搜索结果: 76-90 共查到“天文学 Universe”相关记录142条 . 查询时间(0.016 秒)
The dark matter assembly of the Local Group in constrained cosmological simulations of a LambdaCDM universe
galaxies:haloes cosmology:theory methods
2011/8/24
We make detailed theoretical predictions for the assembly properties of the Local Group (LG) in the standard LambdaCDM cosmological model. We use three cosmological N-body dark matter simulations from...
By assuming that a dark component (dark energy) in the universe strictly obeys the holographic principle, that is, its entropy is one fourth of the apparent horizon, we find that the existence of the...
The cosmological constant and the relaxed universe
The cosmological constant the relaxed universe
2011/1/13
We study the role of the cosmological constant (CC) as a component of dark energy (DE). It is argued that the cosmological term is in general unavoidable and it should not be ignored even when dynami...
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...
We examine Milky Way-Magellanic Cloud systems selected from the Millennium-II Simulation in order to place the orbits of the Magellanic Clouds in a cosmological context. Our analysis shows that satell...
On A Cosmological Invariant as an Observational Probe in the Early Universe
Cosmological Invariant Observational Probe
2011/1/11
k-essence scalar field models are usually taken to have lagrangians of the form ${\mathcal L}=-V(\phi)F(X)$ with $F$ some general function of $X=\nabla_{\mu}\phi\nabla^{\mu}\phi$. Under certain condit...
Circular patterns within the cosmic microwave background suggest that space and time did not come into being at the Big Bang but that our universe in fact continually cycles through a series of "aeons...
Genesis and evolution of dust in galaxies in the early Universe I. Modeling dust evolution in starburst galaxies
galaxies high-redshift – galaxies starburst – galaxies evolution – ISM evolution – quasars general – stars massive
2010/11/16
Aims. The aim is to elucidate the astrophysical conditions required for generating large amounts of dust in massive starburst galaxies at high redshift.
The influence of inhomogeneities on the large-scale expansion of the universe
influence of inhomogeneities large-scale expansion of the universe
2010/11/12
The evolution of an inhomogeneous universe composed entirely of matter is followed from an early, nearly uniform state until the time when the inhomogeneities have begun to grow large. The particular ...
The Distribution of Coalescing Compact Binaries in the Local Universe: Prospects for Gravitational-Wave Observations
gravitational waves — stars neutron — binaries general
2010/11/11
Merging compact binaries are the most viable and best studied candidates for gravitational wave
(GW) detection by the fully operational network of ground-based observatories. In anticipation of the f...
The high-redshift Universe with the International X-ray Observatory
Galaxies active – X-rays Active Galactic Nuclei – galaxies high-redshift
2010/11/10
We discuss some of the main open issues related to the light–up and evolution of the first accreting sources powering high redshift luminous quasars.We discuss the perspectives of future deep X–ray su...
Modelling the dusty universe II: The clustering of submillimetre-selected galaxies
galaxies:high-redshift – galaxies-evolution – cosmology large scale struc-ture – submillimetre – methods N-body simulations
2010/11/12
We combine the galform semi-analytical model of galaxy formation, which predicts the star formation and merger histories of galaxies, the grasil spectro-photometric code, which calculates the spectral...
Galaxies and the Local Universe with WFXT
X-ray galaxies – galaxies spiral – galaxies general – galaxies ISM
2010/11/15
Galaxies are essential building blocks in the Universe. However they are faint and complex X-ray sources and require high performance instrumentation to be properly studied. Yet they are fundamental f...
Testing gravity using the growth of large scale structure in the Universe
Methods numerical — Cosmology theory — dark energy
2010/11/15
Future galaxy surveys hope to distinguish between the dark energy and modified gravity
scenarios for the accelerating expansion of the Universe using the distortion of clustering in
redshift space. ...
The Origin of Dust in the Early Universe: Probing the Star Formation History of Galaxies by their Dust Content
galaxies evolution high-redshift starburst - quasars individ-ual
2010/11/11
Two distinct scenarios for the origin of the ∼ 4 × 108 M⊙ of dust observed in the high-redshift (z = 6.4) quasar J1148+5251 have been proposed. The first assumes that this galaxy is much younger...