We prove that peak shaped eigenfunctions of the one-dimensional uncentered Hardy-Littlewood maximal operator are symmetric and homogeneous. This implies that the norms of the maximal operator on L(p) spaces are not attained.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm118-2-2, author = {Leonardo Colzani and Javier P\'erez L\'azaro}, title = {Eigenfunctions of the Hardy-Littlewood maximal operator}, journal = {Colloquium Mathematicae}, volume = {120}, year = {2010}, pages = {379-389}, zbl = {1196.42017}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm118-2-2} }
Leonardo Colzani; Javier Pérez Lázaro. Eigenfunctions of the Hardy-Littlewood maximal operator. Colloquium Mathematicae, Tome 120 (2010) pp. 379-389. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm118-2-2/