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arXiv · 2407.05702

Modified hybrid inflation in no-scale SUGRA with suppressed $R$-symmetry breaking

Qian Wan·Da-Xin Zhang
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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 $S^n$ with $n\geq 4$ 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 $r\sim 10^{-2}$ and a spectral index $n_s\approx 0.965$ are obtained, which are approximately independent of $n$.

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Qian Wan, Da-Xin Zhang. 2024-07-08. Modified hybrid inflation in no-scale SUGRA with suppressed $R$-symmetry breaking. https://doi.org/10.1140/epjc%2Fs10052-025-13911-w

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