搜索结果: 1-12 共查到“理学 non-Gaussianities”相关记录12条 . 查询时间(0.078 秒)
Inflationary non-Gaussianities in the most general second-order scalar-tensor theories
Inflationary non-Gaussianities in the most general second-order scalar-tensor theories
2011/10/14
For very general scalar-field theories in which the equations of motion are at second-order, we evaluate the three-point correlation function of primordial scalar perturbations generated during inflat...
I review what bispectra and trispectra look like in real space, in terms of the sign of particular shaped triangles and tetrahedrons. Having an equilateral density bispectrum of positive sign correspo...
Inflation and primordial non-Gaussianities of "generalized Galileons"
Inflation primordial non-Gaussianities
2011/10/9
We set up cosmological perturbation theory and study the cosmological implications of the so-called `generalized Galileon' developed in \cite{Deffayet:2011gz,horndeski}.This is the most general scalar...
A weak lensing view on primordial non-Gaussianities
cosmology: large-scale structure gravitational lensing methods: analytical
2011/9/29
We investigate the signature of primordial non-Gaussianities in the weak lensing bispectrum, in particular the signals generated by local, orthogonal and equilateral non-Gaussianities. The questions w...
CMB Bispectrum from Primordial Scalar, Vector and Tensor non-Gaussianities
CMB Bispectrum Primordial Scalar Vector Tensor non-Gaussianities
2011/3/2
We present an all-sky formalism for the CMB bispectrum induced by the primordial non-Gaussianities not only in scalar but also in vector and tensor fluctuations. We find that the bispectrum can be for...
Curvature Perturbations and non-Gaussianities from Waterfall Phase Transition during Inflation
Curvature Perturbations non-Gaussianities
2011/1/13
We consider a variant of hybrid inflation where the waterfall phase transition happens during inflation. By adjusting the parameters associated with the mass of the waterfall field, we arrange that t...
Non-gaussianities and the Stimulated creation of quanta in the inflationary universe
Non-gaussianities the Stimulated creation
2011/1/11
Cosmological inflation generates a spectrum of density perturbations that can seed the cosmic structures we observe today. These perturbations are usually computed as the result of the gravitationally...
Non-Gaussianities in Multifield Inflation: Superhorizon Evolution, Adiabaticity, and the Fate of fnl
Multifield Inflation Superhorizon Evolution
2010/12/27
We explore the superhorizon generation of large fnl of the local form in two field inflation. We calculate the two- and three-point observables in a general class of potentials which allow for an ana...
Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
Entropic Cosmology Primordial Perturbations non-Gaussianities
2010/12/23
We investigate thermal inflation in double-screen entropic cosmology. We find that its realization is general, resulting from the system evolution from non-equilibrium to equilibrium. Furthermore, goi...
Non-Gaussianities in Multifield Inflation: Superhorizon Evolution, Adiabaticity, and the Fate of fnl
Non-Gaussianities in Multifield Inflation Superhorizon Evolution Adiabaticity Fate of fnl
2010/12/21
We explore the superhorizon generation of large fNL of the local form in two eld in
ation.We calculate the two- and three-point observables in a general class of potentials which allow for an analyt...
Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
Inflation Primordial Perturbations non-Gaussianities
2010/11/16
We investigate thermal inflation in double-screen entropic cosmology. We find that its realization is general, resulting from the system evolution from non-equilibrium to equilibrium. Furthermore,goin...
Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
Inflation in Entropic Cosmology Primordial Perturbations non-Gaussianities
2010/12/21
We investigate thermal inflation in double-screen entropic cosmology. We find that its realization is general, resulting from the system evolution from non-equilibrium to equilibrium. Furthermore,goin...