Revisiting Tilt and Tensor-to-Scalar Ratio in the Multi-Scalar Field Inflation

for a sub-class of the generalized multi-scalar field inflation, which includes a linear coupling term between the multi-scalar field potential and the canonical Lagrangian. This coupling influences the slow-roll parameters and also alters our predictions for

n_{s}

and

r

, which directly depend on those parameters. More precisely, compared to standard multi-field inflation, the values of

n_{s}

and

r

decrease to levels consistent with the recent Planck+BICEP/Keck constraint. Interestingly, this validates the chaotic-type potential

V=\sum_{i} \mu_{i} \phi_{i}^{p}

, which were previously ruled out in the light of the current observations.

Note:

7 pages, 2 figures, and 2 tables

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