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arXiv 1402.6029hep-lat
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由BSM规范理论的Dirac谱得到手征凝聚

The chiral condensate from the Dirac spectrum in BSM gauge theories

Zoltan Fodor, Kieran Holland, Julius Kuti, Daniel Nogradi, Chik Him Wong

摘要:

狄拉克算子在有限体积下的本征值编码了无质量理论中手征对称性是否自发破缺。我们将这个框架应用到一个特殊的BSM背景中,即在2指数对称(六重态)表象中具有N_f=2无质量味的SU(3)规范理论。我们的第一个结果是在一个单一的晶格间距。我们发现近零本征值密度和重整化群不变模数都表明了自发对称性破缺。定量地说,在通过本征值谱确定手征极限中的费米子凝聚体与直接测量手征凝聚体和GMOR关系的确定之间存在差异。我们评论这种差异的可能解释和进一步完善这项研究。

英文摘要:

The eigenvalues of the Dirac operator at finite volume encode whether or not chiral symmetry is spontaneously broken in a massless theory. We apply this framework in a particular BSM context, namely SU(3) gauge theory with N_f=2 massless flavors in the 2-index symmetric (sextet) representation. Our first results are at a single lattice spacing. We find that both the density of near-zero eigenvalues and the renormalization group invariant mode number indicate spontaneous symmetry breaking. Quantitatively, there is a discrepancy between the determination of the fermion condensate in the chiral limit via the eigenvalue spectrum and the determinations from direct measurements of the chiral condensate and the GMOR relation. We comment on possible explanations of this discrepancy and further refinements of this study.

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。

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