sanctus Posted July 20, 2007 Report Posted July 20, 2007 I have a stupid, I think at least, question on the energy-momentum tensor. What does the trace exactly mean? In the case of a perfect fluid we would have the trace being [imath]\rho[/imath]+3p i.e. the energy density plus 3 times the pressure. It is the total what? What does it imply if it is say zero? Thanks in advance for answering this, I think really basic, question! Quote
sanctus Posted July 22, 2007 Author Report Posted July 22, 2007 Or in other words what does the strong energy condition intuitively mean? Quote
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