In Electrodynamics, this tensor is defined in terms of the Maxwell Tensor as follows:

    Tμν = (1/μ0)(FμρFνρ-(1/4)ημνFρσFρσ)
For a fluid with pressure p and density ρ,
    Tμν = (ρ+p)uμuν + pgμν

Together these act as the source for the gravitational field in General Relativity.

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