- #1

- 30

- 0

A light with wavelength ##\lambda## is propagating in flat spacetime. The light redshifts as its wavelength gets larger and larger. In quantum field theory, this causes an infrared divergence of the field.

What I want to know is the way to tame the divergence. More specifically, I want to calculate a cutoff wavelength ##\Lambda_{\mathrm{cut}}##.

Are there any articles or textbooks cover this topic? If any, pedagogical ones are appreciated.

Thanks.