250,679 research outputs found
Shear viscosity to entropy density ratio of QCD below the deconfinement temperature
No full textAbstractUsing chiral perturbation theory we investigate the QCD shear viscosity (η) to entropy density (s) ratio below the deconfinement temperature (∼170 MeV) with zero baryon number density. It is found that η/s of QCD is monotonically decreasing in temperature (T) and reaches 0.6 with estimated ∼50% uncertainty at T=120 MeV. A naive extrapolation of the leading order result shows that η/s reaches the 1/4π minimum bound proposed by Kovtun, Son, and Starinets using string theory methods at T∼200 MeV. This suggests a phase transition or cross over might occur at T≲200 MeV in order for the bound to remain valid. Also, it is natural for η/s to stay close to the minimum bound around the phase transition temperature as was recently found in heavy ion collisions
Ji Han xiang chen zhuan
No full text[V.1-2]. 前漢相臣傳 : 十二卷 -- [v.3-5]. 後漢相臣傳 : 十六卷 -- [v.6]. 季漢相臣傳 : 六卷.[V.1-2]. Qian Han xiang chen zhuan : shi er juan -- [v.3-5]. Hou Han xiang chen zhuan : shi liu juan -- [v.6]. Ji Han xiang chen zhuan : liu juan.魏顯國纂述 ; 魏一鵬編次.綫裝, 1函.框22x14.3公分, 10行20字, 白口, 單黑魚尾, 四周單邊, 版心上鐫題名, 中鐫卷次, 下鐫葉次及小題.刻書年據《四庫全書存目叢書》鈐有"元鑑齋", "潤州笪重光鑒定印", "毛氏收藏子孫永保"印.Library's copy: 本館只存《歷代相臣傳》中《前漢》, 《後漢》, 《季漢》共六冊.Xian zhuang, 1 han.Kuang 22 x 14.3 gong fen, 10 hang 20 zi, bai kou, dan hei yu wei, si zhou dan bian, ban xin shang juan ti ming, zhong juan juan ci, xia juan ye ci ji xiao ti.Ke shu nian ju "Si ku quan shu cun mu cong shu"Wei Xianguo zuan shu ; Wei Yipeng bian ci.Qian you "Yuan jian zhai", "Runzhou Da Chongguang jian ding yin", "Mao shi shou cang zi sun yong bao" yin.Library's copy: ben guan zhi cun "Li dai xiang chen zhuan" zhong "Qian Han", "Hou Han", "Ji Han" gong liu ce
Model analysis of thermal UV-cutoff effects on the chiral critical surface at finite temperature and chemical potential
No full text
Deuteron Compton scattering in effective field theory and spin-independent nucleon polarizabilities
No full textTwisted valence quarks and hadron interactions on the lattice
No full textAbstractWe consider QCD with valence and sea quarks obeying different boundary conditions. We point out that the energy of low lying two hadron states do not depend on the boundary condition of the sea quarks (up to exponentially small corrections). Thus, the advantages in using twisted boundary conditions on the lattice QCD extraction of nucleon–nucleon phase shifts can be gained without the need of new gauge configurations, even in fully unquenched calculations
- …
