Poincare and Sobolev inequalities in the Monge-Ampere quasi-metric structure

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dc.contributor.author Ranabhat, Min Bahadur
dc.date.accessioned 2020-08-07T14:21:33Z
dc.date.available 2020-08-07T14:21:33Z
dc.date.issued 2020-08-01
dc.identifier.uri https://hdl.handle.net/2097/40787
dc.description.abstract In the first half of the 20th century, the initial study of so-called the Sobolev type inequalities was motivated by the question- Can one control the size of a function by the size of its gradient in the higher dimensional Euclidean space? Later in the second half, the Sobolev type inequalities found applications in proving some embedding theorems associated with the Sobolev space, and then to study the local behavior of solutions of certain elliptic partial differential equations, such as to prove the Harnack inequalities and the Holder’s continuity. The Poincare type inequalities were also studied together due to the similar phenomena and applications as of the Sobolev type inequalities. At the earlier developmental stage, the Sobolev and Poincare inequalities were established associated to the metric balls, more precisely to the Euclidean balls. The richness of applications of these inequalities in metric spaces motivated mathematicians to investigate such inequalities in various complicated geometrical structures. One of such geometrical structures is the space of homogeneous type, that is, the quasi-metric space equipped with the doubling measure. The Poincare and Sobolev type inequalities in the quasi-metric spaces are studied deeply throughout the first two decades of this 21st century. In 2008, G. Tian and X.J. Wang investigated Sobolev inequalities in a space of homogeneous type so-called the Monge-Ampere quasi-metric structure, for the first time, based on the geometry of the Monge-Ampere sections studied by Caffarelli and Gutierrez in 1990s. Later in 2014, D. Maldonado developed Poincare inequalities under the minimal assumptions in the Monge-Ampere quasi-metric structure. In this dissertation we first focus on improving the known Poincare inequalities in the Monge-Ampere quasi-metric structure by weakening the hypotheses, for instance with cheaper assumptions on the Monge-Ampere measure, and then develop new such inequalities by imposing some stronger conditions on the Monge-Ampere measure. Finally, we present the application of these Poincare inequalities in establishing the corresponding Sobolev inequalities. The proofs of both Poincare and Sobolev inequalities developed earlier in the Monge- Ampere quasi-metric structure involve the Green’s functions. We use a completely different approach to establish such inequalities, which is proudly a novelty of our work. Towards the end of this dissertation we study the geometry of the Monge-Ampere sections in the form of the Whitney decomposition. en_US
dc.language.iso en_US en_US
dc.subject Monge-Ampere sections en_US
dc.subject Poincare and Sobolev inequalities en_US
dc.title Poincare and Sobolev inequalities in the Monge-Ampere quasi-metric structure en_US
dc.type Dissertation en_US
dc.description.degree Doctor of Philosophy en_US
dc.description.level Doctoral en_US
dc.description.department Department of Mathematics en_US
dc.description.advisor Diego M. Maldonado en_US
dc.date.published 2020 en_US
dc.date.graduationmonth August en_US

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