New posts in Perturbation Theory

Linearizing Gravity to ${\cal O}(h^3)$

Self energy, 1PI, and tadpoles

Tree level QFT and classical fields/particles

In what sense are loop diagrams quantum corrections?

References for cosmological perturbation theory in the ADM formalism

A pedestrian explanation of Renormalization Groups - from QED to classical field theories

Perturbative solution to $x^3+x-1=0$

Matrix function converges, how about the eigenvalues?

Can epsilon be a matrix?

Series expansion of the determinant for a matrix near the identity