325 citations
- The University of TokyoJP18 papers
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17 papers · 1 filter
Revisiting chameleon gravity - thin-shells and no-shells with appropriate boundary conditions
Takashi Tamaki, Shinji Tsujikawa
We derive analytic solutions of a chameleon scalar field that couples to a non-relativistic matter in the weak gravitational background of a spherically symmetric body, paying…
Hidden symmetries, null geodesics, and photon capture in the Sen black hole
Kenta Hioki, Umpei Miyamoto
Important classes of null geodesics and hidden symmetries in the Sen black hole are investigated. First, we obtain the principal null geodesics and circular photon orbits. Then, an…
Accelerating universe, WEP violation and antihydrogen atoms
Yasunori Fujii
Apart from the suspected violation of the CPT invariance, we might expect if the measurements of antihydrogen atoms provide testing Weak Equivalence Principle (WEP) in the gravitat…
Post-Newtonian parameters in the tensor-vector-scalar theory
Takashi Tamaki
We investigate post-Newtonian parameters in the tensor-vector-scalar (TeVeS) theory in a general setting while previous researches have been restricted to spherically symmetric cas…
Static and symmetric wormholes respecting energy conditions in Einstein-Gauss-Bonnet gravity
Hideki Maeda, Masato Nozawa
Properties of -dimensional static wormhole solutions are investigated in Einstein-Gauss-Bonnet gravity with or without a cosmological constant . We assume that the spa…
Conformal transformation in the scalar-tensor theory applied to the accelerating universe
Yasunori Fujii
The scalar-tensor theory is plagued by nagging questions if different conformal frames, in particular the Jordan and Einstein conformal frames, are equivalent to each other. As a c…