Abstract

This is the second part in a four-paper sequence, which establishes the threshold conjecture and the soliton bubbling vs. scattering dichotomy for the hyperbolic Yang–Mills equation in the $\left(4+1\right)$-dimensional space-time. This paper provides the key gauge-dependent analysis of the hyperbolic Yang–Mills equation.

We consider topologically trivial solutions in the caloric gauge, which was defined in the first paper of the sequence using the Yang–Mills heat flow. In this gauge, we establish a strong form of local well-posedness, where the time of existence is bounded from below by the energy concentration scale. Moreover, we show that regularity and dispersive properties of the solution persist as long as energy dispersion is small. We also observe that fixed-time regularity (but not dispersive) properties in the caloric gauge may be transferred to the temporal gauge without any loss, proving as a consequence small-data global well-posedness in the temporal gauge.

We use the results in this paper in subsequent papers to prove the sharp threshold theorem in caloric gauge in the trivial topological class, and the dichotomy theorem in arbitrary topological classes.

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Mathematical Subject Classification 2010

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