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Finite-time future singularities in modified Gauss-Bonnet and gravity and singularity avoidance
Kazuharu Bamba, Sergei D. Odintsov, Lorenzo Sebastiani +1
We study all four types of finite-time future singularities emerging in late-time accelerating (effective quintessence/phantom) era from -gravity, where and $…
Behavior of gravity around a crossing of the phantom divide
Kazuharu Bamba
We study a model of gravity in which a crossing of the phantom divide can be realized. In particular, we demonstrate the behavior of gravity around a crossing of the…
Oscillating phantom in gravity
Kazuharu Bamba, Chao-Qiang Geng
We investigate the oscillating effective equation of state (EoS) of the universe around the phantom divide in the framework of gravity. We illustrate the behavior of …
Equivalence of modified gravity equation to the Clausius relation
Kazuharu Bamba, Chao-Qiang Geng, Shin'ichi Nojiri +1
We explicitly show that the equations of motion for modified gravity theories of -gravity, the scalar-Gauss-Bonnet gravity, -gravity and the non-local gravity…
Equilibrium thermodynamics in modified gravitational theories
Kazuharu Bamba, Chao-Qiang Geng, Shinji Tsujikawa
We show that it is possible to obtain a picture of equilibrium thermodynamics on the apparent horizon in the expanding cosmological background for a wide class of modified gravity…
Finite-time future singularities in modified gravity
Kazuharu Bamba
We review finite-time future singularities in modified gravity. We reconstruct an explicit model of modified gravity realizing a crossing of the phantom divide and show that the Bi…
Thermodynamics in gravity with phantom crossing
Kazuharu Bamba, Chao-Qiang Geng
We study thermodynamics of the apparent horizon in gravity. In particular, we demonstrate that a gravity model with realizing a crossing of the phantom divide can sat…