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Dynamics of Binary System around Supermassive Black Hole
Kei-ichi Maeda, Priti Gupta, Hirotada Okawa
We discuss motion of a binary system around a supermassive black hole. Using Fermi-Walker transport, we construct a local inertial reference frame and set up a Newtonian binary sys…
A Possible Solution to the Helium Anomaly of EMPRESS VIII by Cuscuton Gravity Theory
Kazunori Kohri, Kei-ichi Maeda
We discuss cosmology based on the cuscuton gravity theory to resolve the anomaly of the observational He abundance reported by the EMPRESS collaboration. We find that the gravi…
Cuscuta-Galileon cosmology: Dynamics, gravitational "constant"s and the Hubble Constant
Kei-ichi Maeda, Sirachak Panpanich
We discuss cosmology based on a Cuscuta-Galileon gravity theory, which preserves just two degrees of freedom. Although there exists no additional degrees of freedom, introduction o…
ECO-spotting: looking for extremely compact objects with bosonic fields
Vitor Cardoso, Caio F. B. Macedo, Kei-ichi Maeda +1
Black holes are thought to describe the geometry of massive, dark compact objects in the universe. To further support and quantify this long-held belief requires knowledge of possi…
Cosmological Dynamics of Cuscuta-Galileon Gravity
Sirachak Panpanich, Kei-ichi Maeda
We study cosmological dynamics of the cuscuta-galileon gravity with a potential term by using the dynamical system approach. This model is galileon generalization of the cuscuton g…
Post-Newtonian Kozai-Lidov Mechanism and its Effect on Cumulative Shift of Periastron Time of Binary Pulsar
Haruka Suzuki, Priti Gupta, Hirotada Okawa +1
We study the Kozai-Lidov mechanism in a hierarchical triple system in detail by the direct integration of the first-order post Newtonian equations of motion. We analyse a variety o…