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Affine isoperimetric inequalities on flag manifolds
Part of:
General convexity
Published online by Cambridge University Press: 19 December 2023
Abstract
Building on work of Furstenberg and Tzkoni, we introduce 
$\mathbf {r}$-flag affine quermassintegrals and their dual versions. These quantities generalize affine and dual affine quermassintegrals as averages on flag manifolds (where the Grassmannian can be considered as a special case). We establish affine and linear invariance properties and extend fundamental results to this new setting. In particular, we prove several affine isoperimetric inequalities from convex geometry and their approximate reverse forms. We also introduce functional forms of these quantities and establish corresponding inequalities.
Keywords
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- © The Author(s), 2023. Published by Cambridge University Press on behalf of The Canadian Mathematical Society
Footnotes
Susanna Dann was supported by the FAPA funds from Vicerrectoría de Investigaciones de la Universidad de los Andes (INV-2019-63-1699). Grigoris Paouris was supported by Simons Foundation Collaboration Grant #527498 and NSF grant DMS-1812240. Peter Pivovarov was supported by NSF grant DMS-1612936.
References
Artstein-Avidan, S., Klartag, B., and Milman, V.,
The Santaló point of a function, and a functional form of the Santaló inequality
. Mathematika 51(2004), nos. 1–2, 33–48.CrossRefGoogle Scholar
Artstein-Avidan, S., Klartag, B., Schütt, C., and Werner, E.,
Functional affine-isoperimetry and an inverse logarithmic Sobolev inequality
. J. Funct. Anal. 262(2012), no. 9, 4181–4204.CrossRefGoogle Scholar
Ball, K. M.,
Logarithmically concave functions and sections of convex sets in
${\mathbb{R}}^n$
. Stud. Math. 88(1988), 69–84.CrossRefGoogle Scholar
${\mathbb{R}}^n$
. Stud. Math. 88(1988), 69–84.CrossRefGoogle ScholarBobkov, S. G., Colesanti, A., and Fragalá, I.,
Quermassintegrals of quasi-concave functions and generalized Prékopa–Leindler inequalities
. Manuscripta Math. 143(2014), nos. 1–2, 131–169.CrossRefGoogle Scholar
Bourgain, J. and Milman, V. D.,
New volume ratio properties for convex symmetric bodies in
${\mathbb{R}}^n$
. Invent. Math. 88(1987), no. 2, 319–340.CrossRefGoogle Scholar
${\mathbb{R}}^n$
. Invent. Math. 88(1987), no. 2, 319–340.CrossRefGoogle ScholarBrazitikos, S., Giannopoulos, A., Valettas, P., and Vritsiou, B. H., Geometry of isotropic convex bodies, Mathematical Surveys and Monographs, 196, American Mathematical Society, Providence, RI, 2014.Google Scholar
Bürgisser, P. and Lerario, A.,
Probabilistic Schubert calculus
. J. Reine Angew. Math. 760(2020), 1–58.CrossRefGoogle Scholar
Busemann, H.,
Volume in terms of concurrent cross-sections
. Pacific J. Math. 3(1953), 1–12.CrossRefGoogle Scholar
Busemann, H. and Straus, E. G.,
Area and normality
. Pacific J. Math. 10(1960), 35–72.CrossRefGoogle Scholar
Cordero-Erausquin, D., Fradelizi, M., Paouris, G., and Pivovarov, P.,
Volume of the polar of random sets and shadow systems
. Math. Ann. 362(2015), nos. 3–4, 1305–1325.CrossRefGoogle Scholar
Dafnis, N. and Paouris, G.,
Estimates for the affine and dual affine quermassintegrals of convex bodies
. Ill. J. Math. 56(2012), no. 4, 1005–1021.Google Scholar
Dann, S., Paouris, G., and Pivovarov, P.,
Bounding marginal densities via affine isoperimetry
. Proc. Lond. Math. Soc. 113(2016), 140–162.CrossRefGoogle Scholar
Figiel, T. and Tomczak-Jaegermann, N.,
Projections onto Hilbertian subspaces of Banach spaces
. Israel J. Math. 33(1979), 155–171.CrossRefGoogle Scholar
Fradelizi, M. and Meyer, M.,
Some functional forms of Blaschke–Santaló inequality
. Math. Z. 256(2007), no. 2, 379–395.CrossRefGoogle Scholar
Furstenberg, H. and Keston, H.,
Products of random matrices
. Ann. Math. Statist. 31(1960), 457–469.CrossRefGoogle Scholar
Furstenberg, H. and Tzkoni, I.,
Spherical functions and integral geometry
. Israel J. Math. 10(1971), 327–338.CrossRefGoogle Scholar
Gardner, R. J., Geometric tomography, 2nd ed., Cambridge University Press, New York, 2006.Google Scholar
Gardner, R. J.,
The dual Brunn–Minkowski theory for bounded Borel sets: dual affine quermassintegrals and inequalities
. Adv. Math. 216(2007), no. 1, 358–386.CrossRefGoogle Scholar
Giannopoulos, A., Paouris, G., and Vritsiou, B. H.,
The isotropic position and the reverse Santaló inequality
. Israel J. Math. 203(2014), no. 1, 1–22.CrossRefGoogle Scholar
Grinberg, E. L.,
Isoperimetric inequalities and identities for k-dimensional cross-sections of convex bodies
. Math. Ann. 291(1991), no. 1, 75–86.CrossRefGoogle Scholar
Hanin, B. and Paouris, G.,
Non-asymptotic results for singular values of Gaussian matrix products
. Geom. Funct. Anal. 31(2021), no. 2, 268–324.CrossRefGoogle Scholar
Huang, Y., Lutwak, E., Yang, D., and Zhang, G.,
Geometric measures in the dual Brunn–Minkowski theory and their associated Minkowski problems
. Acta Math. 216(2016), no. 2, 325–388.CrossRefGoogle Scholar
Hug, D., Rataj, J., and Weil, W.,
Flag representations of mixed volumes and mixed functionals of convex bodies
. J. Math. Anal. Appl. 460(2018), no. 2, 745–776.CrossRefGoogle Scholar
Klartag, B.,
On convex perturbations with a bounded isotropic constant
. Geom. Funct. Anal. 16(2006), no. 6, 1274–1290.CrossRefGoogle Scholar
Klartag, B. and Milman, V.,
Geometry of
$\mathit{log}$
-concave functions and measures
. Geom. Dedicata. 112(2005), no. 1, 169–182.CrossRefGoogle Scholar
$\mathit{log}$
-concave functions and measures
. Geom. Dedicata. 112(2005), no. 1, 169–182.CrossRefGoogle ScholarKuperberg, G.,
From the Mahler conjecture to gauss linking integrals
. Geom. Funct. Anal. 18(2008), no. 3, 870–892.CrossRefGoogle Scholar
Lehec, J.,
The symmetric property (
$\tau$
) for the Gaussian measure
. Ann. Fac. Sci. Toulouse Math. (6) 17(2008), no. 2, 357–370.CrossRefGoogle Scholar
$\tau$
) for the Gaussian measure
. Ann. Fac. Sci. Toulouse Math. (6) 17(2008), no. 2, 357–370.CrossRefGoogle ScholarLewis, D. R.,
Ellipsoids defined by Banach ideal norms
. Mathematika 26(1979), 18–29.CrossRefGoogle Scholar
Lutwak, E.,
A general isepiphanic inequality
. Proc. Amer. Math. Soc. 90(1984), no. 3, 415–421.CrossRefGoogle Scholar
Lutwak, E.,
Intersection bodies and dual mixed volumes
. Adv. Math. 71(1988), no. 2, 232–261.CrossRefGoogle Scholar
Lutwak, E.,
Inequalities for Hadwiger’s harmonic quermassintegrals
. Math. Ann. 280(1988), no. 1, 165–175.CrossRefGoogle Scholar
Lutwak, E.,
Selected affine isoperimetric inequalities
. In: Handbook of convex geometry, Vols. A and B, North-Holland, Amsterdam, 1993, pp. 151–176.CrossRefGoogle Scholar
Lutwak, E., Yang, D., and Zhang, G.,
${L}_p$
affine isoperimetric inequalities
. J. Differ. Geom. 56(2000), no. 1, 111–132.CrossRefGoogle Scholar
${L}_p$
affine isoperimetric inequalities
. J. Differ. Geom. 56(2000), no. 1, 111–132.CrossRefGoogle ScholarLutwak, E., Yang, D., and Zhang, G.,
Sharp affine
${L}_p$
-Sobolev inequalities
. J. Differ. Geom. 62(2002), 17–38.CrossRefGoogle Scholar
${L}_p$
-Sobolev inequalities
. J. Differ. Geom. 62(2002), 17–38.CrossRefGoogle ScholarLutwak, E. and Zhang, G.,
Blaschke–Santaló inequalities
. J. Differ. Geom. 47(1997), no. 1, 1–16.CrossRefGoogle Scholar
Milman, E. and Yehudayoff, A.,
Sharp isoperimetric inequalities for affine quermassintegrals
. J. Amer. Math. Soc. 36(2023), no. 4, 1061–1101.Google Scholar
Milman, V. and Rotem, L.,
Mixed integrals and related inequalities
. J. Funct. Anal. 264(2013), no. 2, 570–604.CrossRefGoogle Scholar
Milman, V. D.,
Isomorphic symmetrization and geometric inequalities
. In: Geometric aspects of functional analysis (1986/87), Lecture Notes in Mathematics, 1317, Springer, Berlin, 1988, pp. 107–131.CrossRefGoogle Scholar
Nazarov, F.,
The Hörmander proof of the Bourgain–Milman theorem
. In: Geometric aspects of functional analysis, Lecture Notes in Mathematics, 2050, Springer, Heidelberg, 2012, pp. 335–343.CrossRefGoogle Scholar
Paouris, G. and Pivovarov, P.,
Small-ball probabilities for the volume of random convex sets
. Discrete Comput. Geom. 49(2013), no. 3, 601–646.CrossRefGoogle Scholar
Paouris, G. and Valettas, P.,
Neighborhoods on the Grassmannian of marginals with bounded isotropic constant
. J. Funct. Anal. 267(2014), no. 9, 3427–3443.CrossRefGoogle Scholar
Petty, C. M.,
Isoperimetric problems
. In: Proceedings of the conference on convexity and combinatorial geometry (Univ. Oklahoma, Norman, Okla., 1971), Department of Mathematics, The University of Oklahoma, Norman, OH, 1971, pp. 26–41.Google Scholar
Pisier, G.,
Holomorphic semi-groups and the geometry of Banach spaces
. Ann. of Math. 115(1982), 375–392.CrossRefGoogle Scholar
Pisier, G., The volume of convex bodies and Banach space geometry, Cambridge Tracts in Mathematics, 94, Cambridge University Press, Cambridge, 1989.Google Scholar
Rogers, C. A. and Shephard, G.,
The difference body of a convex body
. Arch. Math. 8(1957), 220–233.CrossRefGoogle Scholar
Santaló, L. A.,
An affine invariant for convex bodies of
$n$
-dimensional space
. Portugaliae Math. 8(1949), 155–161.Google Scholar
$n$
-dimensional space
. Portugaliae Math. 8(1949), 155–161.Google ScholarSchneider, R., Convex bodies: the Brunn–Minkowski theory, second expanded ed., Encyclopedia of Mathematics and Its Applications, 151, Cambridge University Press, Cambridge, 2014.Google Scholar
Schneider, R. and Weil, W.,
Zonoids and related topics
. In: Convexity and its applications, Birkhäuser, Basel, 1983, pp. 296–317.CrossRefGoogle Scholar
Schneider, R. and Weil, W., Stochastic and integral geometry, probability and its applications (New York), Springer, Berlin, 2008.Google Scholar
Tomczak-Jaegermann, N., Banach–Mazur distances and finite-dimensional operator ideals, Pitman Monographs and Surveys in Pure and Applied Mathematics, 38, Longman Scientific & Technical, Harlow, 1989.Google Scholar
Zhang, G., The affine Sobolev inequality. J. Differ. Geom. 53(1999), no. 1, 183–202.CrossRefGoogle Scholar