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Hubble Constant and Strong Gravitational Lensing
Hubble Constant and Strong Gravitational Lensing
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105150
- ISBN
- 9798293831005
- DDC
- 523
- 저자명
- Schmidt, Thomas.
- 서명/저자
- Hubble Constant and Strong Gravitational Lensing
- 발행사항
- [Sl] : University of California, Los Angeles, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 269 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Treu, Tommaso L.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Los Angeles, 2025.
- 초록/해제
- 요약The persistent tension between early and late universe measurements of the Hubble constant (H0) represents one of the most significant challenges in modern cosmology, with implications for our understanding of fundamental physics. Strong gravitational lensing of variablesources offers a unique pathway to independent H0 measurements that bypass systematic uncertainties inherent in traditional methods that rely on the distance ladder. However, high-precision strong lens modeling has been computationally expensive and is further limited by extensive human resources required, thus creating bottlenecks for exploiting the wealth of strong lens discoveries expected from current and upcoming surveys.This dissertation presents advances in strong gravitational lensing that address these challenges while demonstrating the extraordinary potential of complex lensing configurations for high-precision cosmography. I develop and implement an automated modeling pipeline that drastically reduces computational time and investigator input requirements for cosmography-grade lens modeling. Applied to a sample of 31 quadruply imaged quasar systems, observed with the Hubble Space Telescope, this automated approach successfully produces models for 30/31 systems using 100 CPU hours and minimal human intervention per system, representing significant improvement over traditional methods typically requiring 105−6 CPU hours and one ore more years of investigator time.Complementing this large-scale development in methodology, I present comprehensive analyses of J1721+8842, an extraordinary strong lens system that exemplifies nature's capacity to provide precision laboratories. Initially modeled as an unprecedented dual AGN configuration, subsequent time-delay measurements and James Webb Space Telescope spectroscopic observations reveal J1721+8842 to be the first confirmed Einstein zigzag lens, a single quasar lensed into six images by compound deflection from two nearly perfectly aligned deflectors at redshifts z1 = 0.184 and z2 = 1.885. This remarkable geometry enables percent-level precision in time-delay predictions and provides up to 15 potential time-delay measurements compared to the 6 typically available from quadruply lensed systems, thereby dramatically enhancing both statistical precision and systematic error control.The work presented in this thesis demonstrates that uniform cosmography-grade modeling of large strong lens samples is achievable through automation, while exceptional individual systems can achieve percent-level precision in H0 measurements. These advances provide the technical foundation necessary to transform strong gravitational lensing from a specialized technique into a cornerstone for high-precision cosmology, capable of providing independent constraints necessary to resolve the Hubble tension and advancing our understanding of cosmic evolution.
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Optics
- 키워드
- Hubble constant
- 키워드
- Cosmology
- 키워드
- Cosmic evolution
- 기타저자
- University of California, Los Angeles Astronomy and Astrophysics 00EB
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105150
■006m o d
■007cr#unu||||||||
■020 ▼a9798293831005
■035 ▼a(MiAaPQ)AAI32242046
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aSchmidt, Thomas.
■24510▼aHubble Constant and Strong Gravitational Lensing
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a269 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Treu, Tommaso L.
■5021 ▼aThesis (Ph.D.)--University of California, Los Angeles, 2025.
■520 ▼aThe persistent tension between early and late universe measurements of the Hubble constant (H0) represents one of the most significant challenges in modern cosmology, with implications for our understanding of fundamental physics. Strong gravitational lensing of variablesources offers a unique pathway to independent H0 measurements that bypass systematic uncertainties inherent in traditional methods that rely on the distance ladder. However, high-precision strong lens modeling has been computationally expensive and is further limited by extensive human resources required, thus creating bottlenecks for exploiting the wealth of strong lens discoveries expected from current and upcoming surveys.This dissertation presents advances in strong gravitational lensing that address these challenges while demonstrating the extraordinary potential of complex lensing configurations for high-precision cosmography. I develop and implement an automated modeling pipeline that drastically reduces computational time and investigator input requirements for cosmography-grade lens modeling. Applied to a sample of 31 quadruply imaged quasar systems, observed with the Hubble Space Telescope, this automated approach successfully produces models for 30/31 systems using 100 CPU hours and minimal human intervention per system, representing significant improvement over traditional methods typically requiring 105−6 CPU hours and one ore more years of investigator time.Complementing this large-scale development in methodology, I present comprehensive analyses of J1721+8842, an extraordinary strong lens system that exemplifies nature's capacity to provide precision laboratories. Initially modeled as an unprecedented dual AGN configuration, subsequent time-delay measurements and James Webb Space Telescope spectroscopic observations reveal J1721+8842 to be the first confirmed Einstein zigzag lens, a single quasar lensed into six images by compound deflection from two nearly perfectly aligned deflectors at redshifts z1 = 0.184 and z2 = 1.885. This remarkable geometry enables percent-level precision in time-delay predictions and provides up to 15 potential time-delay measurements compared to the 6 typically available from quadruply lensed systems, thereby dramatically enhancing both statistical precision and systematic error control.The work presented in this thesis demonstrates that uniform cosmography-grade modeling of large strong lens samples is achievable through automation, while exceptional individual systems can achieve percent-level precision in H0 measurements. These advances provide the technical foundation necessary to transform strong gravitational lensing from a specialized technique into a cornerstone for high-precision cosmology, capable of providing independent constraints necessary to resolve the Hubble tension and advancing our understanding of cosmic evolution.
■590 ▼aSchool code: 0031.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aOptics
■653 ▼aHubble constant
■653 ▼aStrong gravitational lensing
■653 ▼aCosmology
■653 ▼aQuadruply lensed quasar
■653 ▼aCosmic evolution
■690 ▼a0596
■690 ▼a0752
■690 ▼a0606
■71020▼aUniversity of California, Los Angeles▼bAstronomy and Astrophysics 00EB.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0031
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359636▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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