14 citations · 15 across the 5 of their papers we have counts for
5 papers
Casimir-Induced Quintessence in Dark Dimension
Tomoki Katayama, Hiroki Matsui, Yuri Michinobu +3
We investigate a concrete realization of the Dark Dimension scenario, where a single large extra dimension is set at sub-millimeter scales. In this framework, the Casimir energy of…
Detectability and Template Distinguishability of the Dark Ages 21 cm Global Signal with Wide and Sparse Frequency Coverage
Shintaro Yoshiura, Fumiya Okamatsu, Tomo Takahashi
The Dark Ages 21cm signal, observed at frequencies below 50 MHz, can serve as a powerful probe of cosmology, as the standard cosmological model predicts a well-defined 21cm spectra…
EFT of Dark Energy with Cosmic Chronometers: Reconstructing Background EFT Functions
Fumiya Okamatsu, Kazufumi Takahashi
The effective field theory (EFT) of dark energy provides a model-independent framework for studying cosmology within scalar-tensor theories. In this work, we explore how the time e…
Dark age consistency in the 21cm global signal
Fumiya Okamatsu, Teppie Minoda, Tomo Takahashi +2
We propose a new observable for the 21cm global signal during the dark ages, the dark-age consistency ratio, which is motivated from the fact that the shape of the functional form…
tension without CMB data: beyond the CDM
Fumiya Okamatsu, Toyokazu Sekiguchi, Tomo Takahashi
We investigate the tension in a range of extended model frameworks beyond the standard CDM without the data from cosmic microwave background (CMB). Specifically, we adopt…