A5084587123- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Impact of Light on Environment and Health
- Statistical and numerical algorithms
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Big Data Technologies and Applications
- Gaussian Processes and Bayesian Inference
- Tribology and Lubrication Engineering
- Spectroscopy Techniques in Biomedical and Chemical Research
- Geophysics and Gravity Measurements
- Advanced Data Storage Technologies
- Particle physics theoretical and experimental studies
- Bayesian Methods and Mixture Models
- Diffusion Coefficients in Liquids
University of Pennsylvania
2019-2025
Laboratoire de Physique Subatomique et de Cosmologie
2022-2025
Université Grenoble Alpes
2023-2025
Centre National de la Recherche Scientifique
2016-2025
California University of Pennsylvania
2024-2025
Institut National de Physique Nucléaire et de Physique des Particules
2023-2024
University of Chicago
2023
Fermi National Accelerator Laboratory
2022
Campbell Collaboration
2021
Laboratoire AstroParticule et Cosmologie
2016-2020
We present the first cosmology results from large-scale structure in Dark Energy Survey (DES) spanning 5000 deg$^2$. perform an analysis combining three two-point correlation functions (3$\times$2pt): (i) cosmic shear using 100 million source galaxies, (ii) galaxy clustering, and (iii) cross-correlation of with lens positions. The was designed to mitigate confirmation or observer bias; we describe specific changes made sample following unblinding results. model data within flat $\Lambda$CDM...
This work, together with its companion paper, Secco and Samuroff et al. (2021), presents the Dark Energy Survey Year 3 cosmic shear measurements cosmological constraints based on an analysis of over 100 million source galaxies. With data spanning 4143 deg$^2$ sky, divided into four redshift bins, we produce highest significance measurement to date, a signal-to-noise 40. We conduct blind in context $\Lambda$CDM model find 3% constraint clustering amplitude, $S_8\equiv \sigma_8 (\Omega_{\rm...
This work and its companion paper, Amon et al. (2021), present cosmic shear measurements cosmological constraints from over 100 million source galaxies in the Dark Energy Survey (DES) Year 3 data. We constrain lensing amplitude parameter $S_8\equiv\sigma_8\sqrt{\Omega_\textrm{m}/0.3}$ at 3% level $\Lambda$CDM: $S_8=0.759^{+0.025}_{-0.023}$ (68% CL). Our constraint is 2% when using angular scale cuts that are optimized for $\Lambda$CDM analysis: $S_8=0.772^{+0.018}_{-0.017}$ With alone, we...
ABSTRACT We present and characterize the galaxy shape catalogue from first 3 yr of Dark Energy Survey (DES) observations, over an effective area 4143 deg2 southern sky. describe our data analysis process self-calibrating shear measurement pipeline metacalibration, which builds improves upon used in DES Year 1 several aspects. The weak-lensing consists 100 204 026 galaxies, measured riz bands, resulting a weighted source number density neff = 5.59 gal arcmin−2 corresponding noise σe 0.261....
We present a joint cosmic shear analysis of the Dark Energy Survey (DES Y3) and Kilo-Degree (KiDS-1000) in collaborative effort between two survey teams. find consistent cosmological parameter constraints DES Y3 KiDS-1000 which, when combined joint-survey analysis, constrain $S_8 = \sigma_8 \sqrt{\Omega_{\rm m}/0.3}$ with mean value $0.790^{+0.018}_{-0.014}$. The marginal is lower than maximum posteriori estimate, $S_8=0.801$, owing to skewness distribution projection effects...
The authors use Dark Energy Survey data on galaxy clustering and lensing from the first three years of observations combined with five prominent external datasets. They robustly constrain six potential extensions to currently prevalent cosmological paradigm \ensuremath{\Lambda}CDM (Cold Matter a constant). All would add significant new physics, such as deviations General Relativity or non-zero spatial curvature, but no evidence for physics is found.
Abstract We present cosmological constraints from the sample of Type Ia supernovae (SNe Ia) discovered and measured during full 5 yr Dark Energy Survey (DES) SN program. In contrast to most previous samples, in which SNe are classified based on their spectra, we classify DES using a machine learning algorithm applied light curves four photometric bands. Spectroscopic redshifts acquired dedicated follow-up survey host galaxies. After accounting for likelihood each being an Ia, find 1635...
We present cosmological constraints from the analysis of two-point correlation functions between galaxy positions and lensing measured in Dark Energy Survey (DES) Year 3 data measurements cosmic microwave background (CMB) South Pole Telescope (SPT) Planck. When jointly analyzing DES-only DES cross-correlations with SPT+Planck CMB lensing, we find Ωm=0.344±0.030 S8≡σ8(Ωm/0.3)0.5=0.773±0.016, assuming ΛCDM. additionally combining autospectrum, Ωm=0.306+0.018−0.021 S8=0.792±0.012. The high...
We present a measurement of the cross-correlation between MagLim galaxies selected from Dark Energy Survey (DES) first three years observations (Y3) and cosmic microwave background (CMB) lensing Atacama Cosmology Telescope (ACT) Data Release 4 (DR4), reconstructed over $\sim 436$ sq.deg. sky. Our galaxy sample, which covers 4143$ sq.deg., is divided into six redshift bins spanning range $0.20<z<1.05$. adopt blinding procedure until passing all consistency systematics tests. After imposing...
We simulate the scientific performance of Wide-Field Infrared Survey Telescope (WFIRST) High Latitude (HLS) on dark energy and modified gravity. The 1.6 year HLS Reference survey is currently envisioned to image 2000 deg$^2$ in multiple bands a depth $\sim$26.5 Y, J, H cover same area with slit-less spectroscopy beyond z=3. combination deep, multi-band photometry deep will allow scientists measure growth geometry Universe through variety cosmological probes (e.g., weak lensing, galaxy...
ABSTRACT We describe and test the fiducial covariance matrix model for combined two-point function analysis of Dark Energy Survey Year 3 (DES-Y3) data set. Using a variety new ansatzes modelling testing, we validate assumptions approximations this model. These include assumption Gaussian likelihood, trispectrum contribution to covariance, impact evaluating at wrong set parameters, masking survey geometry, deviations from Poissonian shot noise, galaxy weighting schemes, other sub-dominant...
ABSTRACT We present reconstructed convergence maps, mass from the Dark Energy Survey (DES) third year (Y3) weak gravitational lensing data set. The maps are weighted projections of density field (primarily dark matter) in foreground observed galaxies. use four reconstruction methods, each is a maximum posteriori estimate with different model for prior probability map: Kaiser–Squires, null B-mode prior, Gaussian and sparsity prior. All methods implemented on celestial sphere to accommodate...
We constrain cosmological and galaxy-bias parameters using the combination of galaxy clustering galaxy-galaxy lensing measurements from Dark Energy Survey Year-3 data. describe our modeling framework, choice scales analyzed, validating their robustness to theoretical uncertainties in small-scale by analyzing simulated Using a linear bias model redMaGiC sample, we obtain constraints on matter density be $\Omega_{\rm m} = 0.325^{+0.033}_{-0.034}$. also implement non-linear probe smaller that...
ABSTRACT We evaluate the consistency between lensing and clustering based on measurements from Baryon Oscillation Spectroscopic Survey combined with galaxy–galaxy Dark Energy (DES) Year 3, Hyper Suprime-Cam Subaru Strategic Program (HSC) 1, Kilo-Degree (KiDS)-1000. find good agreement these data sets. model observations using Emulator fit at two fixed cosmologies: Planck (S8 = 0.83), a Lensing cosmology 0.76). For joint analysis limited to large scales, we that both cosmologies provide an...
Quantifying tensions -- inconsistencies amongst measurements of cosmological parameters by different experiments has emerged as a crucial part modern data analysis. Statistically-significant between two or probes may indicate new physics extending beyond the standard model and need to be promptly identified. We apply several tension estimators proposed in literature Dark Energy Survey (DES) large-scale structure measurement Planck cosmic microwave background data. first evaluate...
We constrain the matter density $\Omega_{\mathrm{m}}$ and amplitude of fluctuations $\sigma_8$ within $\Lambda$CDM cosmological model with shear peak statistics angular convergence power spectra using mass maps constructed from first three years data Dark Energy Survey (DES Y3). use tomographic statistics, including cross-peaks: counts calculated on created by taking a harmonic space product two redshift bins. Our analysis follows forward-modelling scheme to create likelihood these N-body...
The cosmological information extracted from photometric surveys is most robust when multiple probes of the large scale structure Universe are used. Two sensitive clustering galaxies and tangential shear background galaxy shapes produced by those foreground galaxies, so-called galaxy-galaxy lensing. Combining measurements these two two-point functions leads to constraints that independent way trace matter (the bias factor). optimal choice foreground, or lens, governed joint, but conflicting...
We present cosmological constraints from the analysis of angular power spectra cosmic shear maps based on data first three years observations by Dark Energy Survey (DES Y3). Our measurements are pseudo-$C_\ell$ method and offer a view complementary to that two-point correlation functions in real space, as two estimators known compress select Gaussian information different ways, due scale cuts. They may also be differently affected systematic effects theoretical uncertainties, such baryons...
We present a cosmological analysis using the second and third moments of weak lensing mass (convergence) maps from first three years data (Y3) Dark Energy Survey. The survey spans an effective area 4139 square degrees uses images over 100 million galaxies to reconstruct convergence field. moment as function smoothing scale contains information similar standard shear 2-point statistics. moment, or skewness, additional non-Gaussian information. is analyzed in context...
We present and characterize the galaxy-galaxy lensing signal measured using first three years of data from Dark Energy Survey (DES Y3) covering 4132 deg$^2$. These measurements are used in DES Y3 3$\times$2pt cosmological analysis, which combines weak galaxy clustering information. use two lens samples: a magnitude-limited sample redMaGic sample, span redshift range $\sim 0.2-1$ with 10.7 M 2.6 galaxies respectively. For source catalog, we Metacalibration shape consisting $\simeq$100...
Cross-correlations of galaxy positions and shears with maps gravitational lensing the cosmic microwave background (CMB) are sensitive to distribution large-scale structure in Universe. Such cross-correlations also expected be immune some systematic effects that complicate correlation measurements internal surveys. We present modeling between measured first three years data from Dark Energy Survey CMB derived a combination 2500 deg2 SPT-SZ survey conducted South Pole Telescope full-sky Planck...
We study the effect of magnification in Dark Energy Survey Year 3 analysis galaxy clustering and galaxy-galaxy lensing, using two different lens samples: a sample Luminous red galaxies, redMaGiC, with redshift-dependent magnitude limit, MagLim. account for on both flux size selection accounting systematic effects Balrog image simulations. estimate impact lensing cosmology analysis, finding it to be significant MagLim sample. show cosmological constraints from auto-correlation signal...
ABSTRACT We present direct constraints on galaxy intrinsic alignments (IAs) using the Dark Energy Survey Year 3 (DES Y3), Extended Baryon Oscillation Spectroscopic (eBOSS), and its precursor, (BOSS). Our measurements incorporate photometric red sequence (redMaGiC) galaxies from DES with median redshift z ∼ 0.2–1.0, luminous eBOSS at 0.8, also an SDSS-III BOSS CMASS sample 0.5. measure two-point IA correlations, which we fit a model that includes lensing, magnification, error. Fitting scales...
Beyond-two-point statistics contain additional information on cosmological as well astrophysical and observational (systematics) parameters. In this methodology paper we provide an end-to-end simulation-based analysis of a set Gaussian non-Gaussian weak lensing using detailed mock catalogs the Dark Energy Survey (DES). We implement: 1) second third moments; 2) wavelet phase harmonics (WPH); 3) scattering transform (ST). Our is fully based simulations, it spans space seven νwCDM parameters,...