The d = 6 gradient (A-function) structure of the phi^3 RG flow extends to d = 6 − epsilon, requiring one new three-loop constraint, Eq. (22), that the MS coefficients satisfy.
There are 5 irreducible bubbles that contribute to the A function at this order A(2) =a2,a +a2,b +a2,c +a2,d +a2,e
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Gradient properties of $\varphi^3$ in $d=6-\varepsilon$
The d = 6 gradient (A-function) structure of the phi^3 RG flow extends to d = 6 − epsilon, requiring one new three-loop constraint, Eq. (22), that the MS coefficients satisfy.