Vol. 15, No. 2, 2022

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An asymptotic expansion of two-bubble wave maps in high equivariance classes

Jacek Jendrej and Andrew Lawrie

Vol. 15 (2022), No. 2, 327–403

This is the first part of a two-paper series that establishes the uniqueness and regularity of a threshold energy wave map that does not scatter in both time directions.

Consider the 𝕊2-valued equivariant energy critical wave maps equation on 1+2 , with equivariance class k 4. It is known that every topologically trivial wave map with energy less than twice that of the unique k-equivariant harmonic map Qk scatters in both time directions. We study maps with precisely the threshold energy = 2(Qk).

In this paper, we give a refined construction of a wave map with threshold energy that converges to a superposition of two harmonic maps (bubbles), asymptotically decoupling in scale. We show that this two-bubble solution possesses H2 regularity. We give a precise dynamical description of the modulation parameters as well as an expansion of the map into profiles. In the next paper in the series, we show that this solution is unique (up to the natural invariances of the equation) relying crucially on the detailed properties of the solution constructed here. Combined with our earlier work (in 2018), we can now give an exact description of every threshold wave map.

wave maps, multisolitons
Mathematical Subject Classification 2010
Primary: 35C08, 35C20, 35L05, 35Q99, 37K40
Received: 23 March 2020
Accepted: 27 October 2020
Published: 12 April 2022
Jacek Jendrej
CNRS and LAGA, Université Sorbonne Paris Nord
Andrew Lawrie
Department of Mathematics
Massachusetts Institute of Technology
Cambridge, MA
United States