Cai, Yi-Fu, Qiu, Taotao, Brandenberger, Robert, Zhang, Xinmin
We study the cosmology of a Lee-Wick type scalar field theory. First, we consider homogeneous and isotropic background solutions and find that they are nonsingular, leading to cosmological bounces....
Cosmological CPT violating effect on CMB polarization (2008)
A dark energy scalar (or a function of the Ricci scalar) coupled with derivative to the matter fields will violate the $CPT$ symmetry during the expansion of the universe. This type of cosmological...
Evolution of Metric Perturbations in Quintom Bounce model (2008)
We in the paper study the metric perturbations generated in a bouncing universe driven by the Quintom matter. Firstly, we review the background evolution of Quintom Bounce and the power spectrum of...
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....
Oscillating universe with quintom matter (2008)
Xiong, Hua-Hui, Cai, Yi-Fu, Qiu, Taotao, Piao, Yun-Song, Zhang, Xinmin
In this paper, we study the possibility of building a model of the oscillating universe with quintom matter in the framework of 4-dimensional Friedmann-Robertson-Walker background. Taking the...
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...
Systematic evaluation of variability in ChIP-chip experiments using predefined DNA targets. (2008)
Johnson, David S., Li, Wei, Gordon, D. Benjamin, Bhattacharjee, Arindam, Curry, Bo, Ghosh, Jayati, ...
The most widely used method for detecting genome-wide protein-DNA interactions is chromatin immunoprecipitation on tiling microarrays, commonly known as ChIP-chip. Here, we conducted the first...
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...
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...
Cyclic Universe with Quintom matter in Loop Quantum Cosmology (2007)
Xiong, Hua-Hui, Qiu, Taotao, Cai, Yi-Fu, Zhang, Xinmin
In this paper, we study the possibility of model building of cyclic universe with Quintom matter in the framework of Loop Quantum Cosmology. After a general demonstration, we provide two examples,...
Optimising oligonucleotide array design for ChIP-on-chip (2007)
Nielsen, Fiona, Graef, Stefan, Zhang, Xinmin, Kurtz, Stefan, Denissov, Sergei, Green, Roland, ...
No abstract available.
On Perturbations of Quintom Bounce (2007)
Cai, Yi-Fu, Qiu, Taotao, Brandenberger, Robert, Piao, Yun-Song, Zhang, Xinmin
A Quintom universe with an equation-of-state crossing the cosmological constant boundary can provide a bouncing solution dubbed the Quintom Bounce and thus resolve the Big Bang singularity. In this...
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...
Model-based analysis of two-color arrays (MA2C) (2007)
Song, Jun S, Johnson, W Evan, Zhu, Xiaopeng, Zhang, Xinmin, Li, Wei, Manrai, Arjun K, ...
Abstract A novel normalization method based on the GC content of probes is developed for two-color tiling arrays. The proposed method, together with robust estimates of the model parameters, is shown...
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...
Bouncing Universe with Quintom Matter (2007)
Cai, Yi-Fu, Qiu, Taotao, Piao, Yun-Song, Li, Mingzhe, Zhang, Xinmin
The bouncing universe provides a possible solution to the Big Bang singularity problem. In this paper we study the bouncing solution in the universe dominated by the Quintom matter with an equation...
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...
A String-Inspired Quintom Model Of Dark Energy (2007)
Cai, Yi-fu, Li, Mingzhe, Lu, Jian-Xin, Piao, Yun-Song, Qiu, Taotao, Zhang, Xinmin
We propose in this paper a quintom model of dark energy with a single scalar field $\phi$ given by the lagrangian ${\cal L}=-V(\phi)\sqrt{1-\alpha^\prime\nabla_{\mu}\phi\nabla^{\mu}\phi +\beta^\prime...
Zhao, Gong-Bo, Xia, Jun-Qing, Li, Hong, Tao, Charling, Virey, Jean-Marc, Zhu, Zong-Hong, ...
We use the newly released 182 Type Ia supernova data combined with the third-year Wilkinson Microwave Anisotropic Probe data (WMAP3) and large scale structure (LSS) information including SDSS and...
Constraints on Dark Energy Models Including Gamma Ray Bursts (2006)
Li, Hong, Su, Meng, Fan, Zuhui, Dai, Zigao, Zhang, Xinmin
In this paper we analyze the constraints on the property of dark energy from cosmological observations. Together with SNe Ia Gold sample, WMAP, SDSS and 2dFGRS data, we include 69 long Gamma-Ray...
Cosmological CPT Violation, Baryon/Leptogenesis and CMB Polarization (2006)
Li, Mingzhe, Xia, Jun-Qing, Li, Hong, Zhang, Xinmin
In this paper we study the cosmological CPT-violation and its implications in baryo/leptogenesis and CMB polarization. We propose specifically a variant of the models of gravitational leptogenesis....
Probing for variation of neutrino mass with current observations (2006)
Zhao, Gong-Bo, Xia, Jun-Qing, Zhang, Xinmin
With the latest astronomical data including Cosmic Microwave Background (WMAP three year, CBI, ACBAR, VSA), Type Ia Supernova ("gold sample"), Galaxy Clustering (SDSS 3-D matter power, Lyman-$\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...
Cosmic Duality in Quintom Universe (2006)
Cai, Yi-Fu, Li, Hong, Piao, Yun-Song, Zhang, Xinmin
In this paper we study the duality in two-field Quintom models of Dark Energy. We find that an expanding universe dominated by Quintom-A field is dual to a contracting universe with Quintom-B field.
Two-Field Quintom Models in the w-w' Plane (2006)
Guo, Zong-Kuan, Piao, Yun-Song, Zhang, Xinmin, Zhang, Yuan-Zhong
The w-w' plane, defined by the equation of state parameter for the dark energy and its derivative with respect to the logarithm of the scale factor, is useful to the study of classifying the...
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....
Gamma rays from dark matter annihilation in the Draco and observability at ARGO (2006)
Bi, Xiao-Jun, Hu, Hong-Bo, Zhang, Xinmin
The CACTUS experiment recently observed a gamma ray excess above 50 GeV from the direction of the Draco dwarf spheroidal galaxy. Considering that Draco is dark matter dominated the gamma rays may be...
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)...
Detecting dark energy in long baseline neutrino oscillations (2005)
Gu, Pei-Hong, Bi, Xiao-Jun, Feng, Bo, Young, Bing-Lin, Zhang, Xinmin
In this paper, we discuss a possibility of studying properties of dark energy in long baseline neutrino oscillation experiments. We consider two types of models of neutrino dark energy. For one type...
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...
Dark Energy and Neutrino CPT Violation (2005)
Gu, Pei-Hong, Bi, Xiao-Jun, Zhang, Xinmin
In this paper we study the dynamical CPT violation in the neutrino sector induced by the dark energy of the Universe. Specifically we consider a dark energy model where the dark energy scalar...
Dark Energy and Its Interactions with Neutrinos (2005)
In this talk I will firstly review on the current constraints on the equation of state of the dark energy from observational data, then present a new scenario of dark energy dubbed {\it Quintom}. The...
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...
A Single Scalar Field Model of Dark Energy with Equation of State Crossing -1 (2005)
Li, Mingzhe, Feng, Bo, Zhang, Xinmin
In this paper we study the possibility of building models of dark energy with equation of state across -1 and propose explicitly a model with a single scalar field which gives rise to an equation of...
Possible Effects of Dark Energy on the Detection of Dark Matter Particles (2005)
Gu, Peihong, Bi, Xiao-Jun, Lin, Zhi-Hai, Zhang, Xinmin
We study in this paper the possible influence of the dark energy on the detection of the dark matter particles. In models of dark energy described by a dynamical scalar field such as the...
Two-field Models of Dark Energy with Equation of State Across -1 (2005)
Zhang, Xiao-fei, Li, Hong, Piao, Yun-Song, Zhang, Xinmin
In this paper, we study the possibility of building two-field models of dark energy with equation of state across -1. Specifically we will consider two classes of models: one consists of two scalar...
The c-quark EDM and production of $h_c$ in $e^+e^-$ annihilation (2004)
Bi, Xiao-Jun, Feng, Tai-Fu, Li, Xue-Qian, Maalampi, Jukka, Zhang, Xinmin
We analyze the charm quark electric dipole moment (EDM) in the minimal supersymmetric extension of the standard model (MSSM), including important two-loop gluino contributions. Considering the...
Vacuum Stability in Split Susy and Little Higgs Models (2004)
Datta, Alakabha, Zhang, Xinmin
We study the stability of the effective higgs potential in the split supersymmetry and Little Higgs models. In particular, we study the effects of higher dimensional operators in the effective...
Two-loop gluino contributions to neutron electric dipole moment in CP violating MSSM (2004)
Feng, Tai-Fu, Li, Xue-Qian, Maalampi, Jukka, Zhang, Xinmin
We analyze two-loop gluino corrections to the neutron electric dipole moment (EDM) in the minimal supersymmetry extension of the standard model (MSSM). The dependence of two-loop corrections on the...
Cosmological Evolution of Interacting Dark Energy Models with Mass Varying Neutrinos (2004)
Bi, Xiao-Jun, Feng, Bo, Li, Hong, Zhang, Xinmin
In this paper we consider the cosmological implications of dark energy models with a coupled system of a dynamical scalar field (the quintessence) and the neutrinos. By detailed numerical...
Testing Mass Varying Neutrino With Short Gamma Ray Burst (2004)
Li, Hong, Dai, Zigao, Zhang, Xinmin
In this paper we study the possibility of probing for the absolute neutrino mass and its variation with short Gamma Ray Burst (GRB). We have calculated the flight time difference between a massive...
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...
Cosmological Evolution of a Quintom Model of Dark Energy (2004)
Guo, Zong-Kuan, Piao, Yun-Song, Zhang, Xinmin, Zhang, Yuan-Zhong
We investigate in this paper the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has negative kinetic...
Interacting Dark Energy (2004)
In this paper I discuss some of the phenomenologies of models of the dark energy interacting with the ordinary matter. After a very brief review about the current constraint on the equation of the...
Oscillating Quintom and the Recurrent Universe (2004)
Feng, Bo, Li, Mingzhe, Piao, Yun-Song, Zhang, Xinmin
Current observations seem to mildly favor an evolving dark energy with the equation of state getting across -1. This form of dark energy, dubbed Quintom, is studied phenomenologically in this paper...
Gravitational Leptogenesis and Its Signatures in CMB (2004)
Feng, Bo, Li, Hong, Li, Mingzhe, Zhang, Xinmin
We study the phenomenologies in astrophysics and particularly in CMB associated with the gravitational leptogenesis. Our results show that future CMB polarization experiments, such as PLANCK and...
Phenomenology of quintessino dark matter -- Production of NLSP particles (2004)
Bi, Xiao-Jun, Wang, Jian-Xiong, Zhang, Chao, Zhang, Xinmin
In the model of quintessino as dark matter particle, the dark matter and dark energy are unified in one superfield, where the dynamics of the Quintessence drives the Universe acceleration and its...
Signal of the pion string at high-energy collisions (2004)
Huang, Tao, Li, Yunde, Mao, Hong, Nagasawa, Michiyasu, Zhang, Xinmin
We study the possible signals of a pion string associated with the QCD chiral phase transition in LHC Pb - Pb collision at energy $ \sqrt{s}=5.5$ TeV. In terms of the Kibble-Zurek mechanism we...
Dark Energy Constraints from the Cosmic Age and Supernova (2004)
Feng, Bo, Wang, Xiulian, Zhang, Xinmin
Using the low limit of cosmic ages from globular cluster and the white dwarfs: $t_0 > 12$Gyr, together with recent new high redshift supernova observations from the HST/GOODS program and previous...
Gravitational Leptogenesis and Neutrino Mass Limit (2004)
Li, Hong, Li, Mingzhe, Zhang, Xinmin
Recently Davoudiasl {\it et al} \cite{steinhardt} have introduced a new type of interaction between the Ricci scalar $R$ and the baryon current $J^{\mu}$, ${\partial_\mu R} J^{\mu}$ and proposed a...
Inflation in string-inspired cosmology and suppression of CMB low multipoles (2003)
Piao, Yun-Song, Tsujikawa, Shinji, Zhang, Xinmin
We construct a string-inspired nonsingular cosmological scenario in which an inflaton field is driven up the potential before the graceful exit by employing a low-energy string effective action with...
The FCNC top-squark decay as a probe of squark mixing (2003)
Han, Tao, Hikasa, Ken-ichi, Yang, Jin Min, Zhang, Xinmin
In supersymmetry (SUSY) the flavor mixing between top-squark (stop) and charm-squark (scharm) induces the flavor-changing neutral-current (FCNC) stop decay $\tilde t_1 \to c \tilde \chi^0_1$....
Thermal leptogenesis in a model with mass varying neutrinos (2003)
Bi, Xiao-Jun, Gu, Peihong, Wang, Xiulian, Zhang, Xinmin
In this paper we consider the possibility of neutrino mass varying during the evolution of the Universe and study its implications on leptogenesis. Specifically, we take the minimal seesaw model of...
Suppressing CMB Quadrupole with a Bounce from Contracting Phase to Inflation (2003)
Piao, Yun-Song, Feng, Bo, Zhang, Xinmin
Recent released WMAP data show a low value of quadrupole in the CMB temperature fluctuations, which confirms the early observations by COBE. In this paper, a scenario, in which a contracting phase is...
Double sneutrino inflation and its phenomenologies (2003)
Bi, Xiao-Jun, Feng, Bo, Zhang, Xinmin
In this paper we study double scalar neutrino inflation in the minimal supersymmetric seesaw model in light of WMAP. Inflation in this model is firstly driven by the heavier sneutrino field...
Fermionic partner of Quintessence field as candidate for dark matter (2003)
Bi, Xiao-Jun, Li, Mingzhe, Zhang, Xinmin
Quintessence is a possible candidate for dark energy. In this paper we study the phenomenologies of the fermionic partner of Quintessence, the Quintessino. Our results show that, for suitable choices...
Dark Energy and Neutrino Mass Limits from Baryogenesis (2003)
Gu, Peihong, Wang, Xiulian, Zhang, Xinmin
In this brief report we consider couplings of the dark energy scalar, such as Quintessence to the neutrinos and discuss its implications in studies on the neutrino mass limits from Baryogenesis....
Brane Inflation from Rotation of D4 Brane (2003)
Piao, Yun-Song, Zhang, Xinmin, Zhang, Yuan-Zhong
In this paper, a inflationary model from the rotation of D4-brane is constructed. We show that for a very wide rage of parameter, this model satisfies the observation and find that regarded as...
Double Inflation and the Low CMB Quadrupole (2003)
Recent released WMAP data show a low value of quadrupole in the CMB temperature fluctuations, which confirms the early observations by COBE. In this paper we consider a model of two inflatons with...
Modeling realistic Earth matter density for CP violation in neutrino oscillation (2003)
Shan, Lian-You, Wang, Yi-Fang, Yang, Chang-Gen, Zhang, Xinmin, Liu, Fu-Tian, Young, Bing-Lin
We examine the effect of a more realistic Earth matter density model which takes into account of the local density variations along the baseline of a possi ble 2100 km very long baseline neutrino...
An inflation model with large variations in spectral index (2003)
Feng, Bo, Li, Mingzhe, Zhang, Ren-Jie, Zhang, Xinmin
Recent fits of cosmological parameters by the Wilkinson Microwave Anisotropy Probe (WMAP) measurement favor a primordial scalar spectrum with varying index. This result, if stands, could severely...
Modification to the power spectrum in the brane world inflation driven by the bulk inflaton (2003)
Wang, Bin, Xue, Li-Hui, Zhang, Xinmin, Hwang, W-Y. P.
We compute the cosmological perturbations generated in the brane world inflation driven by the bulk inflaton. Different from the model that the inflation is a brane effect, we exhibit the...
Genomics of olfactory receptors and vomeronasal receptors (2003)
Mammals possess the remarkable ability to detect and discriminate many thousands of chemical compounds or odorants. The molecular receptors underlying the sense of smell comprise a large family of...
Non-minimally Coupled Tachyon and Inflation (2002)
Piao, Yun-Song, Huang, Qing-Guo, Zhang, Xinmin, Zhang, Yuan-Zhong
In this paper, we consider a model of tachyon with a non-minimal coupling to gravity and study its cosmological effects. Regarding inflation we will show that for a specific coupling of tachyon to...
Natural Inflation, Planck Scale Physics and Oscillating Primordial Spectrum (2002)
Wang, Xiulian, Feng, Bo, Li, Mingzhe, Chen, Xue-Lei, Zhang, Xinmin
In the ``natural inflation'' model, the inflaton potential is periodic. We show that Planck scale physics may induce corrections to the inflaton potential, which is also periodic with a greater...