On Type I blowup and $\varepsilon$-regularity criteria of suitable weak solutions to the 3D incompressible MHD equations

TL;DR

This paper establishes new interior regularity criteria and Type I blowup conditions for suitable weak solutions to the 3D incompressible MHD equations, extending previous Navier-Stokes results and introducing a unified approach using scaled energy quantities.

Contribution

It extends Type I blowup criteria from Navier-Stokes to MHD equations and develops a unified framework for $ ext{epsilon}$-regularity criteria using scaled energy quantities and mixed Lebesgue norms.

Findings

Finiteness of scaled energy quantities implies Type I blowup.

New $ ext{epsilon}$-regularity criteria based on mixed Lebesgue norms.

Extension of Seregin's Type I criteria to MHD setting.

Abstract

We study interior $\varepsilon$-regularity and Type I blowup criteria for suitable weak solutions to the three-dimensional incompressible MHD equations. Our starting point is a direct iteration scheme for the classical Caffarelli--Kohn--Nirenberg scaled energy quantities $A,E,C$ and $D$, which yields $\varepsilon$-regularity criteria under smallness assumptions on the velocity field $u$ and boundedness assumptions on the magnetic field $b$, with the underlying scaling-invariant quantities chosen independently. As an intermediate step, we prove that finiteness of one such scaling-invariant quantity for each of $u$ and $b$ allows only Type I blowup, in the sense that $A(u,b;r)+E(u,b;r)+C(u,b;r)+D(p;r)<\infty$ for small $r$. This extends Seregin's Type I criteria for the Navier--Stokes equations to the MHD setting and provides a natural point of departure for the analysis of Type II blowup. By interpolation and embedding, we further obtain $\varepsilon$-regularity criteria and Type I characterisations in terms of general scaled mixed Lebesgue norms for $u$ and $b$, with independent exponent choices. While we do not aim to sharpen existing mixed-norm $\varepsilon$-regularity criteria, the present formulation offers a unified and comparatively direct route that is naturally compatible with the Type I framework; in particular, the mixed-norm Type I description does not follow from earlier mixed-norm $\varepsilon$-regularity proofs by a formal replacement of the smallness parameter.