t $$\begin{aligned} {\it l}_u\,\widehat{\mathfrak{U}} &=& \widehat{T}\,{\it l}_u\widehat{\mathfrak{s}} +{\Sigma _{\alpha}}_{\bot}^{\rm matt}\wedge{\it l}_u\underline{\vartheta}^\alpha -\underline{\Sigma}^{\rm matt}_\alpha\,{\it l}_u u^\alpha\nonumber\\ &&-F_{\bot}\wedge{\it l}_u P +\underline{F}\wedge{\it l}_u M\nonumber\\ &&-T_{\bot}^\alpha\wedge{\