Phantom crossing in viable $f(R)$ theories

Chao-Qiang Geng; Chung-Chi Lee; Kazuharu Bamba

Phantom crossing in viable $f(R)$ theories

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arxiv 1108.2557 v1 pith:BH4LRQWE submitted 2011-08-12 gr-qc

Kazuharu Bamba , Chao-Qiang Geng , Chung-Chi Lee This is my paper · ORCID

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keywords crossinggravityphantomtheoriesviabledarkdivideenergy

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abstract

We review the equation of state for dark energy in modified gravity theories. In particular, we summarize the generic feature of the phantom divide crossing in the past and future in viable $f(R)$ gravity models.

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Preventing Curvature Singularities in $f(R)$ Dark Energy Models
gr-qc 2025-08 reject novelty 4.0 of 10

Adding R² or related higher-curvature corrections can prevent singularities in toy f(R) dark-energy models only when the correction mass is tuned far below the Starobinsky inflation scale.

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