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arXiv · 2610.23628

Alleviating cosmological strong coupling with torsion in regularized 4D Einstein-Gauss-Bonnet gravity

Jianhui Qiu·Ling-Wei Luo·Chunhui Liu·Chao-Qiang Geng
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Abstract

The four-dimensional scalar-tensor theory obtained by conformally regularizing the Gauss-Bonnet term has a vanishing kinetic term for the scalar perturbation mode on its late-time de Sitter attractor, signaling strong coupling. We show that, when the regularization is carried out in Riemann-Cartan geometry, the resulting theory admits de Sitter attractors with trace torsion on which this kinetic term remains nonvanishing. On spatially flat FLRW backgrounds with trace torsion, the quadratic actions for perturbations describe one scalar mode and two tensor modes, while the vector perturbations are nondynamical. We identify a nonempty parameter region admitting de Sitter attractors whose scalar and tensor perturbations are free of ghost and gradient instabilities at all momenta.

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Jianhui Qiu, Ling-Wei Luo, Chunhui Liu, Chao-Qiang Geng. 2026-10-16. Alleviating cosmological strong coupling with torsion in regularized 4D Einstein-Gauss-Bonnet gravity. https://arxiv.org/abs/2610.23628

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