Non-gaussian microwave background fluctuations from nonlinear gravitational effects
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Non-gaussian microwave background fluctuations from nonlinear gravitational effects

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Published by Fermi National Accelerator Laboratory, National Aeronautics and Space Administration, National Technical Information Service, distributor in [Batavia, Ill.], [Washington, D.C, [Springfield, Va .
Written in English

Subjects:

  • Cosmic background radiation.,
  • Fluctuations (Physics)

Book details:

Edition Notes

StatementD.S. Salopek.
SeriesNASA contractor report -- NASA CR-188699., FERMILAB-Pub -- 91/161-A., Fermilab pub -- 91/161-A.
ContributionsFermi National Accelerator Laboratory., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15390660M

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Weak gravitational lensing has several important effects on the cosmic microwave background (CMB): it changes the CMB power spectra, induces non-Gaussianities, and generates a B-mode polarization. We describe some simple geometric properties of microwave background temperature anisotropies whose expectation values can be derived in cases where the random field of temperature fluctuations is not necessarily a gaussian random field. We explain how these properties may be useful for discriminating between gaussian and non-gaussian : P. Coles.   Analysis of non-Gaussian cosmic microwave background maps based on the N-pdf. for the relation between the temperature fluctuations and the gravitational potential at the Sachs–Wolfe regime. Let us remark that, of course, this model do not pretend to incorporate all the gravitational (like lensing) and non-gravitational effects, due to Cited by: A Semi-Parametric Approach to the Detection of Non-Gaussian Gravitational Wave Stochastic Backgrounds Lionel Martellini1,2, and Tania Regimbau2 1EDHEC-Risk Institute, Promenade des Anglais, BP , Nice Cedex 3, France resulting in the formation of a non-Gaussian background. It has also been shown that the background from cosmic.

@article{osti_, title = {Will COBE challenge the inflationary paradigm - Cosmic microwave background anisotropies versus large-scale streaming motions revisited}, author = {Gorski, K M}, abstractNote = {The relation between cosmic microwave background (CMB) anisotropies and large-scale galaxy streaming motions is examined within the framework of inflationary cosmology. Non‐gaussianity Versus Nonlinearity of Cosmological Perturbations Article in Annals of the New York Academy of Sciences (1) - 69 June with 36 Reads How we measure 'reads'Author: Licia Verde. The presence of non--Gaussian features in the Cosmic Microwave Background (CMB) radiation maps represents one of the most long--awaited clues in the search for. The cosmic microwave background radiation is an emission of uniform, black body thermal energy coming from all parts of the sky. The radiation is isotropic to roughly one part in , the root mean square variations are only 18 µK, after subtracting out a dipole anisotropy from the Doppler shift of the background radiation. The latter is caused by the peculiar velocity of the Sun relative.

Non-Gaussian Microwave Background Fluctuations from Nonlinear Gravitational Effects Symmetry Operators for Maxwell's Equations on Curved Space-Time Separation of Variables and Constants of Motion for Relativistic Wave Equations on Curved Space-Time. IMPROVED SIMULATION OF NON-GAUSSIAN TEMPERATURE AND POLARIZATION COSMIC MICROWAVE BACKGROUND MAPS Franz Elsner1 and Benjamin D. Wandelt2,3 4 1 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Straße 1, D . First let us discuss the temperature power spectrum. The temperature multipole moments due to an individual gravitational wave of wavenumber k observed at a conformal time τ 0 are (27) Δ Tl = (l + 2)! (l-2)! ∫ 0 τ 0 d τ-h ˙ e-κ + g Ψ j l (x) x 2, with x = k (τ 0 −τ).The second of the sourcing terms is localised to the surface of last scattering (SLS) by the visibility function; as Cited by: @article{osti_, title = {PHYSICS OF NON-GAUSSIAN FIELDS AND THE COSMOLOGICAL GENUS STATISTIC}, author = {James, J. Berian, E-mail: [email protected]}, abstractNote = {We report a technique to calculate the impact of distinct physical processes inducing non-Gaussianity on the cosmological density field. A natural decomposition of the cosmic genus statistic into an orthogonal.