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Algorithms for the Nuclear Many-Body Problem and Beyond
Algorithms for the Nuclear Many-Body Problem and Beyond
Algorithms for the Nuclear Many-Body Problem and Beyond

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211152936
ISBN  
9798896076087
DDC  
530
저자명  
Hicks, Ashe.
서명/저자  
Algorithms for the Nuclear Many-Body Problem and Beyond
발행사항  
[Sl] : Michigan State University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
91 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
주기사항  
Advisor: Lee, Dean.
학위논문주기  
Thesis (Ph.D.)--Michigan State University, 2024.
초록/해제  
요약The nuclear many body problem allows us to take our fundamental understanding of the most basic building blocks of the universe and from them build an understanding of larger and more complicated systems. It is the essential problem of how individual particles form atoms and larger structures. Its applications are varied, and many tools have been developed to address this problem. Despite the breakneck pace of computational development, the nuclear many-body problem still stretches our computational and numerical methods to and beyond their breaking points. In this work, we introduce two algorithms which can help in solving the nuclear many-body problem. First, we introduce trimmed sampling. This is an algorithm which can be used to treat noisy data obtained from highly sensitive calculations, particularly the generalized eigenvalue problem which emerges from a number of techniques. We solve a number of example models for which small errors such as rounding error or statistical noise are sufficient to entirely destroy any usable results, but see that trimmed sampling is able to recover good results from these methods. It does so using Bayesian inference, by applying physics-informed criteria and statistical sampling methods we are able to eliminate any solutions which are non-physical, leaving a more accurate, physically meaningful result. We show ways that this algorithm can be further expanded and enhanced, improving sampling statistics, convergence rate, and accuracy, before demonstrating its performance on the Lipkin model. In the next section, we describe the Projected Cooling algorithm. This is a method whereby we use an analogue of evaporative cooling to calculate the ground state of a system. We show results of projected cooling for several models. Together, this work provides a description of useful algorithms which can be applied to the nuclear many-body problem.
일반주제명  
Computational physics
일반주제명  
Nuclear physics
일반주제명  
Quantum physics
키워드  
Lipkin
키워드  
Markov Chain Monte Carlo
키워드  
Nuclear many-body problem
키워드  
Trimmed sampling
기타저자  
Michigan State University Physics - Doctor of Philosophy
기본자료저록  
Dissertations Abstracts International. 86-04B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aHicks,  Ashe.
■24510▼aAlgorithms  for  the  Nuclear  Many-Body  Problem  and  Beyond
■260    ▼a[Sl]▼bMichigan  State  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a91  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  B.
■500    ▼aAdvisor:  Lee,  Dean.
■5021  ▼aThesis  (Ph.D.)--Michigan  State  University,  2024.
■520    ▼aThe  nuclear  many  body  problem  allows  us  to  take  our  fundamental  understanding  of  the  most  basic  building  blocks  of  the  universe  and  from  them  build  an  understanding  of  larger  and  more  complicated  systems.  It  is  the  essential  problem  of  how  individual  particles  form  atoms  and  larger  structures.  Its  applications  are  varied,  and  many  tools  have  been  developed  to  address  this  problem.  Despite  the  breakneck  pace  of  computational  development,  the  nuclear  many-body  problem  still  stretches  our  computational  and  numerical  methods  to  and  beyond  their  breaking  points.  In  this  work,  we  introduce  two  algorithms  which  can  help  in  solving  the  nuclear  many-body  problem.  First,  we  introduce  trimmed  sampling.  This  is  an  algorithm  which  can  be  used  to  treat  noisy  data  obtained  from  highly  sensitive  calculations,  particularly  the  generalized  eigenvalue  problem  which  emerges  from  a  number  of  techniques.  We  solve  a  number  of  example  models  for  which  small  errors  such  as  rounding  error  or  statistical  noise  are  sufficient  to  entirely  destroy  any  usable  results,  but  see  that  trimmed  sampling  is  able  to  recover  good  results  from  these  methods.  It  does  so  using  Bayesian  inference,  by  applying  physics-informed  criteria  and  statistical  sampling  methods  we  are  able  to  eliminate  any  solutions  which  are  non-physical,  leaving  a  more  accurate,  physically  meaningful  result.  We  show  ways  that  this  algorithm  can  be  further  expanded  and  enhanced,  improving  sampling  statistics,  convergence  rate,  and  accuracy,  before  demonstrating  its  performance  on  the  Lipkin  model.  In  the  next  section,  we  describe  the  Projected  Cooling  algorithm.  This  is  a  method  whereby  we  use  an  analogue  of  evaporative  cooling  to  calculate  the  ground  state  of  a  system.  We  show  results  of  projected  cooling  for  several  models.  Together,  this  work  provides  a  description  of  useful  algorithms  which  can  be  applied  to  the  nuclear  many-body  problem.
■590    ▼aSchool  code:  0128.
■650  4▼aComputational  physics
■650  4▼aNuclear  physics
■650  4▼aQuantum  physics
■653    ▼aLipkin
■653    ▼aMarkov  Chain  Monte  Carlo
■653    ▼aNuclear  many-body  problem
■653    ▼aTrimmed  sampling
■690    ▼a0756
■690    ▼a0216
■690    ▼a0599
■71020▼aMichigan  State  University▼bPhysics  -  Doctor  of  Philosophy.
■7730  ▼tDissertations  Abstracts  International▼g86-04B.
■790    ▼a0128
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164229▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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