A Model Of Inflationary Cosmology Without Singularity (2008)
Cai, Yi-Fu, Qiu, Tao-tao, Xia, Jun-Qing, Zhang, Xinmin
In this letter, we propose a model of inflationary cosmology with a bounce preceded and study its primordial curvature perturbations. Our model gives rise to a primordial power spectrum with a...
Determining Cosmological Parameters with Latest Observational Data (2008)
Xia, Jun-Qing, Li, Hong, Zhao, Gong-Bo, Zhang, Xinmin
In this paper, we combine the latest observational data, including the WMAP five-year data (WMAP5), BOOMERanG, CBI, VSA, ACBAR, as well as the Baryon Acoustic Oscillations (BAO) and Type Ia...
Probing for cosmological parameters with LAMOST measurement (2008)
Li, Hong, Xia, Jun-Qing, Fan, Zuhui, Zhang, Xinmin
In this paper we study the sensitivity of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) project to the determination of cosmological parameters, employing the Monte Carlo...
Li, Hong, Xia, Jun-Qing, Zhao, Gong-Bo, Fan, Zu-Hui, Zhang, Xinmin
Recently, the WMAP group has published their five-year data and considered the constraints on the time evolving equation of state of dark energy for the first time from the WMAP distance information....
Testing CPT Symmetry with CMB Measurements: Update after WMAP5 (2008)
Xia, Jun-Qing, Li, Hong, Zhao, Gong-Bo, Zhang, Xinmin
In this Letter we update our previous result on the test of CPT symmetry with Cosmic Microwave Background (CMB) measurements. A CPT violating interaction in the photon sector ${\cal L}_{cs} \sim...
Constraining Slow-Roll Inflation in the Presence of Dynamical Dark Energy (2007)
In this paper we perform a global analysis of the constraints on the inflationary parameters in the presence of dynamical dark energy models from the current observations, including the three-year...
Overcoming the Circular Problem for \gamma-ray Bursts in Cosmological Global Fitting Analysis (2007)
Li, Hong, Xia, Jun-Qing, Liu, Jie, Zhao, Gong-Bo, Fan, Zu-Hui, Zhang, Xinmin
Due to the lack of low redshift long Gamma-Ray Bursts (GRBs), the circular problem has been a severe obstacle for using GRBs as cosmological candles. In this paper, we present a new method to deal...
Testing CPT Symmetry with CMB Measurements (2007)
Xia, Jun-Qing, Li, Hong, Wang, Xiulian, Zhang, Xinmin
In this paper we study the possibility of testing \emph{CPT} symmetry with Cosmic Microwave Background (CMB) measurements. Working with an effective lagrangian of the photon with \emph{CPT} violation...
Probing for the Cosmological Parameters with PLANCK Measurement (2007)
Xia, Jun-Qing, Li, Hong, Zhao, Gong-Bo, Zhang, Xinmin
We investigate the constraints on cosmological parameters especially for EoS of dark energy, inflationary parameters, neutrino mass and curvature of universe using simulated Planck data. Firstly we...
Constraints on the Sound Speed of Dynamical Dark Energy (2007)
Xia, Jun-Qing, Cai, Yi-Fu, Qiu, Tao-Tao, Zhao, Gong-Bo, Zhang, Xinmin
In this paper we study the sound speed - $c_s^2$, which is directly related to the classical perturbations - of the dynamical dark energy (DE), especially with an equation of state crossing the...
Zhao, Gong-Bo, Xia, Jun-Qing, Li, Hong, Tao, Charling, Virey, Jean-Marc, Zhu, Zong-Hong, ...
We use the newly released 182 Type Ia supernova data combined with the third-year Wilkinson Microwave Anisotropic Probe data (WMAP3) and large scale structure (LSS) information including SDSS and...
Cosmological CPT Violation, Baryon/Leptogenesis and CMB Polarization (2006)
Li, Mingzhe, Xia, Jun-Qing, Li, Hong, Zhang, Xinmin
In this paper we study the cosmological CPT-violation and its implications in baryo/leptogenesis and CMB polarization. We propose specifically a variant of the models of gravitational leptogenesis....
Probing for variation of neutrino mass with current observations (2006)
Zhao, Gong-Bo, Xia, Jun-Qing, Zhang, Xinmin
With the latest astronomical data including Cosmic Microwave Background (WMAP three year, CBI, ACBAR, VSA), Type Ia Supernova ("gold sample"), Galaxy Clustering (SDSS 3-D matter power, Lyman-$\alpha$...
Cosmological neutrino mass limit and the dynamics of dark energy (2006)
Xia, Jun-Qing, Zhao, Gong-Bo, Zhang, Xinmin
We investigate the correlation between the neutrino mass limit and dark energy with time evolving equation of state. Parameterizing dark energy as w=w_0+w_1*z/(1+z), we make a global fit using Markov...
Feng, Bo, Xia, Jun-Qing, Yokoyama, Jun'ichi
We probe the scale dependence of the primordial spectrum in the light of the three-year WMAP (WMAP3) alone and WMAP3 in combination with the other cosmological observations such as galaxy clustering...
Weighing neutrinos in the presence of a running primordial spectral index (2006)
Feng, Bo, Xia, Jun-Qing, Yokoyama, Jun'ichi, Zhang, Xinmin, Zhao, Gong-Bo
The three-year WMAP(WMAP3), combined with other cosmological observations from galaxy clustering and Type Ia Supernova (SNIa), prefers a non-vanishing running of the primordial spectral index...
Features in Dark Energy Equation of State and Modulations in the Hubble Diagram (2006)
Xia, Jun-Qing, Zhao, Gong-Bo, Li, Hong, Feng, Bo, Zhang, Xinmin
We probe the time dependence of the dark energy equation of state (EOS) in light of three-year WMAP (WMAP3) and the combination with other tentative cosmological observations from galaxy clustering...
Zhao, Gong-Bo, Xia, Jun-Qing, Feng, Bo, Zhang, Xinmin
Using the Markov chain Monte Carlo (MCMC) method we perform a global analysis constraining the dynamics of dark energy in light of the supernova (Riess "Gold" samples), galaxy clustering (SDSS 3D...
Probing Inflation and Dark Energy with Current Cosmological Observations (2006)
Xia, Jun-Qing, Zhao, Gong-Bo, Feng, Bo, Zhang, Xinmin
It is commonly believed that our Universe has experienced two different stages of accelerated expansion. The early stage is known as inflation and the current acceleration is driven by dark energy....
Searching for CPT Violation with Cosmic Microwave Background Data from WMAP and BOOMERANG (2006)
Feng, Bo, Li, Mingzhe, Xia, Jun-Qing, Chen, Xuelei, Zhang, Xinmin
We search for signatures of Lorentz and $CPT$ violations in the cosmic microwave background (CMB) temperature and polarization anisotropies by using the WMAP and the 2003 flight of BOOMERANG (B03)...
Observing Dark Energy Dynamics with Supernova, Microwave Background and Galaxy Clustering (2005)
Xia, Jun-Qing, Zhao, Gong-Bo, Feng, Bo, Li, Hong, Zhang, Xinmin
Observing dark energy dynamics is the most important aspect of the dark energy research. In this paper we perform an analysis of the constraints on the property of dark energy from the current...
Supernova Constraints on Models of Neutrino Dark Energy (2005)
Li, Hong, Feng, Bo, Xia, Jun-Qing, Zhang, Xinmin
In this paper we use the recently released Type Ia Supernova (SNIa) data to constrain the interactions between the neutrinos and the dark energy scalar fields. In the analysis we take the dark energy...
Perturbations of the Quintom Models of Dark Energy and the Effects on Observations (2005)
Zhao, Gong-Bo, Xia, Jun-Qing, Li, Mingzhe, Feng, Bo, Zhang, Xinmin
We study in this paper the perturbations of the quintom dark energy model and the effects of quintom perturbations on the current observations. Quintom describes a scenario of dark energy where the...
Constraints on Oscillating Quintom from Supernova, Microwave Background and Galaxy Clustering (2004)
Xia, Jun-Qing, Feng, Bo, Zhang, Xinmin
We consider in this paper a simple oscillating Quintom model of dark energy which has two free parameters and an equation of state oscillating and crossing -1. For low redshifts the equation of state...