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arXiv 0704.2880hep-th
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模糊额外维数:降维、动态生成与重正化

Fuzzy Extra Dimensions: Dimensional Reduction, Dynamical Generation and Renormalizability

P. Aschieri, H. Steinacker, J. Madore, P. Manousselis, G. Zoupanos

摘要:

我们检查规范理论定义在更高的维度,额外的维度形成一个模糊(有限矩阵)流形。首先,我们重新解释这些规范理论作为四维理论与卡鲁扎-克莱因模式,然后我们执行一个推广的à la Forgacs-Manton降维。我们强调一些引人注目的特点出现在后一种情况下,如(i)外观的非阿贝尔规范理论在四维开始从阿贝尔规范理论在高维,(ii)的事实,即自发对称性破缺的理论完全发生在额外的维度和(iii)重正化的理论都在更高以及在四维。然后,我们逆着上述方法,提出了一个可重整化的四维SU(N)规范理论与一个合适的标量场的多重态,通过自发对称性破缺动态发展额外的维度的形式的模糊球。我们明确地发现塔的大规模卡鲁扎-克莱因模式符合规范理论的解释$M^4 \times S^2$,标量被解释为规范场$S^2$。根据模型的参数,低能规范群可以是$SU(n_1) \times SU(n_2) \times U(1)$的形式。

英文摘要:

We examine gauge theories defined in higher dimensions where theextra dimensions form a fuzzy (finite matrix) manifold. First we reinterpret these gauge theories as four-dimensional theories with Kaluza-Klein modes and then we perform a generalized à la Forgacs-Manton dimensional reduction. We emphasize some striking features emerging in the later case such as (i) the appearance of non-abelian gauge theories in four dimensions starting from an abelian gauge theory in higher dimensions, (ii) the fact that the spontaneous symmetry breaking of the theory takes place entirely in the extra dimensions and (iii) the renormalizability of the theory both in higher as well as in four dimensions. Then reversing the above approach we present a renormalizable four dimensional SU(N) gauge theory with a suitable multiplet of scalar fields, which via spontaneous symmetry breaking dynamically develops extra dimensions in the form of a fuzzy sphere. We explicitly find the tower of massive Kaluza-Klein modes consistent with an interpretation as gauge theory on $M^4 \times S^2$, the scalars being interpreted as gauge fields on $S^2$. Depending on the parameters of the model the low-energy gauge group can be of the form $SU(n_1) \times SU(n_2) \times U(1)$.

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