搜索结果: 1-13 共查到“天文学 perturbation”相关记录13条 . 查询时间(0.217 秒)
Curvature perturbation from velocity modulation
Curvature perturbation velocity modulation
2011/10/9
We propose a new variant model of the modulated reheating. If particles have large scale fluctuations on their velocities, or equivalently their Lorentz factors, the decay rate also fluctuates and the...
Black hole perturbation in parity violating gravitational theories
Black hole perturbation parity violating gravitational theories
2011/10/14
We study linear perturbations around the static and spherically symmetric spacetime for the gravitational theories whose Lagrangian depends on Ricci scalar and the parity violating Chern-Simons term. ...
Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
waterfall transition black hole constraints non-Gaussianity
2011/10/11
We carried out numerical calculations of a contribution of the waterfall field to the primordial curvature perturbation (on uniform density hypersurfaces) $\zeta$, which is produced during waterfall t...
Feynman-like Rules for Calculating n-Point Correlators of the Primordial Curvature Perturbation
ing n-Point Correlators Primordial Curvature Perturbation
2011/10/10
A diagrammatic approach to calculate n-point correlators of the primordial curvature perturbation \zeta was developed a few years ago following the spirit of the Feynman rules in Quantum Field Theory....
Conformal invariance of curvature perturbation
Conformal invariance curvature perturbation
2011/10/18
We show that in the single component situation all perturbation variables in the comoving gauge are conformally invariant to all perturbation orders. Generally we identify a special time slicing, the ...
Cosmological Perturbation Theory With Background Anisotropic Curvature
Cosmological Perturbation Theory Background Anisotropic Curvature
2011/10/18
The theory of cosmological perturbations is extended to spacetimes displaying isotropic expansion but anisotropic curvature. The perturbed Einstein equation and Boltzmann equations for massless and ma...
A study of relative velocity statistics in Lagrangian perturbation theory with PINOCCHIO
cosmology large-scale structure, methods analytical numerical
2010/11/11
Subject of this paper is a careful and detailed analysis of the PINOCCHIO algorithmfor studying
the relative velocity statistics of merging haloes in Lagrangian perturbation theory. Given
a cosmolog...
Waterfall field in hybrid inflation and curvature perturbation
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/6
We study carefully the contribution of the waterfall field to the curvature perturbation at the end of hybrid inflation. In particular we clarify the parameter dependence analytically under reasonable...
f(T) gravity mimicking dynamical dark energy. Background and perturbation analysis
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc) High Energy Physics - Theory (hep-th)
2010/12/28
We investigate f(T) cosmology in both the background, as well as in the perturbation level, and we present the general formalism for reconstructing the equivalent one-parameter family of f(T) models f...
Perturbation of heliosynchronous orbits in stable Kaluza-Klein theory
heliosynchronous orbits stable Kaluza-Klein theory
2010/3/8
Although the methods and techniques have been greatly improved since the late nineteenth century, the precision on the measurement of the gravitational constant G does not exceed 1 part in 1000. Intri...
The cosmological perturbation theory in loop cosmology with holonomy corrections
cosmological perturbation loop cosmology
2010/3/18
In this paper we investigate the scalar mode of first-order metric perturbations over spatially flat FRW spacetime when the holonomy correction is taken into account in the semi-classical framework of...
THERMAL PROCESSES AND SPIRAL DENSITY WAVES I. RESPONSE OF THE GALACTIC DISC TO A PERTURBATION IN THE GRAVITATIONAL POTENTIAL
THERMAL PROCESSES SPIRAL DENSITY WAVES I THE GALACTIC DISC
2009/4/22
THERMAL PROCESSES AND SPIRAL DENSITY WAVES I. RESPONSE OF THE GALACTIC DISC TO A PERTURBATION IN THE GRAVITATIONAL POTENTIAL。
PERTURBATION THEORY FOR LOW SATELLITES：AN APPLICATION。