Angela Chen
A5091832182- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Relativity and Gravitational Theory
- Gamma-ray bursts and supernovae
- Molecular Junctions and Nanostructures
- Quantum Electrodynamics and Casimir Effect
- Photonic Crystals and Applications
- Technology Use by Older Adults
- Quantum and electron transport phenomena
- Porphyrin and Phthalocyanine Chemistry
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Random lasers and scattering media
- Physics of Superconductivity and Magnetism
- Acute Ischemic Stroke Management
- SARS-CoV-2 detection and testing
- Experimental and Theoretical Physics Studies
- Quantum Computing Algorithms and Architecture
- Advanced Electron Microscopy Techniques and Applications
- Orbital Angular Momentum in Optics
- Topological Materials and Phenomena
- Scientific Research and Discoveries
- Neural Networks and Reservoir Computing
Institute of Theoretical Physics
2025
University of Michigan
2018-2024
Kavli Institute for the Physics and Mathematics of the Universe
2022-2024
The University of Tokyo
2022-2024
Michigan United
2024
Beihua University
2023
The Scarborough Hospital
2022
University of Toronto
2022
Shanghai Jiao Tong University
2022
Presbyterian Hospital
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 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 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...
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.
We explore the impact of an update to typical approximation for shape noise term in analytic covariance matrix cosmic shear experiments that assumes absence survey boundary and mask effects. present exact expression number galaxy pairs this based on mask, which leads more than a factor three increase largest measured scales Kilo-Degree Survey (KIDS-450) real-space data. compare result several alternative methods measuring from data find excellent agreement. This resolves any internal model...
We present the first analysis of cosmic shear measured in DES Y3 that employs entire range angular scales data. To achieve this, we built upon recent advances theoretical modelling weak lensing provided by a combination N -body simulations, physical models baryonic processes, and neural networks. Specifically, used BACCOemu to model linear non-linear matter power spectrum including physics, allowing us robustly exploit smaller than those Collaboration. show additional data produce...
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has emerged as the cause of a worldwide pandemic. Many commercial SARS-CoV-2 reverse transcription-PCR (RT-PCR) assays have received Emergency Use Authorization from U.S. Food and Drug Administration. However, there are limited data describing their performance, in particular performance high-throughput RT-PCR systems. We analyzed diagnostic two systems: cobas 6800 Panther Fusion, associated assays, with collection 389...
ABSTRACT Measurements of large-scale structure are interpreted using theoretical predictions for the matter distribution, including potential impacts baryonic physics. We constrain feedback strength baryons jointly with cosmology weak lensing and galaxy clustering observables (3 × 2pt) Dark Energy Survey (DES) Year 1 data in combination external information from baryon acoustic oscillations (BAO) Planck cosmic microwave background polarization. Our modelling is informed by a set...
We use the small scales of Dark Energy Survey (DES) Year-3 cosmic shear measurements, which are excluded from DES cosmological analysis, to constrain baryonic feedback. To model feedback, we adopt a correction and numerical package \texttt{Baccoemu} accelerate evaluation nonlinear matter power spectrum. design our analysis pipeline focus on constraints suppression effects, utilizing implication given by principal component Fisher forecasts. Our constraint effects can then be used better...
We present a validation of the Dark Energy Survey Year 3 (DES Y3) $3\ifmmode\times\else\texttimes\fi{}2$-point analysis choices by testing them on Buzzard2.0, new suite cosmological simulations that is tailored for and combined galaxy clustering weak-lensing analyses. show buzzard2.0 accurately reproduce many important aspects DES Y3 data, including photometric redshift magnitude distributions, relevant set two-point statistics. then our model data vector accurate enough to recover true...
We generalize the vacuum-Unruh effect to arbitrary excited states in Fock space and find that Unruh mode at horizon induces coherent excitation on canonical background ensemble measured by an accelerated observer. When there is only one type of system, for example, ones outgoing from a black hole horizon, mapping density matrix maximal foliation vector spanned pseudothermal partitioned spacetime wedge one-to-one. Hence, we propose information particles inside collapsing shell; thus,...
ABSTRACT Extracting precise cosmology from weak lensing surveys requires modelling the non-linear matter power spectrum, which is suppressed at small scales due to baryonic feedback processes. However, hydrodynamical galaxy formation simulations make widely varying predictions for amplitude and extent of this effect. We use measurements Dark Energy Survey Year 3 (WL) Atacama Cosmology Telescope DR5 kinematic Sunyaev–Zel’dovich (kSZ) jointly constrain cosmological astrophysical parameters...
We study a phenomenological class of models where dark matter converts to radiation in the low redshift epoch. This models, dubbed DMDR, characterizes evolution comoving density with two extra parameters, and may be able help alleviate observed discrepancies between early- late-time probes universe. investigate how conversion affects key cosmological observables such as CMB temperature power spectra. Combining 3x2pt data from Year 1 Dark Energy Survey, {\it Planck}-2018 polarization data,...
Landslides are significant natural geological hazards. Landslide susceptibility evaluation involves the quantitative assessment and prediction of potential landslide locations their probabilities. Research has explored methods based on spatial-scale analysis. This integrates two models—global local scale—using a CNN model PSO-CNN coupled model. Key aspects include selecting factors optimizing parameters for at different scales. A major focus current research is utilizing results to enhance...
Spin chemistry of photogenerated spin-correlated radical pairs (SCRPs) offers a practical approach to control chemical reactions and molecular emissions by using weak magnetic fields. This capability harness field effects (MFEs) paves the way for developing SCRPs-based qubits. Here, we introduce new series donor-chiral bridge-acceptor (D-χ-A) molecules that demonstrate significant MFEs on fluorescence intensity lifetime in solution at room temperature─critical quantum sensing. By precisely...
ABSTRACT We cross-correlate positions of galaxies measured in data from the first three years Dark Energy Survey with Compton-y maps generated using South Pole Telescope (SPT) and Planck mission. model this cross-correlation measurement together galaxy autocorrelation to constrain distribution gas Universe. measure hydrostatic mass bias or, equivalently, mean halo bias-weighted electron pressure 〈bhPe 〉, large-scale information. find 〉 be...
We analyze Dark Energy Survey (DES) data to constrain a cosmological model where subset of parameters -- focusing on $\Omega_m$ are split into versions associated with structure growth (e.g. $\Omega_m^{\rm grow}$) and expansion history geo}$). Once the have been specified for $\Lambda$CDM model, which includes general relativity as theory gravity, it uniquely predicts evolution both geometry (distances) over cosmic time. Any inconsistency between measurements could therefore indicate...
We present the first analysis of cosmic shear measured in DES Y3 that employs entire range angular scales data. To achieve this, we build upon recent advances theoretical modelling weak lensing provided by a combination $N$-body simulations, physical models baryonic processes, and neural networks. Specifically, use BACCOemu to model linear nonlinear matter power spectrum including physics, allowing us robustly exploit smaller than those used Collaboration. show additional data produce...