- #1
Neitrino
- 137
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Dear PF,
I am a little bit confused could you pls help me ...
Suppose I a have a scatering or conversion of two particles via graviton propagator.
Graviton propagator couples with energy-momentum tensor of matter fields.
So can i assume that vertex to which graviton propagator is coupled is in fact energy-momentum tensor ?
Energy-momentum tensor is conserved and thus if i take graviton propagator in some general case where i have graviton momentum in numerator it should give me vanishing contribution.
But energy-momentum tensor (which I cast in this case as a vertxe +external lines) contains two different momentum: ingoing momentum p1 and ingoing momentum p2, so my propagator momentum will be q=p1+p2... so does it mean that when I express graviton momentum through p1+p2 and and couple it to a vertxe i will have identical zero...?
Thanks
I am a little bit confused could you pls help me ...
Suppose I a have a scatering or conversion of two particles via graviton propagator.
Graviton propagator couples with energy-momentum tensor of matter fields.
So can i assume that vertex to which graviton propagator is coupled is in fact energy-momentum tensor ?
Energy-momentum tensor is conserved and thus if i take graviton propagator in some general case where i have graviton momentum in numerator it should give me vanishing contribution.
But energy-momentum tensor (which I cast in this case as a vertxe +external lines) contains two different momentum: ingoing momentum p1 and ingoing momentum p2, so my propagator momentum will be q=p1+p2... so does it mean that when I express graviton momentum through p1+p2 and and couple it to a vertxe i will have identical zero...?
Thanks