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Type: Artigo de periódico
Title: Stochastic contribution to the growth factor in the Lambda CDM model
Author: Ribeiro, ALB
Andrade, APA
Letelier, PS
Abstract: We study the effect of noise on the evolution of the growth factor of density perturbations in the context of the Lambda CDM model. Stochasticity is introduced as a Wiener process amplified by an intensity parameter alpha. By comparing the evolution of deterministic and stochastic cases for different values of alpha 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 alpha >= 10(-3).
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.79.027302
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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