82 citations · 447 across the 29 of their papers we have counts for
30 papers
Fast and accurate differentiable code of the galaxy power spectrum based on Eulerian and Lagrangian one-loop perturbation theories
Yosuke Kobayashi, Kazuyuki Akitsu
This paper presents a JAX-Python implementation of the galaxy power spectrum up to one-loop order in the effective field theory of large-scale structure, based on both the Eulerian…
Intrinsic Alignments in Redshift Space I: Symmetries
Kazuyuki Akitsu, Shi-Fan Chen, Zvonimir Vlah
Galaxy shapes are unique tensor tracers of large-scale structure, providing a promising avenue to both enhance current cosmological programs and detect new physics beyond the scala…
Lyman-Alpha Forest and its Cross-Correlation with High-Redshift Galaxies in Effective Field Theory at the Field Level
Roger de Belsunce, Mikhail M. Ivanov, James M. Sullivan +2
We present a field-level perturbative forward model for the Lyman-alpha (Lya) forest flux decrement. We validate it on two simulation suites: large-volume AbacusSummit N-body simul…
Blue-tilted spectral running and the JWST early galaxy tension
Mikage U. Kobayashi, Gen Chiaki, Kazutaka Kimura +4
Recently, the James Webb Space Telescope (JWST) collaboration has found the unexpectedly large abundance of massive galaxies with stellar masses of at high…
Galaxy sizes as complementary (zero-)bias tracers of local primordial non-Gaussianity
Nhat-Minh Nguyen, Kazuyuki Akitsu, Atsushi Taruya
The scale-dependent bias in halo and galaxy power spectra is a key signature of local primordial non-Gaussianity (local PNG), with PNG sensitivity scaling as -- the ratio…
Equilateral non-Gaussian Bias at the Field Level
Divij Sharma, James M. Sullivan, Kazuyuki Akitsu +1
Primordial non-Gaussianity (PNG) is a common prediction of a wide class of inflationary models. Equilateral-type PNG, generically predicted by single-field inflationary models with…
Cosmology inference with perturbative forward modeling at the field level: a comparison with joint power spectrum and bispectrum analyses
Kazuyuki Akitsu, Marko Simonović, Shi-Fan Chen +2
We extend field-level inference to jointly constrain the cosmological parameters , in both real and redshift space. Our analyses are based on mock data gener…
Modeling the Cosmological Lyman- Forest at the Field Level
Roger de Belsunce, Mikhail M. Ivanov, James M. Sullivan +2
The distribution of absorption lines in the spectra of distant quasars, called the Lyman- (Ly-) forest, is a unique probe of cosmology and the intergalactic medium at high re…
Mapping the galaxy-halo connection to the galaxy bias: implication to the HOD-informed prior
Kazuyuki Akitsu
The galaxy bias parameters are crucial for modeling the large-scale structure in cosmology, yet uncertainties in these parameters often degrade the precision of cosmological constr…
Constraining cosmology with N-body simulations for future spectroscopic galaxy surveys at
Sy-Yun Pu, Teppei Okumura, Chian-Chou Chen +2
Determining the spatial curvature () independent of cosmic microwave background observations plays a key role in revealing the physics of the early universe. The Hubble tensio…
A Parameter-Masked Mock Data Challenge for Beyond-Two-Point Galaxy Clustering Statistics
2pt Collaboration, Elisabeth Krause, Yosuke Kobayashi +23
The last few years have seen the emergence of a wide array of novel techniques for analyzing high-precision data from upcoming galaxy surveys, which aim to extend the statistical a…
BOSS Constraints on Massive Particles during Inflation: The Cosmological Collider in Action
Giovanni Cabass, Oliver H. E. Philcox, Mikhail M. Ivanov +4
Massive particles leave imprints on primordial non-Gaussianity via couplings to the inflaton, even despite their exponential dilution during inflation: practically, the Universe ac…
Imprints of primordial magnetic fields on intrinsic alignments of galaxies
Shohei Saga, Maresuke Shiraishi, Kazuyuki Akitsu +1
Primordial magnetic fields (PMFs) are one of the plausible candidates for the origin of the observed large-scale magnetic fields. While many proposals have been made for the genera…
Quadratic shape biases in three-dimensional halo intrinsic alignments
Kazuyuki Akitsu, Yin Li, Teppei Okumura
Understanding the nonlinear relation between the shapes of halos or galaxies and the surrounding matter distribution is essential in accurate modeling of their intrinsic alignments…
Statistical anisotropy in galaxy ellipticity correlations
Maresuke Shiraishi, Teppei Okumura, Kazuyuki Akitsu
As well as the galaxy number density and peculiar velocity, the galaxy intrinsic alignment can be used to test the cosmic isotropy. We study distinctive impacts of the isotropy bre…
Constraining cosmological vorticity modes with CMB secondary anisotropies
William R. Coulton, Kazuyuki Akitsu, Masahiro Takada
Observational searches for large-scale vorticity modes in the late time Universe are underexplored. Within the standard CDM model, this is well motivated given the observed prop…
Ultra-light axions and the tension: joint constraints from the cosmic microwave background and galaxy clustering
Keir K. Rogers, Renée Hložek, Alex Laguë +5
We search for ultra-light axions as dark matter (DM) and dark energy particle candidates, for axion masses , by…
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…
Gravitational wave fossils in nonlinear regime: halo tidal bias and intrinsic alignments from gravitational wave separate universe simulations
Kazuyuki Akitsu, Yin Li, Teppei Okumura
We investigate impacts of long-wavelength gravitational waves (GWs) on nonlinear structure formation by utilizing the tidal separate universe simulations. Based on the equivalence…
Lagrangian approach to super-sample effects on biased tracers at field level: galaxy density fields and intrinsic alignments
Atsushi Taruya, Kazuyuki Akitsu
It has been recognized that the observables of large-scale structure (LSS) is susceptible to long-wavelength density and tidal fluctuations whose wavelengths exceed the accessible…
Alcock-Paczynski effects on wide-angle galaxy statistics
Maresuke Shiraishi, Kazuyuki Akitsu, Teppei Okumura
The Alcock-Paczynski (AP) effect is a geometrical distortion in three-dimensional observed galaxy statistics. In anticipation of precision cosmology based on ongoing and upcoming a…
Wide-angle effects on galaxy ellipticity correlations
Maresuke Shiraishi, Atsushi Taruya, Teppei Okumura +1
We show an efficient way to compute wide-angle or all-sky statistics of galaxy intrinsic alignment in three-dimensional configuration space. For this purpose, we expand the two-poi…
Cosmological simulation in tides: power spectra and halo shape responses, and shape assembly bias
Kazuyuki Akitsu, Yin Li, Teppei Okumura
The well-developed separate universe technique enables accurate calibration of the response of any observable to an isotropic long-wavelength density fluctuation. The large-scale e…
Galaxy imaging surveys as spin-sensitive detector for cosmological colliders
Kazuhiro Kogai, Kazuyuki Akitsu, Fabian Schmidt +1
Galaxy imaging surveys provide us with information on both the galaxy distribution and their shapes. In this paper, we systematically investigate the sensitivity of galaxy shapes t…