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Type: Artigo de periódico
Title: Stochastic Contribution To The Growth Factor In The Λcdm Model
Author: Ribeiro A.L.B.
Andrade A.P.A.
Letelier P.S.
Abstract: We study the effect of noise on the evolution of the growth factor of density perturbations in the context of the ΛCDM model. Stochasticity is introduced as a Wiener process amplified by an intensity parameter α. By comparing the evolution of deterministic and stochastic cases for different values of α we estimate the intensity level necessary to make noise relevant for cosmological tests based on large-scale structure data. Our results indicate that the presence of random forces underlying the fluid description can lead to significant deviations from the nonstochastic solution at late times for α≥10-3. © 2009 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.79.027302
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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