Mapping properties of the local Schr\" odinger maximal function with radial initial data on Damek-Ricci spaces

U Dewan, SK Ray - arXiv preprint arXiv:2411.04084, 2024 - arxiv.org
Let $\Delta $ be the Laplace-Beltrami operator on a Damek-Ricci space $ S $ corresponding
to the left-invariant Riemannian metric, with its $ L^ 2$-spectrum being the half line $(-\infty …

Regularity and pointwise convergence of solutions of the Schrödinger operator with radial initial data on Damek-Ricci spaces

U Dewan - Annali di Matematica Pura ed Applicata (1923-), 2024 - Springer
One of the most celebrated problems in Euclidean Harmonic analysis is the Carleson's
problem: determining the optimal regularity of the initial condition f of the Schrödinger …

An extension problem and Hardy's inequality for the fractional Laplace-Beltrami operator on Riemannian symmetric spaces of noncompact type

M Bhowmik, S Pusti - Journal of Functional Analysis, 2022 - Elsevier
In this paper we study an extension problem for the Laplace-Beltrami operator on
Riemannian symmetric spaces of noncompact type and use the solution to prove Hardy-type …

Characterization of almost 𝐿^{𝑝}-eigenfunctions of the Laplace-Beltrami operator

P Kumar, S Ray, R Sarkar - Transactions of the American mathematical …, 2014 - ams.org
In 1980, Roe proved that if a doubly-infinite sequence $\{f_k\} $ of functions on $\mathbb {R}
$ satisfies $ f_ {k+ 1}=(df_ {k}/dx) $ and $| f_ {k}(x)|\leq M $ for all $ k= 0,\pm 1,\pm 2,\cdots …

Lipschitz Conditions in Damek–Ricci Spaces

S El Ouadih, R Daher - Comptes …, 2021 - comptes-rendus.academie-sciences …
In this paper we extend classical Titchmarsh theorems on the Fourier–Helgason transform of
Lipschitz functions to the setting of Lp-space on Damek–Ricci spaces. As consequences …

Growth properties of the Fourier transform

WO Bray, MA Pinsky - Filomat, 2012 - JSTOR
In a recent paper by the authors, growth properties of the Fourier transform on Euclidean
space and the Helgason Fourier transform on rank one symmetric spaces of non-compact …

[HTML][HTML] Fourier restriction theorem and characterization of weak L2 eigenfunctions of the Laplace–Beltrami operator

P Kumar - Journal of Functional Analysis, 2014 - Elsevier
In this paper we prove that for λ∈ R∖{0} the Poisson transform P λ F of F∈ L 2 (K/M)
belongs to L 2,∞(G/K). This complements an earlier result of Lohoué and Rychener. Using …

The role of restriction theorems in harmonic analysis on harmonic NA groups

P Kumar, SK Ray, RP Sarkar - Journal of Functional Analysis, 2010 - Elsevier
We shall obtain inequalities for Fourier transform via moduli of continuity on NA groups.
These results in particular settle the conjecture posed in a recent paper by WO Bray and M …

Chaotic dynamics of the heat semigroup on the Damek-Ricci spaces

RP Sarkar - Israel Journal of Mathematics, 2013 - Springer
We consider the rank one Riemannian symmetric spaces of noncompact type and their non-
symmetric generalization, namely the Damek-Ricci spaces. We show that the heat …

Dynamics of the heat semigroup in Jacobi analysis

F Astengo, B Di Blasio - Journal of Mathematical Analysis and Applications, 2012 - Elsevier
Dynamics of the heat semigroup in Jacobi analysis Page 1 J. Math. Anal. Appl. 391 (2012)
48–56 Contents lists available at SciVerse ScienceDirect Journal of Mathematical Analysis and …