Renormalized energy-momentum tensor of e??? e??·4 theory in curved space-time

摘要

Divergenceless expression for the energy-momentum tensor of scalar ???eld is obtained using the momentum cut-off regularization technique. We consider a scalar ???eld with quartic self-coupling in a spatially ???at (3+1)-dimensional Robertsona€“Walker space-time, having arbitrary mass and coupled to gravity. As special cases, energy-momentum tensor for conformal and minimal coupling are also obtained. The energy-momentum tensor is observed to exhibit trace anomaly in curved space-time.