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Modification from Noncommutative Inflation
Hong-Guang Zhang, Jie Ren, Xin-He Meng
We explore the noncommutative effect on single field inflation and compare with WMAP five-year data. First, we calculate the noncommutative effect from the potential and dynamical…
Exact solutions of embedding the 4D Universe in a 5D Einstein manifold
Xin-He Meng, Jie Ren, Hong-Guang Zhang
One of the simplest way to extend 4D cosmological models is to add another spatial dimension to make them 5D. In particular, it has been shown that the simplest of such 5D models,…
Exploring trans-Planckian physics and the curvature effect by primordial power spectrum with WMAP five-year data
Jie Ren, Hong-Guang Zhang, Xin-He Meng
The vacuum inflation with a boundary condition specified at a short-distance scale in a generally primeval non-flat Universe, and implications of the correspondingly modified primo…
Tachyon field inspired dark energy and supernovae constraints
Jie Ren, Xin-He Meng
The tachyon field in cosmology is studied by applying the generating function method to obtain exact solutions. The equation of state parameter of the tachyon field is $w=-1+ε\dot{…
Analysis to the entangled states from an extended Chaplygin gas model
Xin He Meng, Ming Guang Hu, Jie Ren
With considerations of the recently released WMAP year three and supernova legacy survey (SNLS) data set analysis that favors models similar to the model by possibly mild…
Dark viscous fluid described by a unified equation of state in cosmology
Jie Ren, Xin-He Meng
We generalize the CDM model by introducing a unified EOS to describe the Universe contents modeled as dark viscous fluid, motivated by the fact that a single constant equation o…
Modified equation of state, scalar field, and bulk viscosity in Friedmann universe
J. Ren, X. H. Meng
A generalized dynamical equation for the scale factor of the universe is proposed to describe the cosmological evolution, of which the CDM model is a special case. It also provi…
Cosmology with extended Chaplygin gas media and crossing
Xin-He Meng, Ming-Guang Hu, Jie Ren
In this paper the accelerating expansion of our universe at the late cosmic evolution time in a generally modified (extended) \emph{Chaplygin gas} (Dark Fluid) model is detailed, w…