Anatoly Klypin
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View article: Evolution of clustering in cosmological models with time-varying dark energy
Evolution of clustering in cosmological models with time-varying dark energy Open
Observations favor cosmological models with a time-varying dark energy component. But how does dynamical dark energy (DDE) influence the growth of structure in an expanding Universe? We investigate this question using high-resolution $N$-b…
View article: Constraining cosmological parameters using void statistics from the SDSS survey
Constraining cosmological parameters using void statistics from the SDSS survey Open
Aims. We aim to constrain the amplitude of the linear spectrum of density fluctuations ( σ 8 ), the matter density parameter (Ω m ), the Hubble constant (H 0 ), Γ = Ω c h , and S 8 from Sloan Digital Sky Survey Data Release 7 (SDSS DR7) by…
View article: The <scp>Uchuu</scp>-<scp>glam</scp> BOSS and eBOSS LRG lightcones: exploring clustering and covariance errors
The <span>Uchuu</span>-<span>glam</span> BOSS and eBOSS LRG lightcones: exploring clustering and covariance errors Open
This study investigates the clustering and bias of Luminous Red Galaxies (LRG) in the BOSS-LOWZ, -CMASS, -COMB, and eBOSS samples, using two types of simulated lightcones: (i) high-fidelity lightcones from UchuuN-body simulation, employing…
View article: Constraining cosmological parameters using void statistics from the SDSS survey
Constraining cosmological parameters using void statistics from the SDSS survey Open
We identify voids as maximal non-overlapping spheres within the haloes of the Uchuu simulation and three smaller halo simulation boxes with smaller volume and different $σ_{8}$ values, and galaxies with redshift in the range $0.02
View article: The Uchuu–SDSS galaxy light-cones: a clustering, redshift space distortion and baryonic acoustic oscillation study
The Uchuu–SDSS galaxy light-cones: a clustering, redshift space distortion and baryonic acoustic oscillation study Open
We present the data release of the Uchuu–SDSS galaxies: a set of 32 high-fidelity galaxy light-cones constructed from the large Uchuu 2.1 trillion particles N-body simulation using Planck cosmology. We adopt subhalo abundance matching to p…
View article: The Relation between Galaxy ISM and Circumgalactic O vi Gas Kinematics Derived from Observations and ΛcDM Simulations
The Relation between Galaxy ISM and Circumgalactic O vi Gas Kinematics Derived from Observations and ΛcDM Simulations Open
We present the first galaxy-O vi absorption kinematic study for 20 absorption systems (EW > 0.1 å) associated with isolated galaxies (0.15 ≤ z ≤ 0.55) that have accurate redshifts and rotation curves obtained using Keck/ESI. Our sample is …
View article: The correlation function and detection of baryon acoustic oscillation peak from the spectroscopic <tt>SDSS-GalWCat</tt> galaxy cluster catalogue
The correlation function and detection of baryon acoustic oscillation peak from the spectroscopic SDSS-GalWCat galaxy cluster catalogue Open
We measure the two-point correlation function (CF) of 1357 galaxy clusters with a mass of log10M200 ≥ 13.6 h−1 M⊙ and at a redshift of z ≤ 0.125. This work differs from previous analyses in that it utilizes a spectroscopic cluster catalogu…
View article: The Uchuu-GLAM BOSS and eBOSS LRG lightcones: Exploring clustering and covariance errors
The Uchuu-GLAM BOSS and eBOSS LRG lightcones: Exploring clustering and covariance errors Open
This study investigates the clustering and bias of Luminous Red Galaxies (LRG) in the BOSS-LOWZ, -CMASS, -COMB, and eBOSS samples, using two types of simulated lightcones: (i) high-fidelity lightcones from Uchuu $N$-body simulation, employ…
View article: Constraining Cosmological Parameters Using the Cluster Mass–Richness Relation
Constraining Cosmological Parameters Using the Cluster Mass–Richness Relation Open
The cluster mass–richness relation (MRR) is an observationally efficient and potentially powerful cosmological tool for constraining the matter density Ω m and the amplitude of fluctuations σ 8 using the cluster abundance technique. We der…
View article: Uchuu–ν2GC galaxies and AGN: cosmic variance forecasts of high-redshift AGN for JWST, <i>Euclid</i>, and LSST
Uchuu–ν2GC galaxies and AGN: cosmic variance forecasts of high-redshift AGN for JWST, <i>Euclid</i>, and LSST Open
Measurements of the luminosity function of active galactic nuclei (AGN) at high redshift (z ≳ 6) are expected to suffer from field-to-field variance, including cosmic and Poisson variances. Future surveys, such as those from the Euclid tel…
View article: Confirmation of the standard cosmological model from red massive galaxies $\sim600$ Myr after the Big Bang
Confirmation of the standard cosmological model from red massive galaxies $\sim600$ Myr after the Big Bang Open
In their recent study, Labbé et al. used multi-band infrared images captured by the James Webb Space Telescope (JWST) to discover a population of red massive galaxies that formed approximately 600 million years after the Big Bang. The auth…
View article: The Uchuu-universe machine data set: galaxies in and around clusters
The Uchuu-universe machine data set: galaxies in and around clusters Open
We present the public data release of the Uchuu-UM galaxy catalogues by applying the UniverseMachine algorithm to assign galaxies to the dark matter haloes in the Uchuu N-body cosmological simulation. It includes a variety of baryonic prop…
View article: Constraining Cosmological Parameters using the Cluster Mass-Richness Relation
Constraining Cosmological Parameters using the Cluster Mass-Richness Relation Open
The cluster mass-richness relation (MRR) is an observationally efficient and potentially powerful cosmological tool for constraining the mean matter density of the universe and the amplitude of fluctuations using the cluster abundance tech…
View article: The Uchuu-UniverseMachine dataset: Galaxies in and around Clusters
The Uchuu-UniverseMachine dataset: Galaxies in and around Clusters Open
We present the public data release of the Uchuu-UM galaxy catalogues by applying the UniverseMachine algorithm to assign galaxies to the dark matter halos in the Uchuu $N$-body cosmological simulation. It includes a variety of baryonic pro…
View article: Uchuu-$ν^2$GC galaxies and AGN: Cosmic variance forecasts of high-redshift AGN for JWST, Euclid, and LSST
Uchuu-$ν^2$GC galaxies and AGN: Cosmic variance forecasts of high-redshift AGN for JWST, Euclid, and LSST Open
Measurements of the luminosity function of active galactic nuclei (AGN) at high redshift ($z\gtrsim 6$) are expected to suffer from field-to-field variance, including cosmic and Poisson variances. Future surveys, such as those from the Euc…
View article: Fast full N-body simulations of generic modified gravity: conformal coupling models
Fast full N-body simulations of generic modified gravity: conformal coupling models Open
We present mg-glam , a code developed for the very fast production of full N-body cosmological simulations in modified gravity (MG) models. We describe the implementation, numerical tests and first results of a large suite of cosmological …
View article: Fast full N-body simulations of generic modified gravity: derivative coupling models
Fast full N-body simulations of generic modified gravity: derivative coupling models Open
We present mg-glam , a code developed for the very fast production of full N -body cosmological simulations in modified gravity (MG) models. We describe the implementation, numerical tests and first results of a large suite of cosmological…
View article: The Uchuu simulations: Data Release 1 and dark matter halo concentrations
The Uchuu simulations: Data Release 1 and dark matter halo concentrations Open
We introduce the Uchuu suite of large high-resolution cosmological N-body simulations. The largest simulation, named Uchuu, consists of 2.1 trillion (12 8003) dark matter particles in a box of side-length 2.0 $\, h^{-1} \, \rm Gpc$, with p…
View article: Clustering and halo abundances in early dark energy cosmological models
Clustering and halo abundances in early dark energy cosmological models Open
Cold Dark Matter with cosmological constant (ΛCDM) cosmological models with early dark energy (EDE) have been proposed to resolve tensions between the Hubble constant $H_0=100\, h$ km ṡ−1Ṁpc−1 measured locally, giving h ≈ 0.73, and H0 dedu…
View article: Building a digital twin of a luminous red galaxy spectroscopic survey: galaxy properties and clustering covariance
Building a digital twin of a luminous red galaxy spectroscopic survey: galaxy properties and clustering covariance Open
Upcoming surveys will use a variety of galaxy selections to map the large-scale structure of the Universe. It is important to make accurate predictions for the properties and clustering of such galaxies, including the errors on these stati…
View article: Full-sky photon simulation of clusters and active galactic nuclei in the soft X-rays for eROSITA
Full-sky photon simulation of clusters and active galactic nuclei in the soft X-rays for eROSITA Open
International audience
View article: Cosmological Constraints on Ω<sub>m</sub> and σ<sub>8</sub> from Cluster Abundances Using the GalWCat19 Optical-spectroscopic SDSS Catalog
Cosmological Constraints on Ω<sub>m</sub> and σ<sub>8</sub> from Cluster Abundances Using the GalWCat19 Optical-spectroscopic SDSS Catalog Open
We derive cosmological constraints on the matter density, , and the amplitude of fluctuations, , using , a catalog of 1800 galaxy clusters we identified in the Sloan Digital Sky Survey-DR13 spectroscopic data set using our GalWeight techni…
View article: The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: GLAM-QPM mock galaxy catalogues for the emission line galaxy sample
The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: GLAM-QPM mock galaxy catalogues for the emission line galaxy sample Open
We present 2000 mock galaxy catalogues for the analysis of baryon acoustic oscillations (BAOs) in the Emission Line Galaxy (ELG) sample of the extended Baryon Oscillation Spectroscopic Survey Data Release 16 (eBOSS DR16). Each mock catalog…
View article: The mass function dependence on dark matter haloes dynamical state
The mass function dependence on dark matter haloes dynamical state Open
Galaxy clusters are luminous tracers of the most massive dark matter haloes in the universe. To use them as a cosmological probe, a detailed description of the relation between observable properties and host dark matter halo characteristic…
View article: Suppressing cosmic variance with paired-and-fixed cosmological simulations: average properties and covariances of dark matter clustering statistics
Suppressing cosmic variance with paired-and-fixed cosmological simulations: average properties and covariances of dark matter clustering statistics Open
Making cosmological inferences from the observed galaxy clustering requires accurate predictions for the mean clustering statistics and their covariances. Those are affected by cosmic variance – the statistical noise due to the finite numb…
View article: Effects of long-wavelength fluctuations in large galaxy surveys
Effects of long-wavelength fluctuations in large galaxy surveys Open
In order to capture as much information as possible large galaxies surveys have been increasing their volume and redshift depth. To face this challenge theory has responded by making cosmological simulations of huge computational volumes w…
View article: GalWeight Application: A publicly-available catalog of dynamical parameters of 1,800 galaxy clusters from SDSS-DR13, ($\mathtt{GalWCat19}$)
GalWeight Application: A publicly-available catalog of dynamical parameters of 1,800 galaxy clusters from SDSS-DR13, ($\mathtt{GalWCat19}$) Open
Utilizing the SDSS-DR13 spectroscopic dataset, we create a new publicly-available catalog of 1,800 galaxy clusters (GalWeight cluster catalog, $\mathtt{GalWCat19}$) and a corresponding catalog of 34,471 identified member galaxies. The clus…
View article: The dependence of halo bias on age, concentration, and spin
The dependence of halo bias on age, concentration, and spin Open
Halo bias is the main link between the matter distribution and dark matter\nhalos. In its simplest form, halo bias is determined by halo mass, but there\nare known additional dependencies on other halo properties which are of\nconsequence …
View article: A semi-analytical perspective on massive galaxies at z ∼ 0.55
A semi-analytical perspective on massive galaxies at z ∼ 0.55 Open
The most massive and luminous galaxies in the Universe serve as powerful probes to study the formation of structure, the assembly of mass, and cosmology. However, their detailed formation and evolution is still barely understood. Here we e…
View article: Erratum: Accurate mass and velocity functions of dark matter halos
Erratum: Accurate mass and velocity functions of dark matter halos Open