Non-time-decaying global classical solutions to nonlinear wave equations in 3D under the null condition
Year: 2026
Type: preprint
Abstract: We present an alternative proof of the global well-posedness of nonlinear wave equations in three spatial dimensions under the null condition, in the regularity regime of the classical local existence theory, assuming smallness of the angular derivatives. Unlike previous methods, which rely on decay in time, our approach is based solely on spatial decay. This provides a new perspective on the problem and offers potential applications to the study of Einstein's equations, which we intend to explore in future work.
Source: arXiv (Cornell University)
Authors: Zhang, Zexian, Zhou, Yi
Institution: Fudan University
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Award: G476441113
OpenAlex ID: W7204950958