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High Dimensional Expanders in Analysis and Computation
High Dimensional Expanders in Analysis and Computation
High Dimensional Expanders in Analysis and Computation

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151946
ISBN  
9798383243923
DDC  
004
저자명  
Hopkins, Nathaniel Max Klevit.
서명/저자  
High Dimensional Expanders in Analysis and Computation
발행사항  
[Sl] : University of California, San Diego, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
820 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
주기사항  
Advisor: Kane, Daniel;Lovett, Shachar.
학위논문주기  
Thesis (Ph.D.)--University of California, San Diego, 2024.
초록/해제  
요약High dimensional expanders (HDX) are a nascent generalization of expander graphs (sparse yet robustly connected networks that play a core role in the theory of computation) to high dimensional domains. Despite recent breakthrough use in sampling and local testability, relatively little is known about HDX, their properties, and their broader position in theoretical computer science. In this dissertation, we develop the role of high dimensional expanders in computation through the interplay of Boolean analysis, concentration of measure, approximation algorithms, and hardness of approximation.In the first half of this dissertation, we develop a robust theory of Fourier and probabilistic analysis on HDX. This includes generalizations of standard tools of theoretical computer science such as the Fourier decomposition, hypercontractivity, and Chernoff bounds, as well as more application-focused techniques such as symmetrization, reverse hypercontractivity, and concentration of high degree functions. In many cases, our results give the first sparse domains satisfying such notions, a critical consideration in application where density or 'degree' controls the cost associated with their use.In the second half of this dissertation, we give applications of these ideas to algorithms, complexity, and mathematics. Algorithmically, we show the local structure of high dimensional expanders can be exploited to build fast approximation algorithms for unique games, and explore implications of fast approximate sampling algorithms on HDX to massive multiplayer matrix games. In mathematics, we show high dimensional expanders have optimal geometric overlap, extend a variant of the Frankl-Rodl theorem to HDX, and prove new degree lower bounds for certain HDX. Finally in complexity we leverage new topological HDX to construct optimally hard explicit constraint satisfaction problems for Sum-of-Squares (a powerful optimization paradigm), and prove spectral HDX satisfy an optimal (local) agreement testing theorem and an optimal global tester under stronger ℓ∞-type assumptions, a stepping stone towards improved low-soundness probabilistically checkable proofs and hardness of approximation.
일반주제명  
Computer science
일반주제명  
Mathematics
키워드  
High dimensional expanders
키워드  
Boolean analysis
키워드  
Approximation algorithms
키워드  
Graphs
기타저자  
University of California, San Diego Computer Science and Engineering
기본자료저록  
Dissertations Abstracts International. 86-01B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI31327738
■040    ▼aMiAaPQ▼cMiAaPQ
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■1001  ▼aHopkins,  Nathaniel  Max  Klevit.
■24510▼aHigh  Dimensional  Expanders  in  Analysis  and  Computation
■260    ▼a[Sl]▼bUniversity  of  California,  San  Diego▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a820  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-01,  Section:  B.
■500    ▼aAdvisor:  Kane,  Daniel;Lovett,  Shachar.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  San  Diego,  2024.
■520    ▼aHigh  dimensional  expanders  (HDX)  are  a  nascent  generalization  of  expander  graphs  (sparse  yet  robustly  connected  networks  that  play  a  core  role  in  the  theory  of  computation)  to  high  dimensional  domains.  Despite  recent  breakthrough  use  in  sampling  and  local  testability,  relatively  little  is  known  about  HDX,  their  properties,  and  their  broader  position  in  theoretical  computer  science.  In  this  dissertation,  we  develop  the  role  of  high  dimensional  expanders  in  computation  through  the  interplay  of  Boolean  analysis,  concentration  of  measure,  approximation  algorithms,  and  hardness  of  approximation.In  the  first  half  of  this  dissertation,  we  develop  a  robust  theory  of  Fourier  and  probabilistic  analysis  on  HDX.  This  includes  generalizations  of  standard  tools  of  theoretical  computer  science  such  as  the  Fourier  decomposition,  hypercontractivity,  and  Chernoff  bounds,  as  well  as  more  application-focused  techniques  such  as  symmetrization,  reverse  hypercontractivity,  and  concentration  of  high  degree  functions.  In  many  cases,  our  results  give  the  first  sparse  domains  satisfying  such  notions,  a  critical  consideration  in  application  where  density  or  'degree'  controls  the  cost  associated  with  their  use.In  the  second  half  of  this  dissertation,  we  give  applications  of  these  ideas  to  algorithms,  complexity,  and  mathematics.  Algorithmically,  we  show  the  local  structure  of  high  dimensional  expanders  can  be  exploited  to  build  fast  approximation  algorithms  for  unique  games,  and  explore  implications  of  fast  approximate  sampling  algorithms  on  HDX  to  massive  multiplayer  matrix  games.  In  mathematics,  we  show  high  dimensional  expanders  have  optimal  geometric  overlap,  extend  a  variant  of  the  Frankl-Rodl  theorem  to  HDX,  and  prove  new  degree  lower  bounds  for  certain  HDX.  Finally  in  complexity  we  leverage  new  topological  HDX  to  construct  optimally  hard  explicit  constraint  satisfaction  problems  for  Sum-of-Squares  (a  powerful  optimization  paradigm),  and  prove  spectral  HDX  satisfy  an  optimal  (local)  agreement  testing  theorem  and  an  optimal  global  tester  under  stronger  ℓ∞-type  assumptions,  a  stepping  stone  towards  improved  low-soundness  probabilistically  checkable  proofs  and  hardness  of  approximation.
■590    ▼aSchool  code:  0033.
■650  4▼aComputer  science
■650  4▼aMathematics
■653    ▼aHigh  dimensional  expanders
■653    ▼aBoolean  analysis
■653    ▼aApproximation  algorithms
■653    ▼aGraphs
■690    ▼a0984
■690    ▼a0405
■71020▼aUniversity  of  California,  San  Diego▼bComputer  Science  and  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g86-01B.
■790    ▼a0033
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162213▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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