Martingale inequalities and operator space structures on $L_p$
Documenta mathematica, Tome 19 (2014), pp. 1367-1442
We describe a new operator space structure on Lp when p is an even integer and compare it with the one introduced in our previous work using complex interpolation. For the new structure, the Khintchine inequalities and Burkholder's martingale inequalities have a very natural form span of the Rademacher functions is completely isomorphic to the operator Hilbert space OH, and the square function of a martingale difference sequence dn is Σdn⊗dˉn. Various inequalities from harmonic analysis are also considered in the same operator valued framework. Moreover, the new operator space structure also makes sense for non-commutative Lp-spaces associated to a trace with analogous results. When p→∞ and the trace is normalized, this gives us a tool to study the correspondence E↦E defined as follows: if E⊂B(H) is a completely isometric emdedding then E is defined so that E⊂CB(OH) is also one.
@article{10_4171_dm_483,
author = {Gilles Pisier},
title = {Martingale inequalities and operator space structures on $L_p$},
journal = {Documenta mathematica},
pages = {1367--1442},
year = {2014},
volume = {19},
doi = {10.4171/dm/483},
url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/483/}
}
Gilles Pisier. Martingale inequalities and operator space structures on $L_p$. Documenta mathematica, Tome 19 (2014), pp. 1367-1442. doi: 10.4171/dm/483
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