David Alonso-Gutiérrez, Jesús Bastero's Approaching the Kannan-Lovász-Simonovits and Variance PDF

By David Alonso-Gutiérrez, Jesús Bastero

ISBN-10: 3319132628

ISBN-13: 9783319132624

ISBN-10: 3319132636

ISBN-13: 9783319132631

Focusing on crucial conjectures of Asymptotic Geometric research, the Kannan-Lovász-Simonovits spectral hole conjecture and the variance conjecture, those Lecture Notes current the speculation in an obtainable approach, in order that readers, even people who find themselves no longer specialists within the box, should be capable of take pleasure in the taken care of issues. delivering a presentation appropriate for pros with little history in research, geometry or chance, the paintings is going on to the relationship among isoperimetric-type inequalities and sensible inequalities, giving the reader swift entry to the center of those conjectures.

In addition, 4 contemporary and critical ends up in this conception are awarded in a compelling manner. the 1st are theorems because of Eldan-Klartag and Ball-Nguyen, referring to the variance and the KLS conjectures, respectively, to the hyperplane conjecture. subsequent, the most rules wanted end up the simplest recognized estimate for the thin-shell width given via Guédon-Milman and an method of Eldan's paintings at the connection among the thin-shell width and the KLS conjecture are detailed.

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9 Let 0 Ä p Ä p 0 Ä 1 and 0 Ä q Ä q 0 Ä 1, such that 1 p 1 1 D 0 q p 1 : q0 28 1 The Conjectures Then, Dp;q Ä Cp0 Dp0 ;q 0 ; where C > 0 is an absolute constant. E. Milman proved a breakthrough showing that, under convexity assumptions, for instance log-concave probabilities, we can reverse the inequalities Dp;q Ä CD1;1 for all 1 Ä p Ä q Ä 1. In order to prove this fact we will introduce the semigroup technique, previously used by Ledoux. x/ dx is a log-concave probability with V smooth (an approximation argument to deduce the result without any smoothness assumption can be seen in [49]).

P Cp : Ä n 1C p p 1. 2 were true we would have optimal reverse Hölder inequalities for the moments and concentration of the mass around a thin shell. 7 The Variance Conjecture This section is devoted to the introduction of the variance conjecture. We compare it with the thin-shell width related with the central limit problem for isotropic convex bodies. Next, we consider linear deformations of an isotropic probability measure and we give a random result for the variance conjecture when some extra conditions are satisfied.

Milman on the role of convexity, where he proved the equivalence among all Poincaré-type inequalities for all values of p. In particular Cheeger’s isoperimetric inequality, Poincaré’s inequality, the exponential concentration inequality and the first-moment concentration inequality are equivalent with the same constants, up to absolute factors. In Poincaré’s inequality we can consider different exponents, Dp;q kf E f kp Ä k jrf j kq for functions f 2 F , whenever p Ä q (by Jensen). Dp;q is the best constant verifying the inequality above for all the functions f 2 F .

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Approaching the Kannan-Lovász-Simonovits and Variance Conjectures by David Alonso-Gutiérrez, Jesús Bastero

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