4,342 research outputs found

    Quintessence and Scalar Dark Matter in the Universe

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    Continuing with previous works, we present a cosmological model in which dark matter and dark energy are modeled by scalar fields Φ\Phi and Ψ\Psi, respectively, endowed with the scalar potentials V(Φ)=Vo[cosh(λκoΦ)1]V(\Phi)=V_{o}[ \cosh {(\lambda \sqrt{\kappa_{o}}\Phi)}-1] and V~(Ψ)=Vo~[sinh(ακoΨ)]β\tilde{V}(\Psi)=\tilde{V_{o}}[ \sinh {(\alpha \sqrt{\kappa_{o}}\Psi)}] ^{\beta}. This model contains 95% of scalar field. We obtain that the scalar dark matter mass is mΦ1026eV.m_{\Phi}\sim 10^{-26}eV. The solution obtained allows us to recover the success of the standard CDM. The implications on the formation of structure are reviewed. We obtain that the minimal cutoff radio for this model is rc1.2kpc.r_{c}\sim 1.2 kpc.Comment: 4 pages REVTeX, 3 eps color figures. Minor changes and references updated. To appear in Classical and Quantum Gravity as a Letter to the Editor. More information at http://www.fis.cinvestav.mx/~siddh/PHI

    Levantamento de espécies frutíferas em área de várzea do Município de Parintins - Amazonas.

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    Este trabalho buscou identificar as espécies frutíferas que são encontradas nos quintais florestais em áreas de várzeas e descrever a sua importância e a sua utilização pelos ribeirinhos e agricultores do município de Parintins ? AM

    Substituição do milho por resíduos de biscoitos "Cream Cracker" na alimentação de ovinos.

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