Riesz transform and spectral multipliers for the flow Laplacian on nonhomogeneous trees

Autor: Martini, Alessio, Santagati, Federico, Tabacco, Anita, Vallarino, Maria

Let $T$ be a locally finite tree equipped with a flow measure $m$. Let $\mathcal L$ be the flow Laplacian on $(T,m)$. We prove that the first order Riesz transform $\nabla \mathcal L^{-1/2}$ is bounded on $L^p(m)$ for $p\in (1,\infty)$. Moreover, we

Externí odkaz: http://arxiv.org/abs/2310.09113

Flickering returns as RS Oph reestablishes quiescent conditions following its 2021 nova outburst

Autor: Munari, Ulisse, Tabacco, Fulvio

Publikováno v: published as 2022, Res. Notes AAS 6, 103

RS Oph has persistently displayed flickering at optical wavelengths when observed away from its repeating nova outbursts. During the 2006 eruption the flickering disappeared, and this repeated during the recent 2021 event. We have been monitoring RS

Externí odkaz: http://arxiv.org/abs/2205.14363

Riesz transform for a flow Laplacian on homogeneous trees

Autor: Levi, Matteo, Martini, Alessio, Santagati, Federico, Tabacco, Anita, Vallarino, Maria

Publikováno v: Journal of Fourier Analysis and Applications 29, 15 (2023)

We prove the $L^p$-boundedness, for $p \in (1,\infty)$, of the first order Riesz transform associated to the flow Laplacian on a homogeneous tree with the canonical flow measure. This result was previously proved to hold for $p \in (1,2]$ by Hebisch

Externí odkaz: http://arxiv.org/abs/2107.06620

Antarctic Bedmap data: Findable, Accessible, Interoperable, and Reusable (FAIR) sharing of 60 years of ice bed, surface, and thickness data

Autor: A. C. Frémand, P. Fretwell, J. A. Bodart, H. D. Pritchard, A. Aitken, J. L. Bamber, R. Bell, C. Bianchi, R. G. Bingham, D. D. Blankenship, G. Casassa, G. Catania, K. Christianson, H. Conway, H. F. J. Corr, X. Cui, D. Damaske, V. Damm, R. Drews, G. Eagles, O. Eisen, H. Eisermann, F. Ferraccioli, E. Field, R. Forsberg, S. Franke, S. Fujita, Y. Gim, V. Goel, S. P. Gogineni, J. Greenbaum, B. Hills, R. C. A. Hindmarsh, A. O. Hoffman, P. Holmlund, N. Holschuh, J. W. Holt, A. N. Horlings, A. Humbert, R. W. Jacobel, D. Jansen, A. Jenkins, W. Jokat, T. Jordan, E. King, J. Kohler, W. Krabill, M. Kusk Gillespie, K. Langley, J. Lee, G. Leitchenkov, C. Leuschen, B. Luyendyk, J. MacGregor, E. MacKie, K. Matsuoka, M. Morlighem, J. Mouginot, F. O. Nitsche, Y. Nogi, O. A. Nost, J. Paden, F. Pattyn, S. V. Popov, E. Rignot, D. M. Rippin, A. Rivera, J. Roberts, N. Ross, A. Ruppel, D. M. Schroeder, M. J. Siegert, A. M. Smith, D. Steinhage, M. Studinger, B. Sun, I. Tabacco, K. Tinto, S. Urbini, D. Vaughan, B. C. Welch, D. S. Wilson, D. A. Young, A. Zirizzotti

Publikováno v: Earth System Science Data, Vol 15, Pp 2695-2710 (2023)

One of the key components of this research has been the mapping of Antarctic bed topography and ice thickness parameters that are crucial for modelling ice flow and hence for predicting future ice loss and the ensuing sea level rise. Supported by the

Externí odkaz: https://doaj.org/article/dd829658db4441f6ba419561af31ff15

BMO spaces on weighted homogeneous trees

Autor: Arditti, Laura, Tabacco, Anita, Vallarino, Maria

We consider an infinite homogeneous tree $\mathcal V$ endowed with the usual metric $d$ defined on graphs and a weighted measure $\mu$. The metric measure space $(\mathcal V,d,\mu)$ is nondoubling and of exponential growth, hence the classical theory

Externí odkaz: http://arxiv.org/abs/2006.02693