名古屋大学 · 物理学・天文学
Sergei D. Odintsov教授の研究室では、一般相対性理論の拡張としての修正重力理論や非線形重力-物質系の研究が中心であり、特に宇宙の加速膨張を説明するための効果的なファントムエネルギーやクインテッセンスのモデルを提案しています。また、未来の特異的状態（例えばビッグリップや突然の特異性）における量子力学的効果の影響を解析し、特異性の緩和やデ de Sitter 段階への到達可能性を示唆しています。さらに、Lorentz対称性の破れを内蔵した一般化されたf(R,T,RμνTμν)理論の構築と、ΛCDM宇宙やデ de Sitter 解の再構成も行われており、物質不安定性の問題に対しても深い考察がなされています。
Figures are computed from collected data and may differ slightly.
It is proposed that dark energy may become dominant over standard matter due to universe expansion (curvature decrease). Two models: non-linear gravity–matter system and modified gravity may provide an effective phantom or effective quintessence dark energy which complies with the conjecture. The effective quintessence naturally describes current cosmic speed-up.
We consider finite-time, future (sudden or Big Rip type) singularities which may occur even when strong energy condition is not violated but equation of state parameter is time-dependent. Recently, example of such singularity has been presented by Barrow, we found another example of it. Taking into account back reaction of conformal quantum fields near singularity, it is shown explicitly that quantum effects may delay (or make milder) the singularity. It is argued that if the evolution to singul
We propose general f(R,T,RμνTμν) theory as generalization of covariant Hořava-like gravity with dynamical Lorentz symmetry breaking. FRLW cosmological dynamics for several versions of such theory is considered. The reconstruction of the above action is explicitly done, including the numerical reconstruction for the occurrence of ΛCDM universe. De Sitter universe solutions in the presence of non-constant fluid are also presented. The problem of matter instability in f(R,T,RμνTμν) gravity is discu
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