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2014

A challenge to the $a$-theorem in six dimensions

Grinstein, Benjamin, Stergiou, Andreas, Stone, David et al.

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The possibility of a strong $a$-theorem in six dimensions is examined in multi-flavor $\phi^3$ theory.

Contrary to the case in two and four dimensions, we find that in perturbation theory the relevant quantity $\tilde{a}$ increases monotonically along flows away from the trivial fixed point.
$\tilde{a}$ is a natural extension of the coefficient $a$ of the Euler term in the trace anomaly, and it arises in any even spacetime dimension from an analysis based on Weyl consistency conditions.
We also obtain the anomalous dimensions and beta functions of multi-flavor $\phi^3$ theory to two loops.

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These χ I J \chi_{IJ} and w I w_{I} in d = 6 d=6 were denoted ℋ I J 1 \mathcal{H}_{IJ}^{1} and ℋ I 1 \mathcal{H}_{I}^{1} respectively in [ 15 ]

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For more details the reader is referred to [ 15 ]

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We do not study fermions or vectors, which do not have interacting dynamics with classical scale invariance at the perturbative level in six dimensions

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