309 citations · 1.9k across the 61 of their papers we have counts for
43 papers · 1 filter
Analytic and numerical study of dark matter halos in the Horndeski theory
Kohei Onoda, Shun Arai, Daisuke Yamauchi +3
The models of modified gravity that can explain the late-time accelerated expansion of the Universe must pass the local tests of gravity, introducing a screening mechanism so that…
First test of the consistency relation for the large-scale structure using the anisotropic three-point correlation function of BOSS DR12 galaxies (An explanatory video is available at https://youtu.be/Zi36ooLPhss.)
Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi +6
We present, for the first time, an observational test of the consistency relation for the large-scale structure (LSS) of the Universe through a joint analysis of the anisotropic tw…
Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
Teppei Minoda, Shohei Saga, Tomo Takahashi +4
In the most distant reaches of the Universe, the 21-cm hyperfine transition in neutral hydrogen provides one of the only available tracers of large-scale structure. A number of ins…
New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies
Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi +6
We report a new test of modified gravity theories using the large-scale structure of the Universe. This paper is the first attempt to (1) apply a joint analysis of the anisotropic…
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…
Skewness consistency relation in large-scale structure and test of gravity theory
Daisuke Yamauchi, Shoya Ishimaru, Takahiko Matsubara +1
We investigate the skewness of galaxy number density fluctuations as a possible probe to test gravity theories. We find that the specific linear combination of the skewness paramet…
Signature of primordial non-Gaussianity on 21-cm power spectrum from dark ages
Daisuke Yamauchi
We study the signature of primordial non-Gaussianity imprinted on the power spectrum of the 21-cm line differential brightness temperature during dark ages. Employing the perturbat…
Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
Daisuke Yamauchi, Shuichiro Yokoyama, Tomo Takahashi
We revisit a possible scale-dependence of local-type primordial non-Gaussianities induced by super-horizon evolution of scalar field perturbations. We develop the formulation based…
Second-order peculiar velocity field as a novel probe of scalar-tensor theories
Daisuke Yamauchi, Naonori S. Sugiyama
We investigate the galaxy bispectrum induced by the nonlinear gravitational evolution as a possible probe to constrain degenerate higher-order scalar tensor (DHOST) theories. We fi…
Unified approach to secondary effects on the CMB B-mode polarization
Toshiya Namikawa, Atsushi Naruko, Ryo Saito +2
We develop a systematic and unified approach to estimate all possible secondary (i.e. non-primordial) nonlinear effects to the cosmic microwave background (CMB) polarization, named…
Testing gravity theories with cosmic microwave background in the degenerate higher-order scalar-tensor theory
Takashi Hiramatsu, Daisuke Yamauchi
We study the cosmic microwave background (CMB) in the framework of the degenerate higher-order scalar-tensor (DHOST) theory to test gravity theories. This theoretical framework inc…
CMB Constraints on the Stochastic Gravitational-Wave Background at Mpc scales
Toshiya Namikawa, Shohei Saga, Daisuke Yamauchi +1
We present robust constraints on the stochastic gravitational waves (GWs) at Mpc scales from the cosmic microwave background (CMB) data. CMB constraints on GWs are usually characte…
Constraining DHOST theories with linear growth of matter density fluctuations
Shin'ichi Hirano, Tsutomu Kobayashi, Daisuke Yamauchi +1
We investigate the potential of cosmological observations, such as galaxy surveys, for constraining degenerate higher-order scalar-tensor (DHOST) theories, focusing in particular o…
Large-scale inhomogeneity of dark energy produced in the ancestor vacuum
Yue Nan, Kazuhiro Yamamoto, Hajime Aoki +2
We investigate large-scale inhomogeneity of dark energy in the bubble nucleation scenario of the universe. In this scenario, the present universe was created by a bubble nucleation…
Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
Square Kilometre Array Cosmology Science Working Group, David J. Bacon, Richard A. Battye +44
We present a detailed overview of the cosmological surveys that will be carried out with Phase 1 of the Square Kilometre Array (SKA1), and the science that they will enable. We hig…
Observational signatures of dark energy produced in an ancestor vacuum: Forecast for galaxy surveys
Daisuke Yamauchi, Hajime Aoki, Satoshi Iso +3
We study observational consequences of the model for dark energy proposed in [1] (Aoki et al., Phys.Rev. D97 (2018) no.4, 043517). We assume our universe has been created by bubble…
Y-junction intercommutations of current carrying strings
D. A. Steer, Marc Lilley, Daisuke Yamauchi +1
Under certain conditions the collision and intercommutation of two cosmic strings can result in the formation of a third string, with the three strings then remaining connected at…
Are redshift-space distortions actually a probe of growth of structure?
Rampei Kimura, Teruaki Suyama, Masahide Yamaguchi +2
We present an impact of coupling between dark matter and a scalar field, which might be responsible for dark energy, on measurements of redshift-space distortions. We point out tha…
Constraining modified theory of gravity with galaxy bispectrum
Daisuke Yamauchi, Shuichiro Yokoyama, Hiroyuki Tashiro
We explore the use of galaxy bispectrum induced by the nonlinear gravitational evolution as a possible probe to test general scalar-tensor theories with second-order equations of m…
Multitracer technique for galaxy bispectrum - An application to constraints on non-local primordial non-Gaussianities -
Daisuke Yamauchi, Shuichiro Yokoyama, Keitaro Takahashi
We explore the use of galaxy bispectra with multitracer technique as a possible probe of primordial non-Gaussianities. We forecast future constraints on non-linearity parameters, $…
Cosmology with the Square Kilometre Array by SKA-Japan
Daisuke Yamauchi, Kiyotomo Ichiki, Kazunori Kohri +8
In the past several decades, the standard cosmological model has been established and its parameters have been measured to a high precision, while there are still many of the funda…
Delensing Cosmic Microwave Background B-modes with the Square Kilometre Array Radio Continuum Survey
Toshiya Namikawa, Daisuke Yamauchi, Blake Sherwin +1
We explore the potential use of the Radio Continuum (RC) survey conducted by the Square Kilometre Array (SKA) to remove (delens) the lensing-induced B-mode polarization and thus en…
Large scale CMB anomalies from thawing cosmic strings
Christophe Ringeval, Daisuke Yamauchi, Jun'ichi Yokoyama +1
Cosmic strings formed during inflation are expected to be either diluted over super-Hubble distances, i.e., invisible today, or to have crossed our past light cone very recently. W…
Probing higher-order primordial non-Gaussianity with galaxy surveys
Daisuke Yamauchi, Keitaro Takahashi
With a radio continuum galaxy survey by the Square Kilometre Array (SKA), a photometric galaxy survey by Euclid and their combination, we forecast future constraints on primordial…