arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1904.01616hep-th
收藏

任意维的Wilson-Fisher不动点

Wilson-Fisher fixed points for any dimension

Roberto Trinchero

摘要:

研究了非定域标量场论的临界行为。这个理论有一个非定域的四次相互作用项,它涉及拉普拉斯算子的实幂-β。可以调整参数β,以便使该相互作用对于任何维度都是边际的。计算了对应于耦合常数重整化、质量重整化和场重整化的最低阶费曼图。在所有的情况下,一个非平凡的IR不动点。值得注意的是,对于不同于4的维度,需要在单圈水平上进行场重整化。当d=4时,理论简化为通常的定域场^{4}场论,并且场重整化需要从双圈水平开始。计算了2、3、4和5维的临界指数ν和η。对于大于4的维数,临界指数η在ε>0时为负,这表明违反了幺正性界限。

英文摘要:

The critical behavior of a non-local scalar field theory is studied. This theory has a non-local quartic interaction term which involves a real power -βof the Laplacian. The parameter βcan be tuned so as to make that interaction marginal for any dimension. The lowest order Feynman diagrams corresponding to coupling constant renormalization, mass renormalization, and field renormalization are computed. In all cases a non-trivial IR fixed point is obtained. Remarkably, for dimensions different from 4, field renormalization is required at the one-loop level. For d=4, the theory reduces to the usual local ϕ^{4} field theory and field renormalization is required starting at the the two-loop level. The critical exponents νand ηare computed for dimensions 2,3,4 and 5. For dimensions greater than four, the critical exponent ηturns out to be negative for ε>0, which indicates a violation of the unitarity bounds.

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。

↑