Pressure to order $g^8\ast log(g)$ in ${\varphi }^4$-theory at weak coupling

Jens O. Andersen, Lars Kyllingstad, Lars E. Leganger

We calculate the pressure of massless ${\varphi }^4$-theory to order $g^8\log (g)$ at weak coupling. The contributions to the pressure arise from the hard momentum scale of order $T$ and the…