# stress energy tensor for a massless particle

I want to express stress energy tensor for a massless particle. I know that 4-momentum of a massless particle is $$k = (E , EV_x , EV_y, EV_z)$$ but I don't know how to use $$k$$ to construct the stress energy tensor.

• In homework problems, you're supposed to show us how you'e made progress so far. That might lead to some complaints about your question. – Carl Brannen Apr 15 at 23:41
• Is this homework? If so, then please add the homework-and-exercises tag, and see the help pages for info on what is expected for homework questions. – Ben Crowell Apr 16 at 0:58