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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

ISW effect through dark energy quintessence and ΛCDM models

Rivera Echeverri, José David [UNESP] 21 February 2013 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:25:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-21Bitstream added on 2014-06-13T20:26:58Z : No. of bitstreams: 1 riveraecheverri_jd_me_ift.pdf: 457386 bytes, checksum: 5d639a5ed022bc76e4f1ab784a47e8e7 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Observações atuais do satélite Wilkinson Microwave Anisotropy Probe (WMAP) da Radiação Cósmica de Fundo (CMB) e estruturas de grande escala (LSS) têm permitido melhorar os estudos das anisotropias secundárias, especialmente o efeito Sachs-Wolfe Integrado (ISW). Usando a correlação cruzada entre a CMB e mapas da LSS, o sinal do efeito ISW pode ser detectado. Nós podemos usar o efeito ISW junto com o modelo cosmológico padrão (neste caso o Universo esta dominado pela constante cosmológica e a Matéria Escura Fria, ΛCDM) mais algoritmos numéricos para restringir os parâmetros em um modelo cosmológico com energia escura. Para diferentes casos com um único parâmetro livre de um model de Quintessência parametrizado,' w IND. 0' < 0 e 2,0 < 'w IND. a' <−2,0, podemos encontrar bins de largura [−1,926,−0,323] em 'w ind. 0' e [−0,855, 1,190]. Nestes intervalos, obtemos um sigma de nivel tomando o 68% da amostra que melhor se ajusta ao modelo cosmológico padrão / Current observations of the Wilkinson Microwave Anisotropy Probe (WMAP) satellite of Cosmic Microwave Background (CMB) and Large Scale Structure (LSS) have allowed to improve studies of the secondary anisotropies, especially the Integrated Sachs-Wolfe effect (ISW). Using the cross-correlation between the CMB and LSS maps, the ISW effect signal can be detected. We can use the ISW effect together with standard cosmological model (in this case the Universe is dominated by the cosmological constant and Cold Dark Matter, ΛCDM) plus numerical algorithms to constrain the parameters in a cosmological model with dark energy. For cases different with a single free parameter of a parameterised Quintessence model, 'w ind. 0' < 0 and 2,0 < 'w ind. a' <−2,0, we can find bins of width [−1,926,−0,323] in 'w ind. 0' and [−0,855, 1,190] in wa. In these intervals, we obtain one sigma level by taking the 68% of the sample which best fit the standard cosmological model

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