Journal ArticleDOI
Nonlinear Gravitational Growth of Large-Scale Structures Inside and Outside Standard Cosmology
Enrique Gaztanaga,J. A. Lobo +1 more
TLDR
In this article, the authors consider the problem of gravitational structure formation inside and outside general relativity (GR), in both the weakly and strongly nonlinear regime, using the Press-Schechter formalism and its extensions.Abstract:
We reconsider the problem of gravitational structure formation inside and outside general relativity (GR), in both the weakly and strongly nonlinear regime We show how these regimes can be explored observationally through clustering of high-order cumulants and through the epoch of formation, abundance, and clustering of collapse structures, using Press-Schechter formalism and its extensions We address the question of how different these predictions are when using a nonstandard theory of gravity We study examples of cosmologies that do not necessarily obey Einstein's field equations: scalar-tensor theories (STT), such as Brans-Dicke (BD), parametrized with ω, a nonstandard parameterization of the Hubble law, H2 = a-3(1+), or a nonstandard cosmic equation of state p = γρ, where γ can be chosen irrespective of the cosmological parameters (ΩM and ΩΛ) We present some preliminary bounds on γ, ω, and from observations of the skewness and kurtosis in the Automated Plate Measuring (APM) Galaxy Survey This test is independent of the overall normalization of rms fluctuations We also show how abundances and formation times change under these assumptions Upcoming data on nonlinear growth will place strong constraints on such variations from the standard paradigmread more
Citations
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Journal ArticleDOI
Large scale structure of the universe and cosmological perturbation theory
Francis Bernardeau,Stephane Colombi,Enrique Gaztanaga,Enrique Gaztanaga,Roman Scoccimarro,Roman Scoccimarro +5 more
TL;DR: In this article, the authors review the formalism and applications of non-linear perturbation theory (PT) to understand the large-scale structure of the universe, from the linear to the nonlinear regime.
Journal ArticleDOI
Biasing and Hierarchical Statistics in Large-scale Structure
James N. Fry,Enrique Gaztanaga +1 more
TL;DR: In this article, the consequences of an arbitrary, effectively local biasing transformation of a hierarchical underlying matter distribution were considered, and it was shown that a general form of such a transformation preserves the hierarchical properties and the shape of the dispersion in the limit of small fluctuations, i.e. on large scales.
Journal ArticleDOI
Differentiating between modified gravity and dark energy
TL;DR: In this paper, the authors derive the modified gravitational force law necessary to generate any given cosmology, without reference to the fundamental theory, revealing modifications of gravity at scales typically much smaller than today's horizon, and discuss how, through these modifications, the growth of density perturbations, the late-time integrated Sachs-Wolfe effect, and even solar-system measurements may be sensitive to whether today's cosmic acceleration is generated by dark energy or modified gravitational dynamics.
Journal ArticleDOI
Late time acceleration in Brans-Dicke cosmology
Somasri Sen,Ashoke Sen +1 more
TL;DR: In this article, the authors investigated the possibility of having a late time accelerated phase of the universe, suggested by recent supernova observation, in the context of Brans-Dicke theory with a potential having a time dependent mass squared term which has recently become negative and a matter field.
Journal Article
Differentiating between Modified Gravity and Dark Energy
TL;DR: Lue et al. as discussed by the authors showed that the acceleration is not the manifestation of yet another new ingredient in the cosmic gas tank, but rather a signal of our first real lack of understanding of gravitational physics.
References
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Journal ArticleDOI
Formation of Galaxies and Clusters of Galaxies by Self-Similar Gravitational Condensation
Journal ArticleDOI
Merger rates in hierarchical models of galaxy formation
Cedric G. Lacey,Shaun Cole +1 more
TL;DR: In this article, an analytical description of the merging of virialized haloes is presented, which is applicable to any hierarchical model in which structure grows via gravitational instability, and the dependence of the merger rate on halo mass, epoch, the spectrum of initial density fluctuations and the density parameter Ω 0 is explicitly quantified.
Journal ArticleDOI
Excursion set mass functions for hierarchical Gaussian fluctuations
TL;DR: In this paper, the authors proposed a solution based on the theory of the excursion sets of F(r, R sub f), the four-dimensional initial density perturbation field smoothed with a continuous hierarchy of filters of radii.
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