Scale dependent local non-gaussianity from loops
نویسندگان
چکیده
منابع مشابه
Strongly scale-dependent non-Gaussianity
Cosmological inflation [1] has become the dominant paradigm to understand the initial conditions for the CMB anisotropies and large-scale structure (LSS) formation. This picture has recently received further spectacular confirmation by the Wilkinson Microwave Anisotropy Probe 5 yr set of data [2]. Present and future [3] experiments may be sensitive to the nonlinearities of the cosmological pert...
متن کاملConstraints on local primordial non-Gaussianity from large scale structure
Recent work has shown that the local non-Gaussianity parameter fNL induces a scale dependent bias, whose amplitude is growing with scale. Here we first rederive this result within the context of the peak–background split formalism and show that it only depends on the assumption of universality of the mass function, assuming that the halo bias only depends on the mass. We then use the extended P...
متن کاملScale-dependent bias induced by local non-Gaussianity: A comparison to N-body simulations
We investigate the effect of primordial non-Gaussianity of the local fNL type on the autoand cross-power spectrum of dark matter haloes using simulations of the ΛCDM cosmology. We perform a series of large N-body simulations of both positive and negative fNL, spanning the range between 10 and 100. Theoretical models predict a scale-dependent bias correction ∆b(k, fNL) that depends on the linear...
متن کاملEffects of Scale-Dependent Non-Gaussianity on Cosmological Structures
The detection of primordial non-Gaussianity could provide a powerful means to test various inflationary scenarios. Although scale-invariant non-Gaussianity (often described by the fNL formalism) is currently best constrained by the CMB, single-field models with changing sound speed can have strongly scale-dependent non-Gaussianity. Such models could evade the CMB constraints but still have impo...
متن کاملOptimal Constraints on Local Primordial Non-Gaussianity from the Two-Point Statistics of Large-Scale Structure
One of the main signatures of primordial non-Gaussianity of the local type is a scale-dependent correction to the bias of large-scale structure tracers such as galaxies or clusters, whose amplitude depends on the bias of the tracers itself. The dominant source of noise in the power spectrum of the tracers is caused by sampling variance on large scales (where the non-Gaussian signal is strongest...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2010
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2010/04/024