Generalizations of noncommutative Noether's problem

Noether's problem is classical and very important problem in algebra. It is an intrinsecally interesting problem in invariant theory, but with far reaching applications in the sutdy of moduly spaces, PI-algebras, and the Inverse problem of Galois theory, among others. To obtain an noncommutative analogue of Noether's problem, one would needs a significant skew field that shares a role similar to the field of ratioal functions. Given the importance of the Weyl fields due to Gelfand-Kirillov's Conjecture, in 2006 J. Alev and F. Dumas introduced what is nowdays called the noncommutative Noether's problem, using the Weyl fields. Many papers in recent years {FMO}, {EFOS}, {FS}, {Tikaradze} have been dedicated to the subject. The aim of this article is to generalize the main result of {FS} for more general versions of Noether's problem; and consider its analogue in prime characteristic.