Year: 2025
Type: article
Abstract: A well-motivated cosmological hybrid inflation scenario based on no-scale SUGRA is considered. It is demonstrated that an extra suppressed R -symmetry breaking term $$S^n$$ S n with $$n\ge 4$$ n ≥ 4 needs to be included in order to realize successful inflation. The resulting potential is found to be similar (but not identical) to the one in the Starobinsky inflation model. A relatively larger tensor-to-scalar ratio $$r\sim 10^{-2}$$ r ∼ 10 - 2 and a spectral index $$n_s\approx 0.965$$ n s ≈ 0.965 are obtained, which are approximately independent of n .
Source: The European Physical Journal C
Authors: Qian Wan, Da-Xin Zhang
Institution: Peking University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4407719067