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Earth & Environmental Sciences Preprint PDF DOI

On the instability of some upward propagating, exact, nonlinear mountain waves

Christian Puntini ยท 2026

Using the short-wavelength instability method, we investigate the linear instability of an exact solution describing upward-propagating mountain waves, derived in A. Constantin, \emph{J. Phys. A: Mathโ€ฆ

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Physics Preprint PDF DOI

Finite-time blow-up of two $(1+1)$D systems rigorously derived from the 3D axisymmetric Euler equations

Yaoming Shi ยท 2026

We study two $(1+1)$-dimensional systems, denoted $(R0)$ and $(Z0)$, that are rigorously derived from the three-dimensional axisymmetric Euler equations in a signed polar formulation on the meridian pโ€ฆ

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Mathematics Preprint PDF DOI

Self-similar finite-time blowups with singular profiles of the generalized Constantin-Lax-Majda model: theoretical and numerical investigations

De Huang, Jiajun Tong, Xiuyuan Wang ยท 2026

We investigate novel scenarios of self-similar finite-time blowups of the generalized Constantin-Lax-Majda model with a parameter $a$, which are induced by a new setting where the smooth initial data โ€ฆ

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Mathematics Preprint PDF DOI

Closed-form finite-time blow-up and stability for a $(1+2)$D system (E1) derived from the 2D inviscid Boussinesq equations

Yaoming Shi ยท 2026

In polar variables $(x,\theta)$ on a planar sector, we study a $(1+2)$D system (E1) derived from the two-dimensional inviscid Boussinesq equations. Under a parity/symmetry ansatz on the whole plane (oโ€ฆ

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Mathematics Preprint PDF DOI

Inviscid Limit for Yudovich solution to heat conductive Boussinesq equation on two-dimensional periodic domain

Siran Li ยท 2026

We establish the inviscid limit of the Yudovich solution to the heat conductive Boussinesq equation with initial velocity and temperature/buoyancy in $L^2$ and initial vorticity in $L^\infty$ on the tโ€ฆ

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Mathematics Preprint PDF DOI

Ergodicity for a Constantin-Lax-Majda-DeGregorio model of turbulent flow

Shunsuke Fujita, Reika Fukuizumi, Takashi Sakajo ยท 2026

This paper presents a mathematical analysis of a one-dimensional model of turbulence based on a stochastic generalized Constantin-Lax-Majda-DeGregorio (gCLMG) equation. We focus on the specific case wโ€ฆ

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Mathematics Preprint PDF DOI

Combinatorial Ricci Flows and Hyperbolic Structures on a Class of Compact $3$-Manifolds with Boundary

Xinrong Zhao ยท 2026

In this paper, we study a combinatorial Ricci flow on closed pseudo $3$-manifolds $(M,\mathcal{T})$. We prove that if every edge in the triangulation $\mathcal{T}$ has valence at least $9$, then the cโ€ฆ

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Mathematics Preprint PDF DOI

Sharp nonuniqueness for the forced 2D Navier-Stokes and dissipative SQG equations

Francisco Mengual, Marcos Solera ยท 2026

We prove a sharp nonuniqueness result for the forced generalized SQG equation. First, this yields nonunique $\dot{H}^s$- energy solutions below the Miura-Ju class. In particular, this shows that the sโ€ฆ

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Mathematics Preprint PDF DOI

Galilei and Huygens: Music and science

Athanase Papadopoulos (IRMA) ยท 2025

Vincenzo Galilei and Constantijn Huygens were both humanists and eminent musicians, the former from the late Renaissance and the latter from the early Modern era. Their respective sons, Galileo and Chโ€ฆ

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Mathematics Preprint PDF DOI

Generic regularity and Lipschitz metric for a two-component Novikov system

Kenneth H. Karlsen, Yan Rybalko ยท 2025

We investigate the Cauchy problem for a two-component generalization of the Novikov equation with cubic nonlinearity -- an integrable system whose solutions may develop strong nonlinear phenomena suchโ€ฆ

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Mathematics Preprint PDF DOI

Variational Principle and Stochastic Lagrangian Formulation of Viscous Hydrodynamic Equations

Anna Mazzucato, Anping Pan ยท 2025

In this manuscript, we extend Constantin-Iyer's Lagrangian formulation of Navier-Stokes Equation to a wider class of hydrodynamic models. Moreover, we prove that such Lagrangian formulation is naturalโ€ฆ

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Mathematics Preprint PDF DOI

Remarks on the Spatial Asymptotic Behavior of Solutions to a 1D Model of Equatorial Oceanic Flows

Manuel Fernando Cortez, Oscar Jarrin ยท 2025

We consider a new nonlocal and nonlinear one-dimensional evolution model arising in the study of oceanic flows in equatorial regions, recently derived in [A. Constantin and L. Molinet, Global Existencโ€ฆ

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Mathematics Preprint PDF DOI

A Characterization of Macdonald's Jack Hypergeometric Series ${}_pF_q(x;\alpha)$ and ${}_pF_q(x,y;\alpha)$ via Differential Equations

Hong Chen, Siddhartha Sahi ยท 2025

In a widely circulated manuscript from the 1980s, now available on the arXiv, I.~G.~Macdonald introduced certain multivariable hypergeometric series ${}_pF_q(x)= {}_pF_q(x;\alpha)$ and ${}_pF_q(x,y)= โ€ฆ

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Mathematics Preprint PDF DOI

On anisotropic energy conservation criteria of incompressible fluids

Yanqing Wang, Wei Wei, Yulin Ye ยท 2025

In this paper, by means of divergence-free condition, we establish an anisotropic energy conservation class enabling one component of velocity in the largest space $L^{3} (0,T; B^{1/3}_{3,\infty})$ foโ€ฆ

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Mathematics Preprint PDF DOI

Composition and Volterra type operators on large Bergman spaces with rapidly decreasing weights

M. Almoka, H. Arroussi, J. Virtanen ยท 2025

We characterize boundedness, compactness and Schatten class properties of generalized Volterra-type integral operators acting between large Bergman spaces $A_\omega^p$ and $A_\omega^q$ for $0 <p, q\leโ€ฆ

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Mathematics Preprint PDF DOI

Numerical semigroup tree: type-representation

Jonathan Chappelon, Jorge L. Ramirez Alfonsin, Dumitru I. Stamate ยท 2025

In this paper, we introduce a new depicting of the so-called numerical semigroup tree $\mathcal T$. By exploring computationally this improved picture, relying on the type notion of a semigroup, we foโ€ฆ

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Mathematics Preprint PDF DOI

Stability and Instability on the De Gregorio Modification of the Constantin-Lax-Majda model

Jie Guo, Quansen Jiu ยท 2025

The Constantin-Lax-Majda (CLM) model and the De Gregorio model which is a modification of the CLM model are well-known for their ability to emulate the behavior of the 3D Euler equations, particularlyโ€ฆ

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Physics Preprint PDF DOI

Thermoelectric performance of Ni-Au metallic alloys determined by resonant scattering

Kacper Pryga, Bartlomiej Wiendlocha ยท 2025

This work presents a theoretical study of the electronic structure and transport properties of Ni-Au alloys, recently identified as excellent thermoelectric metals with a power factor significantly exโ€ฆ

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Mathematics Preprint PDF DOI

Two-dimensional water waves with constant vorticity and general bottom topography

S. Pasquali ยท 2025

In this paper we consider two-dimensional water waves with constant vorticity, under the action of gravity and surface tension, in a fluid domain with finite depth and general bottom topography. We prโ€ฆ

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Mathematics Preprint PDF DOI

Existence and analyticity of solutions of nonlinear parabolic model equations with singular data

David Ambrose, Milton Lopes Filho, Helena Nussenzveig Lopes ยท 2025

We explore two approaches to proving existence and analyticity of solutions to nonlinear parabolic differential equations. One of these methods works well for more general nonlinearities, while the seโ€ฆ

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