搜索结果: 1-15 共查到“天体物理学 PERTURBATIONS”相关记录16条 . 查询时间(0.078 秒)
On Shear-Free perturbations of FLRW Universes
On Shear-Free perturbations of FLRW Universes
2011/10/14
A surprising exact result for the Einstein Field Equations is that if pressure-free matter is moving in a shear-free way, then it must be either expansion-free or rotation-free. It has been suggested ...
Intense ultraviolet perturbations on aquatic primary producers
Intense ultraviolet aquatic primary producers
2011/1/13
During the last decade, the hypothesis that one or more biodiversity drops in the Phanerozoic eon, evident in the geological record, might have been caused by the most powerful kind of stellar explos...
Inflationary Perturbations in Palatini Generalised Gravity
Inflationary Perturbations Palatini Generalised Gravity
2011/1/13
We examine the generation of primordial perturbations during an inflationary epoch in generalised theories of gravity when the equations of motion are derived using the Palatini variational principle...
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...
Perturbations and observational aspects of mutated hilltop inflation
observational aspects mutated hilltop inflation
2011/1/13
We perform a careful investigation of cosmological perturbations and observational aspects, taking mutated hilltop inflation as a representative model. Employing mostly analytical treatment, we derive...
Stability and QuasinormalModes of Black holes in Tensor-Vector-Scalar theory: Scalar Field Perturbations
Stability QuasinormalModes Black holes Tensor-Vector-Scalar theory Scalar Field Perturbations Tensor-Vector-Scalar theory
2010/11/16
The imminent detection of gravitational waves will trigger precision tests of gravity through
observations of quasinormal ringing of black holes. While General Relativity predicts just two po-larizat...
Non-adiabatic perturbations in multi-component perfect fluids
Non-adiabatic perturbations multi-component perfect fluids
2010/11/16
Еvolution of non-adiabatic perturbations in models with multiple coupled perfect fluids with
non-adiabatic sound speed is considered. Instead of splitting the entropy perturbation on relative and int...
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...
Transit timing variations in eccentric hierarchical triple exoplanetary systems. I. Perturbations on the time-scale of the orbital period of the perturber
Earth and Planetary Astrophysics (astro-ph.EP) Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
We study the long-term time-scale (i.e. period comaprable to the orbital period of the outer perturber object) transit timing variations in transiting exoplanetary systems which contain a further, mor...
A Unified Theory for the Effects of Stellar Perturbations and Galactic Tides on Oort Cloud Comets
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/23
We examine the effects of passing field stars on the angular momentum of a nearly radial orbit of an Oort cloud comet bound to the Sun. We derive the probability density function (PDF) of the change i...
The purpose of these lectures is to give a pedagogical introduction to inflation and the production of primordial perturbations, as well as a review of some of the latest developments in this domain. ...
EVOLUTION OF DENSITY PERTURBATIONS IN A CYLINDRICAL MOLECULAR CLOUD USING SMOOTHED PARTICLE HYDRODYNAMICS
ISM: clouds evolution ISM: magnetic fields Stars: formation Methods: numerical
2010/10/29
Molecular clouds have a hierarchical structure from few tens of
parsecs for giants to few tenth of a parsec for proto-stellar cores. Nowadays, our
observational techniques are so advanced that it ha...
Effect of Perturbations in Coriolis and Centrifugal Forces on the Nonlinear Stability of Equilibrium Point in Robe's Restricted Circular Three-Body Problem
Perturbations Centrifugal Forces Coriolis three-body problem
2009/9/4
The effect of perturbations in Coriolis and cetrifugal forces on the nonlinear stability of the equilibrium point of the Robe's (1977) restricted circular three-body problem has been studied when the ...
Perturbations by Mass Loss in the Orbital Elements of Persei and Centauri
Mass Loss Persei Centauri Orbital Elements
2009/6/9
Perturbations by Mass Loss in the Orbital Elements of Persei and Centauri。
SCALE HEIGHTS FOR THE AERONOMICAL MODELS AND PERTURBATIONS OF SATELLITE ORBITS
SCALE HEIGHTS SATELLITE ORBITS THE AERONOMICAL MODELS
2009/4/21
SCALE HEIGHTS FOR THE AERONOMICAL MODELS AND PERTURBATIONS OF SATELLITE ORBITS。