Equation Icon  ⟨ ⟩ ( )( ) q Φ μ = − (δm )aμ − 1-(1 − 6ξ)q2Ru μ + q2 gμν + u μuν 1a˙ν + 1R νλu λ + qΦtaμil, (17.44 ) 12 3 6