Instantons in ${\varphi }^4$ Theories: Transseries, Virial Theorems and Numerical Aspects

Ludovico T. Giorgini, Ulrich D. Jentschura, Enrico M. Malatesta +2

We discuss numerical aspects of instantons in two- and three-dimensional ${\varphi }^4$ theories with an internal $O(N)$ symmetry group, the so-called $N$-vector model. Combining asymptotic…