Vivian Miranda
A5027412123- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Black Holes and Theoretical Physics
- Gaussian Processes and Bayesian Inference
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Relativity and Gravitational Theory
- Space Science and Extraterrestrial Life
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Measurement and Metrology Techniques
- Ionosphere and magnetosphere dynamics
- Advanced Mathematical Theories and Applications
- Impact of Light on Environment and Health
- Model Reduction and Neural Networks
- Biofield Effects and Biophysics
- Big Data Technologies and Applications
- Advanced Control Systems Optimization
Stony Brook University
2022-2024
University of Arizona
2019-2022
Harvard University Press
2020
University of Pennsylvania
2016-2019
Kitt Peak National Observatory
2019
University of Chicago
2012-2016
Ministry of Education
2012-2014
Universidade Federal do Rio de Janeiro
2009
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 Baryonic Acoustic Oscillation (BAO) data from the Dark Energy Spectroscopic Instrument (DESI), in combination with Cosmic Microwave Background (CMB) and Type Ia Supernovae (SN) luminosity distances, suggests a dynamical evolution of dark energy equation state phantom phase ( w < -1) past when so-called 0 parametrization ) = + (1- is assumed. In this work, we investigate more general models that also allow state. We consider three cases: an transition feature, model-agnostic...
We present the methodology for and detail implementation of Dark Energy Survey (DES) 3x2pt DES Year 1 (Y1) analysis, which combines configuration-space two-point statistics from three different cosmological probes: cosmic shear, galaxy-galaxy lensing, galaxy clustering, using data first year observations. have developed two independent modeling pipelines describe code validation process. derive expressions analytical real-space multi-probe covariances, their with numerical simulations....
We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample 207 spectroscopically confirmed SNe three years DES-SN, combined with low-redshift sample 122 literature. Our "DES-SN3YR" result these 329 is based on series companion analyses and improvements covering SN discovery, spectroscopic selection, photometry, calibration, distance bias corrections, evaluation...
We present the first joint analysis of cluster abundances and auto or cross-correlations three cosmic tracer fields: galaxy density, weak gravitational lensing shear, density split by optical richness. From a (4×2pt+N) abundances, cross-correlations, correlations measured from year data Dark Energy Survey, we obtain Ωm=0.305+0.055−0.038 σ8=0.783+0.064−0.054. This result is consistent with constraints DES-Y1 clustering two-point correlation functions for flat νΛCDM model. Consequently,...
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 The Wide Field InfraRed Survey Telescope ( WFIRST ) was the highest-ranked large space-based mission of 2010 New Worlds , Horizons decadal survey. It is now a NASA in formulation with planned launch mid 2020s. A primary objective to precisely constrain nature dark energy through multiple probes, including Type Ia supernovae (SN Ia). Here, we present first realistic simulations SN survey based on current hardware specifications and using open-source tools. We simulate light curves...
The largest structures in the cosmic web probe dynamical nature of dark energy through their integrated Sachs-Wolfe imprints. In strength signal, typical voids have shown good consistency with expectation $A_{\rm ISW}=\Delta T^{\rm data} / \Delta theory}=1$, given substantial variance. Discordantly, large-scale hills gravitational potential, or supervoids, excess signals. this study, we mapped out 87 new supervoids total 5000 deg$^2$ footprint Dark Energy Survey at $0.2<z<0.9$ to these...
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...
Abstract Early dark energy (EDE) is an extension to the ΛCDM model that includes additional density contribution near recombination. The was proposed reduce tension between measurements of Hubble constant H 0 from cosmic microwave background (CMB) and local distance ladder. Some analyses in recent literature have shown intriguing hints for EDE. However, this increases derived clustering galaxies (as measured by so-called S 8 parameter) CMB large scale structure (LSS) measurements. This new...
Several authors have argued that self-consistent $f(R)$ gravity models distinct from the cold dark matter model with a cosmological constant ($\ensuremath{\Lambda}\mathrm{CDM}$) are almost ruled out. Confronting such claims, we present particular two-parameter (a) is cosmologically viable and distinguishable $\ensuremath{\Lambda}\mathrm{CDM}$, (b) compatible existence of relativistic stars, (c) free singularities Ricci scalar during evolution, (d) allows addition high-curvature corrections...
In Dirac-Born-Infeld inflation, changes in the sound speed that transiently break slow-roll approximation lead to features power spectrum. We develop and test generalized for calculating such effects show it can be extended treat order unity features. As slow-roll, model independent constraints on potential of canonical inflation directly reinterpreted context through this approximation. particular, a sharp horizon scale step warped brane tension explain oscillatory WMAP7 CMB spectrum as...
Abstract We present the analysis underpinning measurement of cosmological parameters from 207 spectroscopically classified SNe Ia first 3 years Dark Energy Survey Supernova Program (DES-SN), spanning a redshift range 0.017 < z 0.849. combine DES-SN sample with an external 122 low-redshift ( 0.1) Ia, resulting in “DES-SN3YR” 329 Ia. Our analyses are blinded: after combining our DES-SN3YR distances constraints Cosmic Microwave Background, uncertainties dark energy equation-of-state...
We explore synergies between the space-based Wide-Field Infrared Survey Telescope (WFIRST) and ground-based Rubin Observatory Legacy of Space Time (LSST). In particular, we consider a scenario where currently envisioned survey strategy for WFIRST's High Latitude (HLS), i.e., 2000 square degrees in four narrow photometric bands is altered favor that combines rapid coverage LSST area (to full depth) one band. find 5-month WFIRST W-band can cover providing high-resolution imaging >95% Year...
CMB-HD is a proposed millimeter-wave survey over half the sky that would be ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at 150 GHz). Such answer many outstanding questions about fundamental physics of Universe. Major advances 1.) use gravitational lensing primordial microwave background to map distribution matter on small scales (k~10 h Mpc^(-1)), which probes dark particle properties. It will also allow 2.) measurements thermal kinetic Sunyaev-Zel'dovich...
We extend and improve the modeling analysis of large-amplitude, sharp inflationary steps for second order corrections required by precision Planck cosmic microwave background power spectrum arbitrary Dirac-Born-Infeld sound speed. With two parameters, amplitude frequency resulting oscillations, step models fit $\mathrm{\ensuremath{\Delta}}{\ensuremath{\chi}}^{2}=\ensuremath{-}11.4$. Evidence oscillations damping before beam scale is weak: only improves to...
We develop an integral form for the bispectrum in general single-field inflation whose domain of validity includes models where background evolution is not constrained to be slowly varying everywhere. Our preserves squeezed-limit consistency relation, allows fast evaluation all triangle configurations expediting efficient comparison slow-roll violating with data, and provides complete compact expressions correct first order parameters. Motivated by recent Planck results, we consider as...
The recent BICEP2 B-mode polarization determination of an inflationary tensor-scalar ratio $r=0.2^{+0.07}_{-0.05}$ is in tension with simple scale-free models inflation due to a lack corresponding low multipole excess the temperature power spectrum which places limit $r_{0.002}<0.11$ (95% CL) on such models. Single-field that reconcile these two observations, even those where tilt runs substantially, introduce scale into scalar spectrum. To cancel tensor excess, and simultaneously explain...
We conduct an analysis of the Planck 2015 data that is complete in reionization observables from large angle polarization $E$-mode spectrum redshift range $6<z<30$. Based on 5 principal components, all which are constrained by data, this single can be used to infer constraints any model for same range; we develop effective likelihood approach applying these models. By allowing arbitrary ionization history, technique tests robustness inferences total optical depth usual steplike transition...