cosmic microwave background (CMB) constraints on the scalar spectral index and tensor-to-scalar ratio from Planck 2018, BICEP/Keck 2018, the Atacama…
Effects of Radiative Corrections on Starobinsky Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
We analyze radiative corrections to the Starobinsky model of inflation arising from self-interactions of the inflaton, and from its Yukawa couplings, , to matter fermions, and d…
Deformations of Starobinsky Inflation in No-Scale SU(5) and SO(10) GUTs
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
The original Starobinsky model of inflation is consistent with Planck and other measurements of the CMB, but recent results from the ACT and SPT Collaborations hint that…