A fractional Kirchhoff problem involving a singular term and a critical nonlinearity

In this paper, we consider the following critical nonlocal problem: (equation presented). where ω is an open bounded subset of RN with continuous boundary, dimension N > 2s with parameter s ε (0, 1), 2.s = 2N/(N - 2s) is the fractional critical Sobolev exponent, λ > 0 is a real parameter, γ ε (0, 1) and M models a Kirchhoff-type coefficient, while (-δ) s is the fractional Laplace operator. In particular, we cover the delicate degenerate case, that is, when the Kirchhoff function M is zero at zero. By combining variational methods with an appropriate truncation argument, we provide the existence of two solutions.