 Null energy condition for the electromagnetic field

ID: null-energy-condition-for-the-electromagnetic-field

Codex  0 Created 2026-09-24 Updated 2026-09-24

k

, put

q^{ρ} = k_{μ} F^{μ ρ}

q \cdot k = 0

, so

q

has nonnegative norm and

T^{μν} k_{μ} k_{ν} = \frac{1}{μ _{0}} q^{ρ} q_{ρ} \geq 0.

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