A5065163729- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
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- Stellar, planetary, and galactic studies
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University of South Carolina
2025
Johns Hopkins University
2014-2024
University of Maryland, College Park
2018
Lawrence Livermore National Laboratory
1994-2018
Medical University of South Carolina
2014
American Society of Clinical Oncology
2010
Duke University
2010
Medical College of Wisconsin
2010
University of Bern
2010
Institute of Social and Preventive Medicine
2010
WMAP precision data enables accurate testing of cosmological models. We find that the emerging standard model cosmology, a flat Lambda-dominated universe seeded by nearly scale-invariant adiabatic Gaussian fluctuations, fits data. With parameters fixed only data, we can fit finer scale CMB measurements and large scle structure (galaxy surveys Lyman alpha forest). This simple is also consistent with host other astronomical measurements. then to combination experiments (ACBAR CBI), 2dFGRS...
SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP*) OBSERVATIONS: COSMOLOGICAL INTERPRETATION, E. Komatsu, K. M. Smith, J. Dunkley, C. L. Bennett, B. Gold, G. Hinshaw, N. Jarosik, D. Larson, R. Nolta, Page, Spergel, Halpern, S. Hill, A. Kogut, Limon, Meyer, Odegard, Tucker, Weiland, Wollack, Wright
A simple cosmological model with only six parameters (matter density, Ωmh2, baryon Ωbh2, Hubble constant, H0, amplitude of fluctuations, σ8, optical depth, τ, and a slope for the scalar perturbation spectrum, ns) fits not 3 year WMAP temperature polarization data, but also small-scale CMB light element abundances, large-scale structure observations, supernova luminosity/distance relationship. Using data only, best-fit values power-law flat Λ cold dark matter (ΛCDM) are (Ωmh2,Ωbh2,h,ns,τ,σ8)...
(Abridged) The WMAP 5-year data strongly limit deviations from the minimal LCDM model. We constrain physics of inflation via Gaussianity, adiabaticity, power spectrum shape, gravitational waves, and spatial curvature. also properties dark energy, parity-violation, neutrinos. detect no convincing parameters model, derived combined with distance measurements Type Ia supernovae (SN) Baryon Acoustic Oscillations (BAO), are: Omega_b=0.0456+-0.0015, Omega_c=0.228+-0.013, Omega_Lambda=0.726+-0.015,...
We present full sky microwave maps in five bands (23 to 94 GHz) from the WMAP first year survey. Calibration errors are <0.5% and low systematic error level is well specified. The 21 per mode l=658. temperature-polarization cross-power spectrum reveals both acoustic features a large angle correlation reionization. optical depth of reionization 0.17 +/- 0.04, which implies epoch 180+220-80 Myr (95% CL) after Big Bang at redshift 20+10-9 for range ionization scenarios. This early...
We present cosmological parameter constraints based on the final nine-year Wilkinson Microwave Anisotropy Probe (WMAP) data, in conjunction with a number of additional data sets. The WMAP alone, and combination, continue to be remarkably well fit by six-parameter ΛCDM model. When are combined measurements high-l cosmic microwave background anisotropy, baryon acoustic oscillation scale, Hubble constant, matter energy densities, Ωbh2, Ωch2, ΩΛ, each determined precision ∼1.5%. amplitude...
view Abstract Citations (2594) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Structure in the COBE Differential Microwave Radiometer First-Year Maps Smoot, G. F. ; Bennett, C. L. Kogut, A. Wright, E. Aymon, J. Boggess, N. W. Cheng, S. de Amici, Gulkis, Hauser, M. Hinshaw, Jackson, P. D. Janssen, Kaita, Kelsall, T. Keegstra, Lineweaver, Loewenstein, K. Lubin, Mather, Meyer, Moseley, H. Murdock, Rokke, Silverberg, R. Tenorio, Weiss, Wilkinson,...
The Wilkinson Microwave Anisotropy Probe WMAP has mapped the entire sky in five frequency bands between 23 and 94 GHz with polarization sensitive radiometers. We present three-year full-sky maps of analyze them for foreground emission cosmological implications. These observations open up a new window understanding universe. observes significant levels polarized due to both Galactic synchrotron radiation thermal dust emission. least contaminated channel is at 61 GHz. Informed by model...
We present the final nine-year maps and basic results from WMAP mission. provide new full sky temperature that were processed to reduce asymmetry of effective beams. Temperature polarization are examined separate CMB anisotropy foreground emission, both types signals analyzed in detail. The mission has resulted a highly constrained LCDM cosmological model with precise accurate parameters agreement host other measurements. When data combined finer scale CMB, baryon acoustic oscillation,...
This paper focuses on cosmological constraints derived from analysis of WMAP data alone. A simple ΛCDM model fits the five-year temperature and polarization data. The basic parameters are consistent with three-year now better constrained: Ωbh2 = 0.02273 ± 0.00062, Ωch2 0.1099 0.0062, ΩΛ 0.742 0.030, ns 0.963+0.014−0.015, τ 0.087 0.017, σ8 0.796 0.036, h 0.719+0.026−0.027. With five years data, we have measured optical depth to reionization, τ>0, at 5σ significance. redshift an instantaneous...
We present new full-sky temperature and polarization maps in five frequency bands from 23 to 94 GHz, based on data the first years of Wilkinson Microwave Anisotropy Probe (WMAP) sky survey. The are consistent with previous more sensitive. five-year incorporate several improvements processing made possible by additional a complete analysis instrument calibration in-flight beam response. tests for systematic errors conclude that W-band is not yet suitable cosmological studies, but we suggest...
The WMAP mission has produced sky maps from seven years of observations at L2. We present the angular power spectra derived seven-year and discuss cosmological conclusions that can be inferred data alone. With data, temperature (TT) spectrum measurement a signal-to-noise ratio per multipole exceeds unity for l < 919; in band powers width Δl = 10, up to 1060. third acoustic peak TT is now well measured by WMAP. In context flat ΛCDM model, this improvement allows us place tighter constraints...
The cosmic microwave background radiation provides unique constraints on cosmological models. In this Letter we present a summary of the spatial properties based full 4 years COBE DMR observations, as detailed in set companion Letters. anisotropy is consistent with scale-invariant power law model and Gaussian statistics. With use multi-frequency 4-year data, including our estimate effects Galactic emission, find power-law spectral index $n=1.2\pm 0.3$ quadrupole normalization...
We confront predictions of inflationary scenarios with the WMAP data, in combination complementary small-scale CMB measurements and large-scale structure data. The detection a large-angle anti-correlation temperature--polarization cross-power spectrum is signature adiabatic superhorizon fluctuations at time decoupling. data are described by pure fluctuations: we place an upper limit on correlated CDM isocurvature component. Using constraints shape scalar power amplitude gravity waves,...
New full-sky temperature and polarization maps based on seven years of data from WMAP are presented. The new results consistent with previous results, but have improved due to reduced noise the additional integration time, knowledge instrument performance, analysis procedures. improvements described in detail. seven-year set is well fit by a minimal six-parameter flat ΛCDM model. parameters for this model, using conjunction baryon acoustic oscillation Sloan Digital Sky Survey priors H0...
The WMAP mission has mapped the full sky to determine geometry, content, and evolution of universe. Full-sky maps are made in five microwave frequency bands separate temperature anisotropy cosmic background (CMB) from foreground emission, including diffuse Galactic emission extragalactic point sources. We define masks that excise regions high so CMB analyses can be carried out with minimal contamination. also present spectra individual components, leading an improved understanding...
We present new full-sky temperature maps in five frequency bands from 23 to 94 GHz, based on the first three years of WMAP sky survey. The maps, which are consistent with first-year and more sensitive, incorporate improvements data processing made possible by additional a complete analysis polarization signal. These include refinements gain calibration beam response models. employ two forms multi-frequency separate astrophysical foreground signals CMB, each improves our analyses. First, we...
The Wilkinson Microwave Anisotropy Probe (WMAP) has mapped the full sky in Stokes I, Q, and U parameters at frequencies of 23, 33, 41, 61, 94 GHz. We detect correlations between temperature polarization maps significant more than 10 σ. are inconsistent with instrument noise significantly larger upper limits established for potential systematic errors. present all WMAP frequency bands similar amplitude from 23 to GHz consistent a superposition cosmic microwave background (CMB) signal weak...
We present the angular power spectrum derived from first-year Wilkinson Microwave Anisotropy Probe (WMAP) sky maps. study a variety of estimation methods and data combinations demonstrate that results are robust. The modestly contaminated by diffuse Galactic foreground emission, but we show simple template model is sufficient to remove signal. Point sources produce modest contamination in low frequency data. After masking ~700 known bright maps, estimate residual contribute ~3500 uK^2 at 41...
view Abstract Citations (710) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurement of the Cosmic Microwave Background Spectrum by COBE FIRAS Instrument Mather, J. C. ; Cheng, E. S. Cottingham, D. A. Eplee, R. E., Jr. Fixsen, Hewagama, T. Isaacman, B. Jensen, K. Meyer, Noerdlinger, P. Read, M. Rosen, L. Shafer, Wright, Bennett, Boggess, N. W. Hauser, G. Kelsall, Moseley, H., Silverberg, F. Smoot, Weiss, Wilkinson, The cosmic microwave...
The COBE FIRAS data contain foreground emission from interplanetary, Galactic interstellar dust and extragalactic background emission. We use three different methods to separate the various components, derive spectrum of far-infrared (FIRB). Each method relies on a set assumptions, which affect FIRB in ways. Despite this, spectra derived by these are remarkably similar. average that we ν = 5-80 cm-1 (2000-125 μm) frequency interval is I(ν) (1.3 ± 0.4) × 10-5(ν/ν0)0.64±0.12Pν(18.5 1.2 K),...
We present limits to the amplitude of non-Gaussian primordial fluctuations in WMAP 1-year cosmic microwave background sky maps. A non-linear coupling parameter, f_NL, characterizes a quadratic term potential. use two statistics: one is cubic statistic which measures phase correlations temperature after combining all configurations angular bispectrum. The other uses Minkowski functionals measure morphology Both methods find data consistent with Gaussian and establish limits, -58
(Abridged) A simple six-parameter LCDM model provides a successful fit to WMAP data, both when the data are analyzed alone and in combination with other cosmological data. Even so, it is appropriate search for any hints of deviations from now standard cosmology, which includes inflation, dark energy, matter, baryons, neutrinos. The community has subjected extensive varied analyses. While there widespread agreement as overall success model, various "anomalies" have been reported relative that...
view Abstract Citations (590) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Preliminary Measurement of the Cosmic Microwave Background Spectrum by Explorer (COBE) Satellite Mather, J. C. ; Cheng, E. S. Eplee, R. E., Jr. Isaacman, B. Meyer, Shafer, A. Weiss, Wright, L. Bennett, Boggess, N. W. Dwek, Gulkis, Hauser, M. G. Janssen, Kelsall, T. Lubin, P. Moseley, H., Murdock, Silverberg, F. Smoot, Wilkinson, D. We present a preliminary spectrum...
We describe our methodology for comparing the Wilkinson Microwave Anisotropy Probe (WMAP) measurements of cosmic microwave background (CMB) and other complementary data sets to theoretical models. The unprecedented quality WMAP tight constraints on cosmological parameters that are derived require a rigorous analysis so approximations made in modeling do not lead significant biases. use likelihood function characterize statistical properties sky. outline Monte Carlo Markov Chains explore...