153 citations · 796 across the 38 of their papers we have counts for
22 papers · 1 filter
Using angular two-point correlations to self-calibrate the photometric redshift distributions of DECaLS DR9
Haojie Xu, Pengjie Zhang, Hui Peng +7
Calibrating the redshift distributions of photometric galaxy samples is essential in weak lensing studies. The self-calibration method combines angular auto- and cross-correlations…
Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1
Shamik Ghosh, Yang Liu, Le Zhang +17
AliCPT is the first Chinese cosmic microwave background (CMB) experiment which will make the most precise measurements of the CMB polarization in the northern hemisphere. The key s…
Forecasts on CMB lensing observations with AliCPT-1
Jinyi Liu, Zeyang Sun, Jiakang Han +18
AliCPT-1 is the first Chinese CMB experiment aiming for high precision measurement of Cosmic Microwave Background B-mode polarization. The telescope, currently under deployment in…
Self-calibration of photometric redshift scatter from DECaLS DR8 power spectrum and validation with simulated catalogues
Hui Peng, Haojie Xu, Le Zhang +2
The uncertainty in the photometric redshift estimation is one of the major systematics in weak lensing cosmology. The self-calibration method is able to reduce this systematics wit…
Cross-correlation of Planck CMB lensing with DESI galaxy groups
Zeyang Sun, Ji Yao, Fuyu Dong +3
We measure the cross-correlation between galaxy groups constructed from DESI Legacy Imaging Survey DR8 and \emph{Planck} CMB lensing, over overlapping sky area of 16876 …
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…
Detection of cross-correlation between CMB Lensing and low-density points
Fuyu Dong, Pengjie Zhang, Le Zhang +4
Low Density Points (LDPs, \citet{2019ApJ...874....7D}), obtained by removing high-density regions of observed galaxies, can trace the Large-Scale Structures (LSSs) of the universe.…
Fast scalar quadratic maximum likelihood estimators for the CMB B-mode power spectrum
Jiming Chen, Shamik Ghosh, Hao Liu +9
Constructing a fast and efficient estimator for the B-mode power spectrum of cosmic microwave background (CMB) is of critical importance for CMB science. For a general CMB survey,…
HIR4: Cosmological signatures imprinted on the cross correlation between 21-cm map and galaxy clustering
Feng Shi, Yong-Seon Song, Jacobo Asorey +5
We explore the cosmological multitracer synergies between an emission line galaxy distribution from the Dark Energy Spectroscopic Instrument and a Tianlai Project 21-cm intensity m…
HIR4: cosmology from a simulated neutral hydrogen full sky using Horizon Run 4
Jacobo Asorey, David Parkinson, Feng Shi +6
The distribution of cosmological neutral hydrogen will provide a new window into the large-scale structure of the Universe with the next generation of radio telescopes and surveys.…
Reconstructing simulated CMB polarization power spectra with the Analytical Blind Separation method
Larissa Santos, Jian Yao, Le Zhang +6
Multi-frequency observations are needed to separate the CMB from foregrounds and accurately extract cosmological information from the data. The Analytical Blind Separation (ABS) me…
Fractional Dark Matter decay: cosmological imprints and observational constraints
Linfeng Xiao, Le Zhang, Rui An +2
If a fraction of the Dark Matter decays into invisible and massless particles (so-called "dark radiation") with the decay rate (or inverse lifetime) ,…
Testing the ABS method with the simulated Planck temperature maps
Jian Yao, Le Zhang, Yuxi Zhao +3
In this study, we apply the Analytical method of Blind Separation (ABS) of the cosmic microwave background (CMB) from foregrounds to estimate the CMB temperature power spectrum fro…
Can Conformal and Disformal Couplings Between Dark Sectors Explain the EDGES 21cm Anomaly?
Linfeng Xiao, Rui An, Le Zhang +3
The recently announced result by EDGES points an unexpected excess in the 21 cm global brightness temperature from cosmic dawn at , potentially indicating new phenomena b…
Non-negative matrix factorization for self-calibration of photometric redshift scatter in weak lensing surveys
Le Zhang, Yu Yu, Pengjie Zhang
Photo-z error is one of the major sources of systematics degrading the accuracy of weak lensing cosmological inferences. Zhang et al. (2010) proposed a self-calibration method comb…
ABS: an Analytical method of Blind Separation of CMB from foregrounds
Pengjie Zhang, Jun Zhang, Le Zhang
Extracting CMB B-mode polarization from complicated foregrounds is a challenging task in searching for inflationary gravitational waves. We propose the ABS method as a blind and an…
Bayesian semi-blind component separation for foreground removal in interferometric 21-cm observations
Le Zhang, Emory F. Bunn, Ata Karakci +5
We present in this paper a new Bayesian semi-blind approach for foreground removal in observations of the 21-cm signal with interferometers. The technique, which we call HIEMICA (H…
Simulation of the analysis of interferometric microwave background polarization data
Emory F. Bunn, Ata Karakci, Paul M. Sutter +4
We present results from an end-to-end simulation pipeline interferometric observations of cosmic microwave background polarization. We use both maximum-likelihood and Gibbs samplin…
Systematic Effects in Interferometric Observations of the CMB Polarization
Ata Karakci, Le Zhang, P. M. Sutter +5
The detection of the primordial -mode spectrum of the polarized cosmic microwave background (CMB) signal may provide a probe of inflation. However, observation of such a faint s…
Bayesian Inference of Polarized CMB Power Spectra from Interferometric Data
Ata Karakci, P. M. Sutter, Le Zhang +5
Detection of B-mode polarization of the cosmic microwave background (CMB) radiation is one of the frontiers of observational cosmology. Because they are an order of magnitude faint…
Maximum likelihood analysis of systematic errors in interferometric observations of the cosmic microwave background
Le Zhang, Ata Karakci, Paul M. Sutter +5
We investigate the impact of instrumental systematic errors in interferometric measurements of the cosmic microwave background (CMB) temperature and polarization power spectra. We…
Indirect searches of dark matter
Le Zhang
If dark matter decays or annihilates into electrons and positrons, it can affect radiation and cosmic-ray backgrounds. We review a novel, more general analysis of constraints on de…