More on the Celestial Soft Symmetry Algebra in the ${\cal N}=8$ Supergravity

Abstract

We construct the operator product expansions (OPEs) of the ${\cal N}=8$ ${\rm w}_{1+\infty}$ currents (obtained from the antiholomorphic light transform) with the matter fields in the ${\cal N}=8$ supergravity. The corresponding (anti)commutators are obtained from the double contour integrals using the above OPEs. By computing the triple (anti)commutators consisting of current-current-matter (i.e., the Jacobi identity for fixed last element), the previously known ${\cal N}=8$ celestial soft symmetry algebra between these currents (in the antiholomorphic sector) is reproduced. We repeat the above procedure by taking the holomorphic light transform and the OPEs of the ${\cal N}=8$ ${\rm \bar{w}}_{1+\infty}$ currents with the matter fields and the corresponding (anti)commutators are obtained. We also obtain another type of ${\cal N}=8$ celestial soft symmetry algebra between these currents (in the holomorphic sector). As a subalgebra in the antiholomorphic and holomorphic sectors, there exists the ${\cal N}=8$ extended BMS (Bondi, van der Burg, Metzner, and Sachs in 1962) algebra. We analyze the above results from the ${\cal N}=8$ conformally {\it soft} ${\rm w}_{1+\infty}$ (or ${\rm \bar{w}}_{1+\infty}$) currents in the antiholomorphic (or holomorphic) sector. The nontrivial soft theorems for the graviton, the gravitinos and the graviphotons are described. Finally, using the shadow transform (the consecutive composition of holomorphic and antiholomorphic light transforms), we obtain the OPEs of the ${\cal N}=8$ {\it shadow} ${\rm w}_{1+\infty}$ (or ${\rm \bar{w}}_{1+\infty}$) currents with the matter fields where the stress-energy tensor, the supercurrents and the supertranslation generator of the ${\cal N}=8$ extended BMS algebra are identified.