305 citations · 2.9k across the 49 of their papers we have counts for
49 papers
Cosmological gravity probes: connecting recent theoretical developments to forthcoming observations
Shun Arai, Katsuki Aoki, Yuji Chinone +20
Since the discovery of the accelerated expansion of the present Universe, significant theoretical developments have been made in the area of modified gravity. In the meantime, cosm…
CMB constraints on DHOST theories
Takashi Hiramatsu
We put constraints on the degenerate higher-order scalar-tensor (DHOST) theories using the Planck 2018 likelihoods. In our previous paper, we developed a Boltzmann solver incorpora…
Testing gravity with the cosmic microwave background: constraints on modified gravity with two tensorial degrees of freedom
Takashi Hiramatsu, Tsutomu Kobayashi
We provide a cosmological test of modified gravity with two tensorial degrees of freedom and no extra propagating scalar mode. The theory of gravity we consider admits a cosmologic…
Gauge Kinetic Mixing and Dark Topological Defects
Takashi Hiramatsu, Masahiro Ibe, Motoo Suzuki +1
We discuss how the topological defects in the dark sector affect the Standard Model sector when the dark photon has a kinetic mixing with the QED photon. In particular, we consider…
Gravitational wave spectra from oscillon formation after inflation
Takashi Hiramatsu, Evangelos I. Sfakianakis, Masahide Yamaguchi
We systematically investigate the preheating behavior of single field inflation with an oscillon-supporting potential. We compute the properties of the emitted gravitational waves…
Statistically-Anisotropic Tensor Bispectrum from Inflation
Takashi Hiramatsu, Kai Murai, Ippei Obata +1
We develop a possibility of generating tensor non-Gaussianity in a kind of anisotropic inflation, where a gauge field is kinetically coupled to a spectator scalar field. Owi…