Cosmic Microwave Background Radiation
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. The shape of space after WMAP data
What is the shape of space is a long-standing question in cosmology. I review recent advances in cosmic topology since it has entered a new era of experimental tests. High redshift surveys of astronomical sources and accurate maps of the Cosmic Microwave Background radiation (CMB) are beginning to hint at the shape of the universe, or at least to limit the w
Brazilian Journal of Physics. Publicado em: 2006-03
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14. Análise da aplicação do filtro wiener ao tratamento de dados da radiação cósmica de fundo obtido pelo telescópio / Analysis of the aplication of a wiener filter to the cosmic microwave background data processing from the beast telescope
Este trabalho apresenta a implementação do filltro Wiener para remoção de um ruído proporcional ao inverso da freqüência (x 1/f) presente nos dados do experimento BEAST, estabelecendo uma comparação entre seu desempenho e o do filtro atualmente utilizado (Passa altas) na análise de dados. O ruído 1/f aumenta a potência total do sinal em baixas fr
Publicado em: 2004
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15. Um processo Otimizado de produção de mapas da radiação cósmica de fundo em microondas / An optimized process of production of cosmic microwave backgroud radiation maps
The current work describes the optimization and parallelization of the software for the production of Cosmic Microwave Background (CMB) radiation maps in a distributed memory architecture. Initially, the Fortran code was ported to Fortran 90 and to High Performance Fortran (HPF) and run in a SMP (Shared Memory Processor) machine. In order to provide timing i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/03/2003
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16. Medidas de anisotropias da radiação cósmica de fundo em microondas em médias escalas angulares nas frequências de 30 GHz E 41 GHz / Anisotropy measurements of the cosmic microwave background radiation at intermediate angular scale at 30 GHz and 42 GHz
Neste trabalho são apresentados os resultados preliminares da análise de medidas de anisotropias da distribuição angular de temperatura da Radiação Cósmica de Fundo em micro-ondas (\textit{RCFM}) obtidas com o telescópio \textit{BEAST} nas frequências de 30 GHz (banda K$_{a}$) e 41 GHz (banda Q) e nas escalas angulares de 0,5° e 0,31°, respectivam
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/04/2002
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17. The microwave background anisotropies: Observations
Most cosmologists now believe that we live in an evolving universe that has been expanding and cooling since its origin about 15 billion years ago. Strong evidence for this standard cosmological model comes from studies of the cosmic microwave background radiation (CMBR), the remnant heat from the initial fireball. The CMBR spectrum is blackbody, as pre
National Academy of Sciences.
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18. Galaxy clustering on large scales.
I describe some recent observations of large-scale structure in the galaxy distribution. The best constraints come from two-dimensional galaxy surveys and studies of angular correlation functions. Results from galaxy redshift surveys are much less precise but are consistent with the angular correlations, provided the distortions in mapping between real-space
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19. Cosmological implications of light element abundances: theory.
Primordial nucleosynthesis provides (with the microwave background radiation) one of the two quantitative experimental tests of the hot Big Bang cosmological model (versus alternative explanations for the observed Hubble expansion). The standard homogeneous-isotropic calculation fits the light element abundances ranging from 1H at 76% and 4He at 24% by mass