Nagoya University · Physics and Astronomy
Professor Sergei D. Odintsov's research lab specializes in theoretical cosmology and quantum gravity, focusing on modified gravity theories, dark energy dynamics, and the cosmological implications of quantum field effects in curved spacetime. The lab investigates non-linear and higher-order gravity models—such as f(R,T,RμνTμν) theories and Hořava-like gravity—aiming to explain cosmic acceleration, singularity resolution, and the late-time evolution of the universe. A key focus is on understanding how quantum corrections can stabilize singularities and lead to de Sitter-like phases, offering a quantum resolution to future cosmological singularities. The lab also explores the reconstruction of viable cosmological models, including ΛCDM and phantom-like dark energy scenarios, within generalized gravitational frameworks.
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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