2005/04/30 by Shin'ichi Nojiri, Shin’ichi Nojiri, Sergei D. Odintsov +1 · 13 citations
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Curvature #Dark energy #Galaxies: Formation, Evolution, Phenomena #Gauss–Bonnet theorem #Geometry #Imaging phantom #Mathematical physics #Mathematics #Physics #Quantum mechanics #Quintessence #Scalar (mathematics) #Scalar curvature #Scalar field #Scalar potential #Theoretical physics #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.71.123509
published as Phys.Rev.D71:123509,2005 · LaTeX file, 9 pages, some revision/errors corrected
arxiv created 2005/05/25 · openalex publication_date 2005/06/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We propose the Gauss-Bonnet dark energy model inspired by string/M-theory where standard gravity with scalar contains additional scalar-dependent coupling with a Gauss-Bonnet invariant. It is demonstrated that the effective phantom (or quintessence) phase of the late universe may occur in the presence of such a term when the scalar is phantom or for nonzero potential (for canonical scalar). However, with the increase of the curvature, the Gauss-Bonnet term may become dominant so that the phantom phase is transient and the w=\ensuremath-1 barrier may be passed. Hence, the current acceleration of the universe may be caused by a mixture of scalar phantom and/or potential or stringy effects. It is remarkable that scalar-Gauss-Bonnet coupling acts against the big rip occurrence also in phantom cosmology.