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Building Beyond the Standard Model: Tools from Cosmology to Particle Theory
Building Beyond the Standard Model: Tools from Cosmology to Particle Theory
Building Beyond the Standard Model: Tools from Cosmology to Particle Theory

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202103604
ISBN  
9798280719279
DDC  
530.1
저자명  
Bagherian, Hengameh.
서명/저자  
Building Beyond the Standard Model: Tools from Cosmology to Particle Theory
발행사항  
[Sl] : Harvard University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
203 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Reece, Matthew.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2025.
초록/해제  
요약The current landscape of high-energy theory and cosmology suffers from an abundance of theoretical models coupled with a lack of immediate new data to constrain them. This thesis addresses several open questions in early-universe cosmology and beyond-the-Standard-Model (BSM) particle physics, specifically focusing on inflation, dark matter, axions and axion strings, and baryogenesis. Rather than relying solely on forthcoming experimental results, I argue for refining the BSM model space through theoretical consistency checks and cross-examination against multiple existing datasets. For instance, inflationary models often encounter severe naturalness (or η) problems; applying effective field theory techniques and symmetry considerations helps exclude models that fail these theoretical standards. Similarly, axion models naturally predict distinctive topological defects, such as axion strings, allowing their observational signatures (or lack thereof) to impose valuable constraints. On the observational side, I emphasize that jointly analyzing the Hubble and large-scale structure (LSS) tensions can significantly constrain dark-sector theories. Additionally, I introduce a novel observational probe, analyzing the effect of early universe inhomogeneities generated prior to Big Bang Nucleosynthesis (BBN) on predicted deuterium abundances. This probe rules out baryogenesis scenarios that produce excessive inhomogeneities which are not fully erased by diffusion, and it can potentially constrain regions of parameter space in prominent high energy scale models such as electroweak baryogenesis (EWBG). Together, these theoretical and observational approaches offer robust methods for refining the BSM landscape and demonstrate the critical role particle theorists can play in interpreting cosmological data, even in the absence of new experimental results.
일반주제명  
Theoretical physics
일반주제명  
Particle physics
일반주제명  
Physics
키워드  
Axion inflation
키워드  
Axion strings
키워드  
Baryogenesis
키워드  
Beyond the standard model
키워드  
Big Bang Nucleosynthesis
키워드  
Dark radiation
기타저자  
Harvard University Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aBagherian,  Hengameh.▼0(orcid)0000-0001-6504-5187
■24510▼aBuilding  Beyond  the  Standard  Model:  Tools  from  Cosmology  to  Particle  Theory
■260    ▼a[Sl]▼bHarvard  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a203  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Reece,  Matthew.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2025.
■520    ▼aThe  current  landscape  of  high-energy  theory  and  cosmology  suffers  from  an  abundance  of  theoretical  models  coupled  with  a  lack  of  immediate  new  data  to  constrain  them.  This  thesis  addresses  several  open  questions  in  early-universe  cosmology  and  beyond-the-Standard-Model  (BSM)  particle  physics,  specifically  focusing  on  inflation,  dark  matter,  axions  and  axion  strings,  and  baryogenesis.  Rather  than  relying  solely  on  forthcoming  experimental  results,  I  argue  for  refining  the  BSM  model  space  through  theoretical  consistency  checks  and  cross-examination  against  multiple  existing  datasets.  For  instance,  inflationary  models  often  encounter  severe  naturalness  (or  η)  problems;  applying  effective  field  theory  techniques  and  symmetry  considerations  helps  exclude  models  that  fail  these  theoretical  standards.  Similarly,  axion  models  naturally  predict  distinctive  topological  defects,  such  as  axion  strings,  allowing  their  observational  signatures  (or  lack  thereof)  to  impose  valuable  constraints.  On  the  observational  side,  I  emphasize  that  jointly  analyzing  the  Hubble  and  large-scale  structure  (LSS)  tensions  can  significantly  constrain  dark-sector  theories.  Additionally,  I  introduce  a  novel  observational  probe,  analyzing  the  effect  of  early  universe  inhomogeneities  generated  prior  to  Big  Bang  Nucleosynthesis  (BBN)  on  predicted  deuterium  abundances.  This  probe  rules  out  baryogenesis  scenarios  that  produce  excessive  inhomogeneities  which  are  not  fully  erased  by  diffusion,  and  it  can  potentially  constrain  regions  of  parameter  space  in  prominent  high  energy  scale  models  such  as  electroweak  baryogenesis  (EWBG).  Together,  these  theoretical  and  observational  approaches  offer  robust  methods  for  refining  the  BSM  landscape  and  demonstrate  the  critical  role  particle  theorists  can  play  in  interpreting  cosmological  data,  even  in  the  absence  of  new  experimental  results.
■590    ▼aSchool  code:  0084.
■650  4▼aTheoretical  physics
■650  4▼aParticle  physics
■650  4▼aPhysics
■653    ▼aAxion  inflation
■653    ▼aAxion  strings
■653    ▼aBaryogenesis
■653    ▼aBeyond  the  standard  model
■653    ▼aBig  Bang  Nucleosynthesis
■653    ▼aDark  radiation
■690    ▼a0753
■690    ▼a0798
■690    ▼a0605
■71020▼aHarvard  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357815▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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