Signatures of initial state modifications on bispectrum statistics
نویسندگان
چکیده
منابع مشابه
Signatures of Initial State Modifications on Bispectrum Statistics
Modifications of the initial-state of the inflaton field can induce a departure from Gaussianity and leave a testable imprint on the higher order correlations of the CMB and large scale structures in the Universe. We focus on the bispectrum statistics of the primordial curvature perturbation and its projection on the CMB. For a canonical singlefield action the three-point correlator enhancement...
متن کاملPosition-dependent power spectrum - a new statistics for bispectrum
The bispectrum of galaxies is a powerful probe of the non-linear gravitational evolution and galaxy formation. Non-linear evolution and non-linear galaxy biasing yield a non-vanishing bispectrum even in the absence of primordial nonGaussianity. Despite its promise, measurements of the bispectrum have been a challenge due to complicated window function effects and the covariance matrix. Here, we...
متن کاملInitial Semantics for Strengthened Signatures
We give a new general definition of arity, yielding the companion notions of signature and associated syntax. This setting is modular in the sense requested by [12]: merging two extensions of syntax corresponds to building an amalgamated sum. These signatures are too general in the sense that we are not able to prove the existence of an associated syntax in this general context. So we have to s...
متن کاملCompleteness of the Bispectrum on Compact Groups
This paper derives completeness properties of the bispectrum for compact groups and their homogeneous spaces. The bispectrum is the Fourier transform of the triple correlation, just as the magnitude-squared spectrum is the Fourier transform of the autocorrelation. The bispectrum has been applied in time series analysis to measure non-Gaussianity and non-linearity. It has also been applied to pr...
متن کاملOn the bispectrum of COBE and WMAP
The COBE-DMR 4-year maps displayed a strong non-Gaussian signal in the “interscale” components of the bispectrum: their observed values did not display the scatter expected from Gaussian maps. We re-examine this and other suggested non-Gaussian features in the light of WMAP. We find that they all disappear. Given that it was proved that COBE-DMR high noise levels and documented systematics coul...
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: 2009
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2009/05/018