The gravitational polarization tensor of thermal $λϕ^4$ theory

The low-momentum structure of the gravitational polarization tensor of an ultrarelativistic plasma of scalar particles with $λϕ^4$ interactions is evaluated in a two-loop calculation up to and including order $λ^{3/2}$. This turns out to require an improved perturbation theory which resums a local thermal mass term as well as nonlocal hard-thermal-loop vertices of scalar and gravitational fields.

No reviews yet.

No comments yet.