Nonlinear Eigenvalues and Analytic-hypoellipticity

This work studies the failure of analytic-hypoellipticity (AH) of two partial differential operators.

The operators studied are sums of squares of real analytic vector fields and satisfy Hormander's condition; a condition on the rank of the Lie algebra generated by the brackets of the vector fields.

These operators are necessarily $C^\infty$-hypoelliptic.

By reducing to an ordinary differential operator, the author shows the existence of nonlinear eigenvalues, which is used to disprove analytic-hypoellipticity of the original operators.