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Simulations of Galileon modi ed gravity clustering statistics in real and redshift space

Mark Wyman Elise Jennings; Marcos Vinicius Borges Teixeira Lima

São Paulo 2013

Acesso online

  • Título:
    Simulations of Galileon modi ed gravity clustering statistics in real and redshift space
  • Autor: Mark Wyman
  • Elise Jennings; Marcos Vinicius Borges Teixeira Lima
  • Assuntos: COSMOLOGIA; GRAVIDADE; RELATIVIDADE (FÍSICA)
  • Notas: arXiv.1303.6630
  • Descrição: We use N-body simulations to study the statistics of massive halos and redshift space distortions for theories with a standard CDM expansion history and a galileon-type scalar eld. The extra scalar eld increases the gravitational force, leading to enhanced structure formation. We compare our measurements of the real space matter power spectrum and halo properties with tting formula for estimating these quantities analytically. We nd that a model for power spectrum, halo mass function and halo bias, derived from CDM simulations can t the results from our simulations of modi ed gravity when 8 is appropriately adjusted. We also study the redshift space distortions in the two point correlation function measured from these simulations, nding a di erence in the ratio of the redshift space to real space clustering amplitude relative to standard gravity on all scales. We nd enhanced clustering on scales r > 10 Mpc=h and increased damping of the correlation function for scales r < 9 Mpc=h. The boost in the clustering on large scales due to the enhanced gravitational forces cannot be mimicked in a standard gravity model by simply changing 8. This result illustrates the usefulness of redshift space distortion measurements as a probe of modi cations to General Relativity.
  • Editor: São Paulo
  • Data de criação/publicação: 2013
  • Formato: 17 p..
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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