6. Harmonic maps

Problem 6.1.
[S. Dragomir] Can one understand the existence, regularity, and stability properties of exponentially subelliptic harmonic maps? Specifically:
(a) What is the first variation of the exponential subharmonic energy?
(b) What is the second variation of the exponential subharmonic energy at a critical point? Can one deduce stability results from this?
(c) Can one prove regularity of weak solutions?
Cite this as: AimPL: Analysis and geometry on pseudohermitian manifolds, available at http://aimpl.org/pshermitian.