arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1602.01076hep-thcond-mat.str-el
收藏

关于共形QED中的$C_{J}$和$C_{T}$

On $C_{J}$ and $C_{T}$ in Conformal QED

Simone Giombi, Grigory Tarnopolsky, Igor R. Klebanov

摘要:

具有大量无质量费米子自由度$N$的QED在一定的时空维度范围内具有共形相位。我们使用一个大的$N$图解方法来计算领先的修正$C_T$,应力能量张量的两点函数的系数,和$C_J$,两点函数的系数的全球对称性电流。我们提出了明确的公式作为$d$的函数,并检查它们与2和$4-ε$维的期望。利用我们的结果,在更高的偶数维,我们找到了一个简洁的公式,共形麦克斯韦理论的$C_T$与更高的导数作用$F_{μν} (-\nabla^2)^{\frac{d}{2}-2} F^{μν}$。在$d=3$中,QED具有拓扑对称流,我们计算了对它的两点函数系数$C^{\textrm{top}}_{J}$的修正。我们还表明,在$d=3$中涉及QED的一些RG流服从$C_T^{\rm UV} > C_T^{\rm IR}$,并讨论了这个不等式的对称性破缺在小$N$值的可能影响。

英文摘要:

QED with a large number $N$ of massless fermionic degrees of freedom has a conformal phase in a range of space-time dimensions. We use a large $N$ diagrammatic approach to calculate the leading corrections to $C_T$, the coefficient of the two-point function of the stress-energy tensor, and $C_J$, the coefficient of the two-point function of the global symmetry current. We present explicit formulae as a function of $d$ and check them versus the expectations in 2 and $4-ε$ dimensions. Using our results in higher even dimensions we find a concise formula for $C_T$ of the conformal Maxwell theory with higher derivative action $F_{μν} (-\nabla^2)^{\frac{d}{2}-2} F^{μν}$. In $d=3$, QED has a topological symmetry current, and we calculate the correction to its two-point function coefficient, $C^{\textrm{top}}_{J}$. We also show that some RG flows involving QED in $d=3$ obey $C_T^{\rm UV} > C_T^{\rm IR}$ and discuss possible implications of this inequality for the symmetry breaking at small values of $N$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑