Dragan Huterer
A5083137000- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Scientific Research and Discoveries
- Relativity and Gravitational Theory
- Computational Physics and Python Applications
- Particle physics theoretical and experimental studies
- Gaussian Processes and Bayesian Inference
- Astronomical Observations and Instrumentation
- Statistical and numerical algorithms
- Space Science and Extraterrestrial Life
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Advanced Mathematical Theories
University of Michigan–Ann Arbor
2016-2025
Michigan United
2002-2025
Ludwig-Maximilians-Universität München
2024
Lancaster University
2024
Centre National de la Recherche Scientifique
2003-2024
Aix-Marseille Université
2024
Austin Peay State University
2024
University of Zurich
2024
American Public University System
2024
Stanford University
2024
Ten years ago, the discovery that expansion of universe is accelerating put in place last major building block present cosmological model, which composed 4% baryons, 20% dark matter, and 76% energy. At same time, it posed one most profound mysteries all science, with deep connections to both astrophysics particle physics. Cosmic acceleration could arise from repulsive gravity energy—for example, quantum energy vacuum—or may signal general relativity (GR) breaks down on scales must be...
We present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg$^2$ $griz$ imaging data the first year Dark Energy Survey (DES Y1). combine three two-point functions: (i) cosmic shear correlation function 26 million source galaxies in four redshift bins, (ii) angular autocorrelation 650,000 luminous red five (iii) galaxy-shear cross-correlation positions shears. To demonstrate robustness these results, we use independent pairs...
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...
We study the effect of primordial non-Gaussianity on large-scale structure, focusing upon most massive virialized objects. Using analytic arguments and $N$-body simulations, we calculate mass function clustering dark matter halos across a range redshifts levels non-Gaussianity. propose simple fitting for valid entire our simulations. find pronounced effects halos, leading to strongly scale-dependent bias. This suggests that rare objects may provide sensitive probe very roughly estimate...
Abstract We describe the first public data release of Dark Energy Survey, DES DR1, consisting reduced single-epoch images, co-added source catalogs, and associated products services assembled over 3 yr science operations. DR1 is based on optical/near-infrared imaging from 345 distinct nights (2013 August to 2016 February) by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. wide-area survey covering ∼5000 deg 2 southern Galactic cap five broad...
We use 26×106 galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg2 of sky to produce most significant measurement cosmic shear in a galaxy survey date. constrain cosmological parameters both flat ΛCDM and wCDM models, while also varying neutrino mass density. These results are shown be robust using two independent catalogs, photo-z calibration methods, analysis pipelines blind analysis. find 3.5% fractional uncertainty on σ8(Ωm/0.3)0.5=0.782+0.027−0.027 at 68%...
The presence of dark energy in the Universe is inferred directly from accelerated expansion Universe, and, indirectly, measurements cosmic microwave background (CMB) anisotropy. Dark contributes about two-thirds critical density, smoothly distributed, has large negative pressure, and very mysterious. For now, all its discernible cosmological consequences follow effect on rate Universe. Absent a compelling theoretical model (or even class models), we describe by equation state...
The large-angle (low-l) correlations of the cosmic microwave background exhibit several statistically significant anomalies compared to standard inflationary cosmology. We show that quadrupole plane and three octopole planes are far more aligned than previously thought (99.9% C.L.). Three these orthogonal ecliptic at 99.1% C.L., normals 99.6% C.L. with direction cosmological dipole equinoxes. remaining is supergalactic
Distance measurements to type Ia supernovae (SNe Ia) indicate that the Universe is accelerating and two-thirds of critical energy density exists in a dark-energy component with negative pressure. SNe can be used distinguish between different possibilities for dark energy, if it an evolving scalar field, reconstruct scalar-field potential. We derive reconstruction equations address feasibility this approach by Monte Carlo simulation.
We study the impact of systematic errors on planned weak lensing surveys and compute requirements their contributions so that they are not a dominant source cosmological parameter error budget. The generic types we consider multiplicative additive in measurements shear, as well photometric redshift errors. In general, more powerful have stronger requirements. For example, for SNAP-type survey shear needs to be smaller than 1%(fsky/0.025)^{-1/2} mean any given bin, while centroids bins need...
Type Ia supernova data have recently become strong enough to enable, for the first time, constraints on time variation of dark energy density and its equation state. Most analyses, however, are using simple two or three-parameter descriptions evolution, since it is well known that allowing more degrees freedom introduces serious degeneracies. Here we present a method produce uncorrelated nearly model-independent band power estimates state as function redshift. We apply compiled data. Our...
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...
We combine Dark Energy Survey Year 1 clustering and weak lensing data with Baryon Acoustic Oscillations (BAO) Big Bang Nucleosynthesis (BBN) experiments to constrain the Hubble constant. Assuming a flat $\Lambda$CDM model minimal neutrino mass ($\sum m_\nu = 0.06$ eV) we find $H_0=67.2^{+1.2}_{-1.0}$ km/s/Mpc (68% CL). This result is completely independent of constant measurements based on distance ladder, Cosmic Microwave Background (CMB) anisotropies (both temperature polarization), strong...
We perform a comprehensive study of Milky Way (MW) satellite galaxies to constrain the fundamental properties dark matter (DM). This analysis fully incorporates inhomogeneities in spatial distribution and detectability MW satellites marginalizes over uncertainties mapping between DM halos, system, disruption subhalos by disk. Our results are consistent with cold, collisionless paradigm yield strongest cosmological constraints date on particle models warm, interacting, fuzzy matter. At 95%...
We present an improved measurement of the Hubble constant (H_0) using 'inverse distance ladder' method, which adds information from 207 Type Ia supernovae (SNe Ia) Dark Energy Survey (DES) at redshift 0.018 < z 0.85 to existing measurements 122 low (z 0.07) SNe (Low-z) and Baryon Acoustic Oscillations (BAOs). Whereas traditional H_0 with use a ladder parallax Cepheid variable stars, inverse relies on absolute BAOs calibrate intrinsic magnitude Ia. find = 67.8 +/- 1.3 km s-1 Mpc-1...
We present constraints on extensions of the minimal cosmological models dominated by dark matter and energy, $\Lambda$CDM $w$CDM, using a combined analysis galaxy clustering weak gravitational lensing from first-year data Dark Energy Survey (DES Y1) in combination with external data. consider four energy-dominated scenarios: 1) nonzero curvature $\Omega_k$, 2) number relativistic species $N_{\rm eff}$ different standard value 3.046, 3) time-varying equation-of-state energy described...
ABSTRACT We present a blind time-delay cosmographic analysis for the lens system DES J0408−5354. This is extraordinary presence of two sets multiple images at different redshifts, which provide opportunity to obtain more information cost increased modelling complexity with respect previously analysed systems. perform detailed mass distribution this using three band Hubble Space Telescope imaging. combine measured time delays, line-of-sight central velocity dispersion deflector, and...
Several unexpected features have been observed in the microwave sky at large angular scales, both by WMAP an Planck. Among those is a lack of variance and correlation on largest alignment lowest multipole moments with one another motion geometry Solar System, hemispherical power asymmetry or dipolar modulation, preference for odd parity modes unexpectedly cold spot Southern hemisphere. The individual p-values significance these are per mille to cent level, when compared expectations best-fit...
We describe the Dark Energy Survey (DES) photometric data set assembled from first three years of science operations to support DES Year 3 cosmology analyses, and provide usage notes aimed at broad astrophysics community. Y3 Gold improves on previous releases DES, Y1 Data Release 1 (DES DR1), presenting an expanded curated that incorporates algorithmic developments in image detrending processing, calibration, object classification. comprises nearly 5000 square degrees grizY imaging south...
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....
Determining the distribution of redshifts galaxies observed by wide-field photometric experiments like Dark Energy Survey is an essential component to mapping matter density field with gravitational lensing. In this work we describe methods used assign individual weak lensing source from Year 3 Weak Lensing Source Catalogue four tomographic bins and estimate redshift distributions in these bins. As first application data, validate that assumptions made apply DES Y3 develop a full treatment...