Searching for modified growth patterns with tomographic surveys (2008)
Zhao, Gong-Bo, Pogosian, Levon, Silvestri, Alessandra, Zylberberg, Joel
In alternative theories of gravity, designed to produce cosmic acceleration at the current epoch, the growth of large scale structure can be modified. We study the potential of upcoming and future...
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...
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...
High-resolution temporal constraints on the dynamics of dark energy (2007)
Zhao, Gong-Bo, Huterer, Dragan, Zhang, Xinmin
We use the recent type Ia supernova, cosmic microwave background and large-scale structure data to shed light on the temporal evolution of the dark energy equation of state $w(z)$ out to redshift...
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...
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...
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-$\alpha$...
Detecting the ambient neutralino dark matter particles at accelerator (2006)
Feng, Tai-Fu, Li, Xue-Qian, Ma, Wen-Gan, Wang, Jian-Xiong, Zhao, Gong-Bo
In this work, we present a new strategy to investigate the possibility of direct detection of the ambient neutralino matter at accelerator. We calculate the cross sections for both elastic and...
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...
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....
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...
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...
Applicability of the Friedberg-Lee-Zhao method (2001)
Zhao, Gong-Bo, Ding, Yi-Bing, Li, Xue-Qian, Wang, Guo-Li
Friedberg, Lee and Zhao proposed a method for effectively evaluating the eigenenergies and eigen wavefunctions of quantum systems. In this work, we study several special cases to investigate...