• Notes on $H^{\log}$: structural properties, dyadic variants, and bilinear $H^1$-$BMO$ mappings 

  Bakas, O.; Pott, S.; Rodríguez-López, S.; Sola, A. (2022)

  This article is devoted to a study of the Hardy space $H^{\log} (\mathbb{R}^d)$ introduced by Bonami, Grellier, and Ky. We present an alternative approach to their result relating the product of a function in the real Hardy ...

• Polynomial averages and pointwise ergodic theorems on nilpotent groups 

  Ionescu, A. D.; Magyar, A.; Mirek, M.; Szarek, T.Z. (2022)

  We establish pointwise almost everywhere convergence for ergodic averages along polynomial sequences in nilpotent groups of step two of measure-preserving transformations on $\sigma$-finite measure spaces. We also establish ...

• On the Calderón problem for nonlocal Schrödinger equations with homogeneous, directionally antilocal principal symbols 

  Covi, G.; García-Ferrero, M.A.; Rüland, A. (2022-12-25)

  In this article we consider direct and inverse problems for α-stable, elliptic nonlocal operators whose kernels are possibly only supported on cones and which satisfy the structural condition of directional antilocality ...

• Kato–Ponce estimates for fractional sublaplacians in the Heisenberg group 

  Fanelli, L.; Roncal, L. (2022-11-04)

  We give a proof of commutator estimates for fractional powers of the sublaplacian on the Heisenberg group. Our approach is based on pointwise and $L^p$ estimates involving square fractional integrals and Littlewood--Paley ...

• Various results concerning homogenisation of nematic liquid crystals 

  Ceuca, R.D. (2022-10-17)

  In this thesis we present various results concerning homogenisation of nematic liquid crystals: two of them are in perforated domains, while the other one concerns rates of convergence for boundary homogenisation. The first ...

• Motion of a rigid body in a compressible fluid with Navier-slip boundary condition 

  Necasova, S.; Ramaswamy, M.; Roy, A.; Schlömerkemper, A. (2022-11-25)

  In this work, we study the motion of a rigid body in a bounded domain which is filled with a compressible isentropic fluid. We consider the Navier-slip boundary condition at the interface as well as at the boundary of the ...

• Sharp local smoothing estimates for Fourier integral operators 

  Beltran D.; Hickman J.; Sogge C.D. (2019)

  The theory of Fourier integral operators is surveyed, with an emphasis on local smoothing estimates and their applications. After reviewing the classical background, we describe some recent work of the authors which ...

• A∞ condition for general bases revisited: complete classification of definitions 

  Kosz, D. (2022-05-27)

  We refer to the discussion on different characterizations of the A∞ class of weights, initiated by Duoandikoetxea, Martín-Reyes, and Ombrosi [Math. Z. 282 (2016), pp. 955–972]. Twelve definitions of the A∞ condition ...

• Corrigendum to: An extension problem and trace Hardy inequality for the sublaplacian on H-type groups 

  Roncal, L.; Thangavelu, S. (2021-03-10)

  Recently we have found a couple of errors in our paper entitled An extension problem and trace Hardy inequality for the sub-Laplacian on $H$-type groups, Int. Math. Res. Not. IMRN (2020), no. 14, 4238--4294. They concern ...

• ENERGY CONSERVATION FOR 2D EULER WITH VORTICITY IN L(log L)α* 

  Ciampa, G. (2022-01-01)

  In these notes we discuss the conservation of the energy for weak solutions of the twodimensional incompressible Euler equations. Weak solutions with vorticity in (Formula presented) with p > 3/2 are always conservative, ...

• Existence of a weak solution to a nonlinear fluid-structure interaction problem with heat exchange 

  Mácha, V.; Muha, B.; Nečasová, S.; Roy, A.; Trifunović, S. (2022-01-01)

  In this paper, we study a nonlinear interaction problem between a thermoelastic shell and a heat-conducting fluid. The shell is governed by linear thermoelasticity equations and encompasses a time-dependent domain which ...

• Maximal operators on the infinite-dimensional torus 

  Roncal, Luz; Kosz, D.; Martínez-Perales, J.; Paternostro, V.; Rela, E.; Roncal, L. (2022-03-31)

  We study maximal operators related to bases on the infinite-dimensional torus $\tom$. {For the normalized Haar measure $dx$ on $\mathbb{T}^\omega$ it is known that $M^{\mathcal{R}_0}$, the maximal operator associated with ...

• Entire vortex solutions of negative degree for the anisotropic Ginzburg-Landau system 

  Kowalczyk, M.; Lamy, X.; Smyrnelis, P.A. (2022)

  The anisotropic Ginzburg-Landau system $\Delta u+\delta \nabla (div u) +\delta curl^*(curl u)=(|u|^2-1) u$, for $u\colon\mathbb R^2\to\mathbb R^2$ and $\delta\in (-1,1)$, models the formation of vortices in liquid crystals. ...

• Cubic microlattices embedded in nematic liquid crystals: A Landau-de Gennes study 

  Ceuca, R.D. (2021-01-01)

  We consider a Landau-de Gennes model for a connected cubic lattice scaffold in a nematic host, in a dilute regime. We analyse the homogenised limit for both cases in which the lattice of embedded particles presents or not ...

• On the Hausdorff dimension of Riemann's non-differentiable function 

  Eceizabarrena, D. (2021-01-01)

  Recent findings show that the classical Riemann's non-differentiable function has a physical and geometric nature as the irregular trajectory of a polygonal vortex filament driven by the binormal flow. In this article, we ...

• A pseudospectral method for the one-dimensional fractional Laplacian on R 

  Cayama, J.; Cuesta, C.M.; De la Hoz, F. (2021-01-15)

  In this paper, we propose a novel pseudospectral method to approximate accurately and efficiently the fractional Laplacian without using truncation. More precisely, given a bounded regular function defined over R, we map ...

• Discrepancy of Minimal Riesz Energy Points 

  Marzo, J.; Mas, A. (2021-12-01)

  We find upper bounds for the spherical cap discrepancy of the set of minimizers of the Riesz s-energy on the sphere Sd. Our results are based on bounds for a Sobolev discrepancy introduced by Thomas Wolff in an unpublished ...

• Self-adjointness of two-dimensional Dirac operators on corner domains 

  Pizzichillo, F.; Van Den Bosch, H. (2021-01-01)

  We investigate the self-adjointness of the two-dimensional Dirac operator D, with quantum-dot and Lorentz-scalar i-shell boundary conditions, on piecewise C2 domains (with finitely many corners). For both models, we prove ...

• Dirac Operators and Shell Interactions: A Survey 

  Ourmières-Bonafos, T.; Pizzichillo, F. (2021-01-01)

  In this survey we gather recent results on Dirac operators coupled with δ-shell interactions. We start by discussing recent advances regarding the question of self-adjointness for these operators. Afterwards we switch to ...

• On the regularity of solutions to the k-generalized korteweg-de vries equation 

  Kenig, C. E.; Linares, F.; Ponce, G.; Vega, L. (2018-01-01)

  This work is concerned with special regularity properties of solutions to the k-generalized Korteweg-de Vries equation. In [Comm. Partial Differential Equations 40 (2015), 1336–1364] it was established that if the initial ...

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