搜索结果: 1-15 共查到“知识库 dark energy”相关记录82条 . 查询时间(0.143 秒)
Explaining Holographic Dark Energy
dark energy holographic principle holographic dark energy UV/IR connection bulk holography spacetime foam quantum fluctuations of spacetime
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2016/6/13
The possible holographic origin of dark energy is investigated. The main existing explanations, namely the UV/IR connection argument of Cohen et al, Thomas' bulk holography argument, and Ng's spacetim...
Explaining Holographic Dark Energy
holographic dark energy event horizon quantum fluctuations of spacetime UV/IR connection bulk holography spacetime foam
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2016/5/30
The physical origin of holographic dark energy (HDE) is investigated. The main existing explanations, namely the UV/IR connection argument of Cohen et al, Thomas' bulk holography argument, and Ng's sp...
Solvable K-essence Cosmologies and Modified Chaplygin Gas Unified Models of Dark Energy and Dark Matter
Solvable K-essence Cosmologies Modified Chaplygin Gas Unified Models of Dark Energy Dark Matter
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2012/4/20
This paper is devoted to the investigation of modified Chaplygin gas model in the context of solvable k-essence cosmologies. For this purpose, we construct equations of state parameter of this model f...
Variable $G$ Correction for Dark Energy Model in Higher Dimensional Cosmology
Variable $G$ Correction Dark Energy Model Higher Dimensional Cosmology General Physics
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2012/4/19
In this work, we have considered $N (=4+d)$-dimensional Einstein field equations in which 4-dimensional space-time which is described by a FRW metric and that of the extra $d$-dimensions by an Euclide...
Holographic Dark Energy Characterized by the Total Comoving Horizon and Insights to Cosmological Constant and Coincidence Problem
Holographic Dark Energy the Total Comoving Horizon Insights Cosmological Constant Coincidence Problem
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2012/2/21
The observed acceleration of the present universe is shown to be well explained by the holographic dark energy characterized by the total comoving horizon of the universe ($\eta$HDE). It is of interes...
Equation of State for Dark Energy in Modified Gravity Theories
Modified theories of gravity Dark energy Cosmology
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2012/2/21
We explore the equation of state (EoS) for dark energy $w_{\mathrm{DE}}$ in modified gravitational theories to explain the current accelerated expansion of the universe. We explicitly demonstrate that...
Probing dark energy beyond $z=2$ with CODEX
Probing dark energy CODEX cosmological redshift
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2012/2/21
Precision measurements of nature's fundamental couplings and a first measurement of the cosmological redshift drift are two of the key targets for future high-resolution ultra-stable spectrographs suc...
Dark Energy and Fate of the Universe
Dark Energy Fate Universe negative redshifts
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2012/2/21
We explore the ultimate fate of the Universe by using a divergence-free parametrization for dark energy $w(z)=w_0+w_a({\ln (2+z)\over 1+z}-\ln2)$. Unlike the CPL parametrization, this parametrization ...
Constraining dynamical dark energy with a divergence-free parametrization in the presence of spatial curvature and massive neutrinos
Constraining dynamical dark energy divergence-free parametrization presence spatial curvature massive neutrinos
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2012/2/21
In this paper, we report the results of constraining the dynamical dark energy with a divergence-free parameterization, $w(z) = w_{0} + w_{a}(\frac{\ln(2+z)}{1+z}-\ln2)$, in the presence of spatial cu...
Magnetized dark energy and the late time acceleration
Magnetized dark energy the late time acceleration
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2012/4/19
In the present work we have searched the existence of the late time acceleration of the Universe. The matter source that is responsible for the late time acceleration of the Universe consists of cosmi...
Dark goo: Bulk viscosity as an alternative to dark energy
dark energy theory cosmological perturbation theory
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2011/9/29
We present a simple (microscopic) model in which bulk viscosity plays a role in explaining the present acceleration of the universe. The effect of bulk viscosity on the Friedmann equations is to turn ...
Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas
interaction modifi ed Ricci’s cutoff dark energy dark matter relaxed Chaplygin gas
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2011/10/13
We investigate a model of interacting dark matter and dark energy given by a modified holographic Ricci's cutoff in a spatially flat Friedmann-Robertson-Walker (FRW) space-time. We consider a non line...
The WiggleZ Dark Energy Survey: constraining the evolution of Newton's constant using the growth rate of structure
constraining evolution constant using growth rate structure
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2011/10/11
We constrain the evolution of Newton's constant using the growth rate of large-scale structure measured by the WiggleZ Dark Energy Survey in the redshift range $0.1 < z < 0.9$. We use this data in two...
Power-law entropy corrected new holographic scalar field models of dark energy
Power-law holographic scalar field models dark energy PLECHDE model
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2011/8/11
Abstract: In this work, the PLECHDE model with Granda-Oliveros infrared cutoff is studied and the evolution of dark energy density, deceleration and EoS parameters are calculated. I demonstrate that u...
Early massive clusters and the bouncing coupled dark energy
dark energy – dark matter – cosmology: theory – galaxies: formation –methods:N-body simulations
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2011/10/21
The abundance of the most massive objects in the Universe at different epochs is a very sensitive probe of the cosmic background evolution and of the growth history of density perturbations, and could...