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82 papers
Note on the Time Dilation of Charged Quantum Clocks
Takeshi Chiba, Shunichiro Kinoshita
We derive the time dilation formula for charged quantum clocks in electromagnetic fields. As a concrete example of non-inertial motion, we consider a cyclotron motion in a uniform…
Quantum Clocks, Gravitational Time Dilation, and Quantum Interference
Takeshi Chiba, Shunichiro Kinoshita
A proper time observable for a quantum clock is introduced and it is found that the proper time read by one clock conditioned on another clock reading a different proper time obeys…
Spontaneous Scalarization in Scalar-Tensor Theories with Conformal Symmetry as an Attractor
Takeshi Chiba
Motivated by constant-G theory, we introduce a one-parameter family of scalar-tensor theories as an extension of constant-G theory in which the conformal symmetry is a cosmological…
Disformal invariance of cosmological observables
Takeshi Chiba, Fabio Chibana, Masahide Yamaguchi
We study the frame dependence/independence of cosmological observables under disformal transformations, extending the previous results regarding conformal transformations, and prov…
The effect of our local motion on the Sandage-Loeb test of the cosmic expansion
Takuya Inoue, Eiichiro Komatsu, Wako Aoki +3
Redshifts of an astronomical body measured at multiple epochs (e.g., separated by 10 years) are different due to the cosmic expansion. This so-called Sandage-Loeb test offers a dir…
Probing the Universe through the Stochastic Gravitational Wave Background
Sachiko Kuroyanagi, Takeshi Chiba, Tomo Takahashi
Stochastic gravitational wave backgrounds, predicted in many models of the early universe and also generated by various astrophysical processes, are a powerful probe of the Univers…