Results 11 to 20 of about 22,410,258 (325)
Primordial non-Gaussianity and non-Gaussian covariance [PDF]
Physical Review D, 2022 In the pursuit of primordial non-Gaussianities, we hope to access smaller scales across larger comoving volumes. At low redshift, the search for primordial non-Gaussianities is hindered by gravitational collapse, to which we often associate a scale $k_ ...
T. Flöss, M. Biagetti, P. Meerburg
semanticscholar +4 more sources
Non-gaussianity after BICEP2 [PDF]
Physical Review Letters, 2014 We analyze primordial non-Gaussianity in single-field inflationary models when the tensor-to-scalar ratio is large. Our results show that detectable levels of non-Gaussianity fNL∼50 are still possible in the simplest class of models described by the ...
D'Amico, Guido, Kleban, Matthew
core +6 more sources
Review of Local Non-Gaussianity from Multifield Inflation [PDF]
Advances in Astronomy, 2010 We review models which generate a large non-Gaussianity of the local form. We first briefly consider three models which generate the non-Gaussianity either at or after the end of inflation; the curvaton scenario, modulated (p)reheating, and an ...
Christian T. Byrnes, Ki-Young Choi
doaj +2 more sources
Non-Gaussianity from preheating [PDF]
Physical Review Letters, 2005 We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local ...
Multamaki, Tuomas +4 more
core +7 more sources
Non-Gaussianity as a particle detector [PDF]
Journal of High Energy Physics, 2016 We study the imprints of massive particles with spin on cosmological correlators. Using the framework of the effective field theory of inflation, we classify the couplings of these particles to the Goldstone boson of broken time translations and the ...
Hayden Lee, D. Baumann, G. L. Pimentel
semanticscholar +6 more sources
Tests for Primordial Non-Gaussianity [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We investigate the relative sensitivities of several tests for deviations from Gaussianity in the primordial distribution of density perturbations. We consider models for non-Gaussianity that mimic that which comes from inflation as well as that which ...
MATARRESE, SABINO +3 more
core +5 more sources
Non-Gaussianity from Inflation [PDF]
Physical Review D, 2002 Correlated adiabatic and isocurvature perturbation modes are produced during inflation through an oscillation mechanism when extra scalar degrees of freedom, other than the inflaton field, are present.
MATARRESE, SABINO +2 more
core +3 more sources
Persistent homology and non-Gaussianity [PDF]
Journal of Cosmology and Astroparticle Physics, 2017 In this paper, we introduce the topological persistence diagram as a statistic for Cosmic Microwave Background (CMB) temperature anisotropy maps. A central concept in 'Topological Data Analysis' (TDA), the idea of persistence is to represent a data set ...
A. Cole, G. Shiu
semanticscholar +4 more sources
Number counts and non-Gaussianity [PDF]
Physical Review D, 2013 We describe a general procedure for using number counts of any object to constrain the probability distribution of the primordial fluctuations, allowing for generic weak non-Gaussianity.
Scott, P. +7 more
core +6 more sources
Peaks and primordial black holes: the effect of non-Gaussianity [PDF]
Journal of Cosmology and Astroparticle Physics, 2022 In light of recent developments in the field, we re-evaluate the effect of local-type non-Gaussianity on the primordial black hole (PBH) abundance (and consequently, upon constraints on the primordial power spectrum arising from PBHs).
S. Young
semanticscholar +1 more source