The φⁿ trajectory bootstrap

The Green's functions Gₙ=φⁿ and their self-consistent equations admit analytic continuations to complex n. The indeterminacy of bootstrap problems can be resolved by the principle of minimal singularity. We use the harmonic oscillator to illustrate various aspects of the bootstrap analysis, such as the large n expansion, matching conditions, exact quantization condition, and high energy asymptotic behavior. For the Hermitian quartic and non-Hermitian cubic oscillators, we revisit the φⁿ trajectories at non-integer n by the standard wave function formulation. The results are in agreement with the minimally singular solutions. Using the matching procedure, we obtain accurate solutions for anharmonic oscillators with higher powers. In particular, the existence of Gₙ with non-integer n allows us to bootstrap the PT invariant oscillators with non-integer powers.