Comparing potential-driven DBI-inspired non-minimal kinetic coupling(Dinkic) inflation with observational data

In our previous work [1], a new kind of inflation model was proposed, which has the interesting property that its perturbation equation of motion gets a correction of k4, due to the non-linearity of the kinetic term.Nonetheless, the scale-invariance of the power spectrum remains valid, both in large-k and small-k limits. In this paper, we investigate in detail the spectral index, the index running and the tensor/scalar ratio in this model, especially in the potential-driven case, and compare the results with the current PLANCK/BICEP observational data.We also discuss the tensor spectrum in this case, which is expected to be tested by future observations of primordial gravitational waves.     

Bulk viscosity of hot dense Quark matter in the PNJL model~

Starting from the Kubo formula and the QCD low energy theorem, we study the the bulk viscosity of hot dense quark matter in the PNJL model from the equation of state. We show that the bulk viscosity has a sharp peak near the chiral phase transition, and that the ratio of bulk viscosity over entropy rises dramatically in the vicinity of the phase transition. These results agree with those from the lattice and other model calculations. In addition, we show that the increase of chemical potential raises the bulk viscosity.     

Bulk viscosity of hot dense Quark matter in the PNJL model

Starting from the Kubo formula and the QCD low energy theorem, we study the the bulk viscosity of hot dense quark matter in the PNJL model from the equation of state. We show that the bulk viscosity has a sharp peak near the chiral phase transition, and that the ratio of bulk viscosity over entropy rises dramatically in the vicinity of the phase transition. These results agree with those from the lattice and other model calculations. In addition, we show that the increase of chemical potential raises the bulk viscosity.     

夸克胶子等离子体中的次带头阶得拜屏蔽质量

采用实时有限温度下的QCD,考虑到胶子的衰减率计算了QGP中次领头阶得拜屏蔽质量的贡献,克服了通常计算中的红外发散的困难,且不必引入非微扰的磁屏蔽质量作红外截断.指出了所得结果的正定性和规范无关性并与格点模拟的结果进行了比较.     

热场动力学中的切割图方法及热格林函数的虚部

在热场动力学的框架下,依据有限温度下的切割定理提出了一套直观的费曼图切割方法及其相应的费曼规则,从而给出了一条计算热格林函数应部的方便途径.作为应用的例子我们分别讨论了二点、三点和四点格林函数的虚部.     

高温下弱电相变的自洽研究

通过对蝌蚪图中的硬热圈重求和的方法自洽地计算了标准模型在有中性流作用下的高温有效势到(λ^3/2,g³,g^'3)级,克服了通常计算中存在的困难,证明了弱电相变是一级相变并给出了临界温度.     

高温高密下W-S模型的对称性恢复和等离子体效应

从W-S模型的完全拉氏量出发,按巨正则系统的温度场论计算了该模型在有限温度和密度下的有效势,讨论了高温高密下弱电系统的两个基本热效应.发现热效应不仅可以抵消Higgs机制的效应使对称性得到恢复,而且还会使规范粒子保留有来自极化效应导致的质量.     

热密QED中的德拜质量

从QED中光子传播子的Schweinger-Dyson方程出发,得到一个有用的德拜质量和热力学压强之间的关系.利用这个关系以及有限温度与有限化学势下的相关压强计算了德拜质量的双圈修正.其结果显示双圈修正减少了德拜屏蔽质量.最后还讨论了QED等离子体中的磁质量     

φ_6~3的媒质效应和热不稳定性(英文)

在有限温度下运用硬热圈近似求得 φ36 理论单圈自能 ,进而求得有限质量和衰变率 .发现在临界温度Tc 以上存在热不稳定性 ,而有效温度和衰变率则分别正比于gT和gT .最后将所得结果与热QCD比较     

ρ介子质量对温度和化学势的依赖性

考虑到真空效应,用有效拉氏量方法给出了介质对ρ介子质量的影响,发现ρ介子质量随温度和化学势的升高而降低.然后用所得到的结果检验了Brown-Rho标度定理的适用范围.