we expand the graviton momentum $p^i$ in the orthonormal basis adapted to the foliation of the space-time ł[i9]{} u\^i = (1,0, 0,0,0)e\^[y]{},n\^i =(0,0,0,0,1),e\^i\_a= (0,1\_a,0,0 ,0) .We have $$p^i = E u^i +m n^i + q^a e^i_a
,$$ and $p_i p^i = -E^2 +m^2 +q_a q^a .$

Projections of the components of the bulk energy-momentum tensor on the plane $y=0$ ł[i7]{} Ţ\_Ţ\^[ij]{}u\_i n\_j ,Ţ\_Ţ\^[ij]{}u\_i u\_j,Ţ\_Ţ\^[ij]{}n\_i n\_j have the form [@lan2] [^9] ł[i6]{} && Ţ\_(0,t) =-\^2 T\^8, Ţ\_(0,t)= \^2 T\^8,\
&&Ţ\_(0,t) =\^2 T\^8 ,where $T$ is the temperature of the Universe at the time $t$.

Separating in $\c{T}_{\b{0}\b{4}}$ the $y$-dependence, we have ł[g12]{} Ţ\_ (y,t) = ()\^5 e\^[5y]{} Ţ\_ (0,t). The same relations hold for all components: $\c{T}_{\b{i}\b{j}}(y,t)=(N(y,t)e^{\m y}/N(0,t))^5 \c{T}_{\b{i}\b{j}}(0,t) $.

Our next aim is to determine the normalization factor $N(y,t)$. Lacking an independent definition of momentum of massless particle which could enable us to fix the normalization factor, let us consider the energy-momentum tensor conservation equations in the bulk $\nabla_i 
\c{T}^{ij}(y,t)=0$ and try to extract from these equations an information on $y$-dependence of the energy-momentum tensor.

The component $j=0$ of the conservation equations is ł[g10]{} \_i Ţ\^[i0]{}(y,t)= \_4 Ţ\^[40]{} +(3\^0\_[04]{}+\^a\_[a4]{}) Ţ\^[40]{}+ \_0 Ţ\^[00]{}+ (2\^0\_[00]{}+\^a\_[a0]{}) Ţ\^[00]{}+\^0\_[ab]{}Ţ\^[ab]{}=0. Substituting the explicit expressions for the 