RG limit cycles and unconventional fixed points in perturbative QFT
RG limit cycles and unconventional fixed points in perturbative QFT
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微扰 QFT 中的 RG 极限环和非常规不动点
DOI:
10.1103/physrevd.103.046015
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发表时间:
2021
影响因子:
5
通讯作者:
Popov, Fedor K.
中科院分区:
文献类型:
--
作者:
Jepsen, Christian B.;Klebanov, Igor R.;Popov, Fedor K.
We study quantum field theories with sextic interactions indimensions, where the scalar fieldsform irreducible representations under theorglobal symmetry group. We calculate the beta functions up to four-loop order and find the renormalization group (RG) fixed points. In an example of largeequivalence, the parenttheory and its antisymmetric projection exhibit identical largebeta functions that possess real fixed points. However, for projection to the symmetric traceless representation of, the largeequivalence is violated by the appearance of an additional double-trace operator not inherited from the parent theory. Among the largefixed points of this daughter theory we find complex conformal field theories. The symmetric tracelessmodel also exhibits very interesting phenomena when it is analytically continued to small noninteger values of. Here we find unconventional fixed points, which we call “spooky.” They are located at real values of the coupling constants, but two eigenvalues of the Jacobian matrixare complex. When these complex conjugate eigenvalues cross the imaginary axis, a Hopf bifurcation occurs, giving rise to RG limit cycles. This crossing occurs for, and for a small range ofabove this value we find RG flows that lead to limit cycles.
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DOI:
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发表时间:
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期刊:
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影响因子:
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