Now showing items 1-20 of 238

    • 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.Autoridad BCAM; 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.Autoridad BCAM (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.Autoridad BCAM (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.Autoridad BCAM (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.Autoridad BCAM (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 ...
    • Topics in the mathematical design of materials 

      Chen, X.; Fonseca, I.; Ravnik, M.; Slastikov, V.; Zannoni, C.; Zarnescu, A.Autoridad BCAM (2021-01-01)
      We present a perspective on several current research directions relevant to the mathematical design of new materials. We discuss: (i) design problems for phase-transforming and shape-morphing materials, (ii) epitaxy as an ...
    • The Frisch–Parisi formalism for fluctuations of the Schrödinger equation 

      Kumar, S.; Ponce Vanegas, F.Autoridad BCAM; Roncal, L.Autoridad BCAM; Vega, L.Autoridad BCAM (2022)
      We consider the solution of the Schrödinger equation $u$ in $\mathbb{R}$ when the initial datum tends to the Dirac comb. Let $h_{\text{p}, \delta}(t)$ be the fluctuations in time of $\int\lvert x \rvert^{2\delta}\lvert ...
    • On the Schrödinger map for regular helical polygons in the hyperbolic space 

      Kumar, S. (2022-01-01)
      The main purpose of this article is to understand the evolution of X t = X s ∧− X ss , with X(s, 0) a regular polygonal curve with a nonzero torsion in the three-dimensional Minkowski space. Unlike in the case of the ...
    • The Two Dimensional Liquid Crystal Droplet Problem with Tangential Boundary Condition 

      Geng, Z.Autoridad BCAM; Lin, F. (2022-01-18)
      This paper studies a shape optimization problem which reduces to a nonlocal free boundary problem involving perimeter. It is motivated by a study of liquid crystal droplets with a tangential anchoring boundary condition ...
    • Rotational smoothing 

      Caro, P.; Meroño, C.; Parissis, I. (2022-01-05)
      Rotational smoothing is a phenomenon consisting in a gain of regularity by means of averaging over rotations. This phenomenon is present in operators that regularize only in certain directions, in contrast to operators ...
    • Pointwise Convergence of the Schr\"odinger Flow 

      Compaan, E.; Lucà, R.Autoridad BCAM; Staffilani, G. (2021-01)
      In this paper we address the question of the pointwise almost everywhere limit of nonlinear Schr\"odinger flows to the initial data, in both the continuous and the periodic settings. Then we show how, in some cases, certain ...
    • Geometric Harmonic Analysis 

      Canto, J.Autoridad BCAM (2021)
      This thesis is the compilation of the results obtained during my PhD, which started in January 2018 and is being completed in the end of 2021. The main matter is divided into  ve chapters, Chapters 2 6. Each of these ...