Time-reversal symmetry violation and the structure of Superconducting Order Parameter of PrOs${}_4$Sb${}_{12}$

The antisymmetrised two-electron functions are constructed for the point group T${}_h$, i.e. the symmetry group of unconventional superconductor PrOs$% {4}$Sb${14}$\mathrm{.},anditssubgroupD$_{2h}$.The nodal structure of these function depending on the wavevector group is investigated. Theoretical nodal structure of these functions made possible to explain the experimental nodal structure PrOs${}_4$Sb${}_{14}$. as a result of time-reversal symmetry violation.