Nontangential Maximal Function estimates for the elliptic Mixed Boundary Value Problem with variable coefficients

This paper establishes nontangential maximal function estimates for the gradient of solutions to elliptic operators with variable, bounded, measurable coefficients on Lipschitz domains, addressing a mixed boundary value problem with LpL^p Neumann and W1,pW^{1,p} Dirichlet-regularity data that generalizes both pure boundary problems and the classical Laplacian case.

Hongjie Dong, Martin UlmerThu, 12 Ma🔢 math

Incompressible Euler Blowup at the C1,13C^{1,\frac{1}{3}} Threshold

This paper establishes the sharp finite-time Type-I blowup for the three-dimensional incompressible Euler equations in the axisymmetric no-swirl class with initial velocity in C1,αC^{1,\alpha} for every α(0,13)\alpha \in (0, \frac{1}{3}), utilizing a novel Lagrangian framework to prove that the quadratic strain term dominates the pressure Hessian uniformly below the critical regularity threshold of 13\frac{1}{3}.

Steve ShkollerThu, 12 Ma🔢 math

Long-time dynamics of a bulk-surface convective Cahn--Hilliard system: Pullback attractors and convergence to equilibrium

This paper investigates the long-time dynamics of a bulk-surface convective Cahn--Hilliard system by establishing instantaneous regularization, proving the existence of a minimal pullback attractor for the resulting non-autonomous system, and demonstrating convergence to a single steady state under decay assumptions on the velocity fields using the Łojasiewicz–Simon inequality.

Patrik Knopf, Andrea Poiatti, Jonas Stange, Sema YaylaThu, 12 Ma🔢 math

On the global well-posedness and self-similar solutions for a nonlinear elliptic problem with a dynamic boundary condition

This paper establishes the global well-posedness and constructs self-similar solutions for a semilinear elliptic equation with a nonlinear dynamic boundary condition in the half-space by utilizing the broader framework of Morrey spaces to accommodate rough, non-decaying initial data and deriving key estimates for associated interior and boundary operators.

Lucas C. F. Ferreira, Narayan V. Machaca-LeónThu, 12 Ma🔢 math

Near Field Refraction Problem With Loss of Energy in Negative Refractive Index Material

This paper investigates the near-field refraction problem in negative refractive index materials with energy loss by analyzing two distinct relative refractive index regimes, defining the refractor, examining Fresnel coefficients, and proving the existence of weak solutions for discrete or finite Radon target measures, while also briefly addressing the critical case where the index equals -1.

Feida Jiang, Haokun SuiThu, 12 Ma🔢 math

Shape-Design Approximation for a Class of Degenerate Hyperbolic Equations with a Degenerate Boundary Point and Its Application to Observability

This paper establishes the well-posedness and regularity of a class of degenerate hyperbolic equations with a boundary degeneracy, introduces a shape-design approximation via domain regularization to prove solution convergence, and derives an observability inequality for the original degenerate system by leveraging uniform observability results from the regularized problems.

Dong-Hui Yang, Jie ZhongThu, 12 Ma🔢 math

Supersonic flow of a Chaplygin gas past a conical wing with Λ\Lambda-shaped cross sections

This paper establishes the existence of piecewise smooth self-similar solutions for the supersonic flow of a Chaplygin gas over a conical wing with Λ\Lambda-shaped cross sections by reformulating the problem as a boundary value problem for a nonlinear mixed-type equation and applying the continuity method, thereby verifying part of Küchemann's speculation and identifying a new conical flow field structure.

Minghong Han, Bingsong Long, Hairong YuanThu, 12 Ma🔢 math