76 citations · 249 across the 13 of their papers we have counts for
13 papers
Exploring arbitrarily high orders of optimized perturbation theory in QCD with nf -> 16.5
P. M. Stevenson
Perturbative QCD with nf flavours of massless quarks becomes simple in the hypothetical limit nf -> 16.5, where the leading beta-function coefficient vanishes. The Banks-Zaks (BZ)…
The effective exponent gamma(Q) and the slope of the beta function
P. M. Stevenson
The slope of the beta function at a fixed point is commonly thought to be RG invariant and to be the critical exponent gamma* that governs the approach of any physical quantity R t…
Fixed and Unfixed Points: Infrared limits in optimized QCD perturbation theory
P. M. Stevenson
Perturbative QCD, when optimized by the principle of minimal sensitivity at fourth order, yields finite results for R(e+e-)(Q) down to Q=0. For two massless flavours (n_f=2) this o…
Optimization of QCD Perturbation Theory: Results for R(e+e-) at fourth order
P. M. Stevenson
Physical quantities in QCD are independent of renormalization scheme (RS), but that exact invariance is spoiled by truncations of the perturbation series. "Optimization" correspond…
Comparison of perturbative RG theory with lattice data for the 4d Ising model
P. M. Stevenson
Predictions for (phi^4)_4 theory from renormalization-group-improved perturbation theory, as formulated by Luescher and Weisz, are compared to published (and some unpublished) data…
How do sound waves in a Bose-Einstein condensate move so fast?
P. M. Stevenson
Low-momentum excitations of a dilute Bose-Einstein condensate behave as phonons and move at a finite velocity v_s. Yet the atoms making up the phonon excitation each move very slow…