78 citations · 452 across the 23 of their papers we have counts for
24 papers
Model-independent parameters from DESI DR1 LRG2 with an explicitly varying power-spectrum shape
Yong-Seon Song, M. Icaza-Lizaola, Minji Oh +1
Distinguishing between dark energy and modified gravity as the origin of the accelerated expansion requires the cosmic distances and the growth of structure to be measured in a mod…
Breaking the degeneracy of the kinetic Sunyaev Zel'dovich cosmology in redshift space
Liang Xiao, Yi Zheng
The 'optical depth-linear growth rate' () degeneracy is a long-standing problem in the kinetic Sunyaev Zel'dovich (kSZ) cosmology. It can be spontaneously broken in re…
Tomographic Alcock-Paczynski Method with Redshift Errors
Liang Xiao, Zhiqi Huang, Yi Zheng +2
The tomographic Alcock-Paczynski (AP) method is a promising method that uses the redshift evolution of the anisotropic clustering in redshift space to calibrate cosmology. It exten…
Measuring cosmic filament spin with the kinetic Sunyaev-Zel'dovich effect
Yi Zheng, Yan-Chuan Cai, Weishan Zhu +3
The spin of intergalactic filaments has been predicted from simulations, and supported by tentative evidence from redshift-space filament shapes in a galaxy redshift survey: genera…
Cosmological constraints from the density gradient weighted correlation function
Xiaoyuan Xiao, Yizhao Yang, Xiaolin Luo +8
The mark weighted correlation function (MCF) is a computationally efficient statistical measure which can probe clustering information beyond that of the conventional 2-po…
Detection of pairwise kSZ effect with DESI galaxy clusters and Planck
Ziyang Chen, Pengjie Zhang, Xiaohu Yang +1
We report a detection of the pairwise kinematic Sunyaev-Zel'dovich (kSZ) effect, combining galaxy clusters in DESI imaging surveys and the Planck temperature maps. The detecti…
Sensitivity tests of cosmic velocity fields to massive neutrinos
Shuren Zhou, Zhenjie Liu, Qinglin Ma +8
We investigate impacts of massive neutrinos on the cosmic velocity fields, employing high-resolution cosmological -body simulations provided by the information-optimized CUBE co…
Expansion series of the pairwise velocity generating function and its implications on redshift space distortion modeling
Junde Chen, Pengjie Zhang, Yi Zheng
The pairwise velocity generating function has deep connection with both the pairwise velocity probability distribution function and modeling of redshift space distortion (RSD).…
Toward a more stringent test of gravity with redshift space power spectrum: simultaneous probe of growth and amplitude of large-scale structure
Yong-Seon Song, Yi Zheng, Atsushi Taruya
Redshift-space distortions (RSD) offers an exciting opportunity to test the gravity on cosmological scales. In the presence of galaxy bias, however, the RSD measurement at large sc…
Testing the theory of gravity with DESI: estimators, predictions and simulation requirements
Shadab Alam, Christian Arnold, Alejandro Aviles +33
Shortly after its discovery, General Relativity (GR) was applied to predict the behavior of our Universe on the largest scales, and later became the foundation of modern cosmology.…
Using the Mark Weighted Correlation Functions to Improve the Constraints on Cosmological Parameters
Yizhao Yang, Haitao Miao, Qinglin Ma +8
We used the mark weighted correlation functions (MCFs), , to study the large scale structure of the Universe. We studied five types of MCFs with the weighting scheme , w…
Cosmological Information from the Small-scale Redshift Space Distortions
Motonari Tonegawa, Changbom Park, Yi Zheng +4
The redshift-space distortion (RSD) in the observed distribution of galaxies is known as a powerful probe of cosmology. Observations of large-scale RSD have given tight constraints…
Robustness of the pairwise kinematic Sunyaev-Zeldovich power spectrum shape as a cosmological gravity probe
Yi Zheng
We prove from the modified gravity (MG) galaxy/halo mock catalogs that the shape of the pairwise kinematic Sunyaev-Zeldovich (kSZ) power spectrum has constraining pow…
Alcock-Paczynski Test with the Evolution of Redshift-Space Galaxy Clustering Anisotropy
Hyunbae Park, Changbom Park, Cristiano G. Sabiu +5
We develop an improved Alcock-Paczynski (AP) test method that uses the redshift-space two-point correlation function (2pCF) of galaxies. Cosmological constraints can be obtained by…
Study on the mapping of halo clustering from real space to redshift space
Yi Zheng, Yong-Seon Song, Minji Oh
The mapping of galaxy clustering from real space to redshift space introduces the anisotropic property to the measured galaxy density power spectrum in redshift space, known as the…
Accurate determination of halo velocity bias in simulations and its cosmological implications
Junde Chen, Pengjie Zhang, Yi Zheng +2
A long-standing issue in peculiar velocity cosmology is whether the halo/galaxy velocity bias at large scale. The resolution of this important issue must resort to high pre…
Hybrid modeling of redshift space distortions
Yong-Seon Song, Yi Zheng, Atsushi Taruya +1
The observed power spectrum in redshift space appears distorted due to the peculiar motion of galaxies, known as redshift-space distortions (RSD). While all the effects in RSD are…
Quantification of the multi-streaming effect in Redshift Space Distortion
Yi Zheng, Pengjie Zhang, Minji Oh
Both multi-streaming (random motion) and bulk motion cause the Finger-of-God (FoG) effect in redshift space distortion (RSD). We apply a direct measurement of the multi-streaming e…
Study on the mapping of dark matter clustering from real space to redshift space
Yi Zheng, Yong-Seon Song
The mapping of dark matter clustering from real space to redshift space introduces the anisotropic property to the measured density power spectrum in redshift space, known as the r…
Determination of the large scale volume weighted halo velocity bias in simulations
Yi Zheng, Pengjie Zhang, Yipeng Jing
A profound assumption in peculiar velocity cosmology is at sufficiently large scales, where is the volume weighted halo(galaxy) velocity bias with respect to the matt…
Sampling Artifact in Volume Weighted Velocity Measurement.--- II. Detection in simulations and comparison with theoretical modelling
Yi Zheng, Pengjie Zhang, Yipeng Jing
Measuring the volume weighted velocity power spectrum suffers from a severe systematic error, due to imperfect sampling of the velocity field from inhomogeneous distribution of dar…
Sampling Artifact in Volume Weighted Velocity Measurement.--- I. Theoretical Modelling
Pengjie Zhang, Yi Zheng, Yipeng Jing
Cosmology based on large scale peculiar velocity preferes volume weighted velocity statistics. However, measuring the volume weighted velocity statistics from inhomogeneously distr…
Peculiar Velocity Decomposition, Redshift Space Distortion and Velocity Reconstruction in Redshift Surveys. II. Dark Matter Velocity Statistics
Yi Zheng, Pengjie Zhang, Yipeng Jing +2
Massive spectroscopic redshift surveys open a promising window to accurately measure peculiar velocity at cosmological distances through redshift space distortion (RSD). In paper I…
Peculiar Velocity Decomposition, Redshift Space Distortion and Velocity Reconstruction in Redshift Surveys - I. The Methodology
Pengjie Zhang, Jun Pan, Yi Zheng
Massive spectroscopic surveys will measure the redshift space distortion (RSD) induced by galaxy peculiar velocity to unprecedented accuracy. We develop a new method to improve the…