Results 21 to 30 of about 22,410,258 (325)
Shapes of non-Gaussianity in warm inflation [PDF]
Journal of Cosmology and Astroparticle Physics, 2022 Sphaleron heating has been recently proposed as a mechanism to realize warm inflation when inflaton is an axion coupled to pure Yang-Mills. As a result of heating, there is a friction coefficient γ ∝ T 3 in the equation of motion for the inflaton, and a ...
Mehrdad Mirbabayi, A. Gruzinov
semanticscholar +1 more source
Non-linear isocurvature perturbations and non-Gaussianities [PDF]
, 2008 24 pagesWe study non-linear primordial adiabatic and isocurvature perturbations and their non-Gaussianity. After giving a general formulation in the context of an extended $\delta N$ formalism, we analyse in detail two illustrative examples. The first is
Vernizzi, F. +4 more
core +7 more sources
Quantum non-Gaussianity of light and atoms [PDF]
Progress in Quantum Electronics, 2022 Quantum non-Gaussian states of photons and phonons are conclusive and direct witnesses of higher-than-quadratic nonlinearities in optical and mechanical processes.
L. Lachman, R. Filip
semanticscholar +1 more source
Reduced non-Gaussianity by 30 s rapid update in convective-scale numerical weather prediction [PDF]
Nonlinear Processes in Geophysics, 2021 Non-Gaussian forecast error is a challenge for ensemble-based data assimilation (DA), particularly for more nonlinear convective dynamics. In this study, we investigate the degree of the non-Gaussianity of forecast error distributions at 1 km resolution ...
J. Ruiz +11 more
doaj +1 more source
Nihon Kikai Gakkai ronbunshu, 2022 We consider a linear system under non-Gaussian random excitation modeled by the Cai and Lin’s model and investigate the effects of the non-Gaussianity of the excitation on the displacement and velocity responses based on the bispectrum and cross ...
Daizoh ITOH, Takahiro TSUCHIDA
doaj +1 more source
Journal of Cosmology and Astroparticle Physics, 2009 We study non-Gaussianity induced by a pseudo Nambu-Goldstone boson with a cosine-type scalar potential. We focus on how the non-Gaussianity is affected when the pseudo Nambu-Goldstone boson rolls down from near the top of the scalar potential where the deviation from a quadratic potential is large.
Kawasaki, Masahiro +2 more
openaire +2 more sources
Resonant non-gaussianity [PDF]
Journal of Cosmology and Astroparticle Physics, 2011 32 pages, 4 ...
Flauger, Raphael, Pajer, Enrico
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Diagnosing non-Gaussianity of forecast and analysis errors in a convective-scale model [PDF]
Nonlinear Processes in Geophysics, 2016 In numerical weather prediction, the problem of estimating initial conditions with a variational approach is usually based on a Bayesian framework associated with a Gaussianity assumption of the probability density functions of both observations and ...
R. Legrand, Y. Michel, T. Montmerle
doaj +1 more source
Resource theory of quantum non-Gaussianity and Wigner negativity [PDF]
Physical Review A, 2018 We develop a resource theory for continuous-variable systems grounded on operations routinely available within current quantum technologies. In particular, the set of free operations is convex and includes quadratic transformations and conditional coarse-
F. Albarelli +3 more
semanticscholar +1 more source
Inhomogeneous non-gaussianity [PDF]
Journal of Cosmology and Astroparticle Physics, 2012 We propose a method to probe higher-order correlators of the primordial density field through the inhomogeneity of local non-Gaussian parameters, such as f_NL, measured within smaller patches of the sky. Correlators between n-point functions measured in one patch of the sky and k-point functions measured in another patch depend upon the (n+k)-point ...
Byrnes, Christian T. +3 more
openaire +4 more sources