The $\mathcal{N}=2,4$ Supersymmetric Linear $W_{\mathrm{\infty }}[\lambda ]$ Algebras for Generic $\lambda$ Parameter

The four different kinds of currents are given by the multiple $(\beta ,\gamma )$ and $(b,c)$ ghost systems with a multiple product of derivatives. We determine their complete algebra where the structure constants depend on the deformation parameter $\lambda$ appearing in the conformal weights of above fields nontrivially and depend on the generic spins $h_1$ and $h_2$ appearing on the left hand sides in the (anti)commutators. By taking the linear combinations of these currents, the $\mathcal{N}=4$ supersymmetric linear $W_{\mathrm{\infty }}[\lambda ]$ algebra (and its $\mathcal{N}=4$ superspace description) for generic $\lambda$ is obtained explicitly. Moreover, we determine the $\mathcal{N}=2$ supersymmetric linear $W_{\mathrm{\infty }}[\lambda ]$ algebra for arbitrary $\lambda$. As a by product, the $\lambda$ deformed bosonic $W_{1+\mathrm{\infty }}[\lambda ]\times W_{1+\mathrm{\infty }}[\lambda +\frac{1}{2}]$ subalgebra (a generalization of Pope, Romans and Shen’s work in $1990$) is obtained. The first factor is realized by $(b,c)$ fermionic fields while the second factor is realized by $(\beta ,\gamma )$ bosonic fields. The degrees of the polynomials in $\lambda$ for the structure constants are given by $(h_1+h_2-2)$. Each $w_{1+\mathrm{\infty }}$ algebra from the celestial holography is reproduced by taking the vanishing limit of other deformation prameter $q$ at $\lambda =0$ with the contractions of the currents.