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Topics in Galaxy Formation and Chemical Evolution: Structure of Dark Matter Haloes and Inference of Nucleosynthetic Production Patterns
Topics in Galaxy Formation and Chemical Evolution: Structure of Dark Matter Haloes and Inference of Nucleosynthetic Production Patterns
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152820
- ISBN
- 9798384098690
- DDC
- 523
- 서명/저자
- Topics in Galaxy Formation and Chemical Evolution: Structure of Dark Matter Haloes and Inference of Nucleosynthetic Production Patterns
- 발행사항
- [Sl] : University of Minnesota, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 148 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Qian, Yong-Zhong.
- 학위논문주기
- Thesis (Ph.D.)--University of Minnesota, 2024.
- 초록/해제
- 요약In this thesis, after a general introduction to galaxy formation and its subsequent chemical evolution, we explore two topics contained within this field: the structure of dark matter haloes and the inference of r-process production patterns.The flattening of galactic rotation curves suggests that visible galaxies are surrounded by dark matter haloes. Much of what we have learned about the internal structure of these haloes has come from N-body simulations. Significantly, in 1997, Navarro, Frenk, and White showed that dark matter haloes have a universal density profile. Despite many attempts, theoretical motivation for the existence of this simple analytical form has not been demonstrated. In 2010, Hjorth and Williams developed DARKexp, an analytical form of the energy distribution theoretically motivated by the principles of statistical mechanics which has been shown to match those of simulated haloes.Using the formalism of the isotropic distribution function, which allows relation between the density profile, energy distribution, and distribution function, we perform a detailed comparison between the NFW density profile, DARKexp energy distribution, and a sample of N-body simulated haloes. We determine that both the NFW density profile and DARKexp energy distribution fit well not only in their density and energy distribution, respectively, but also in the other quantities which are inferred from their fits. We also find a connection between the characteristic parameters of the NFW and DARKexp profiles, which connects them together and hints at motivation for the existence of the universal halo structure.We also present new scaling relations for the distribution function and energy distribution from rmax(E) the inversion of the gravitational potential Ψ(r), which are universally satisfied by simulated dark matter haloes. These scaling relations allow for simple numerical calculation of the distribution function and energy distribution from only the gravitational potential. We connect these scaling relationships to the secondary infall model, the isothermal sphere, and other scaling relations that have been discovered, and demonstrate that these scaling relations are inexorably tied to the universal halo structure evidenced by the NFW density profile and DARKexp energy distribution.In the second part, we consider the r-process, which involves nucleosynthesis far from equilibrium in extreme environments. Therefore, this nucleosynthetic production is inherently difficult to understand. We present a new method for inferring the nucleosynthetic production templates of r-process sources directly from the abundance data of metal-poor stars. From a small test dataset, we derive the production ratios for two r-process sources, which we identify as Core-Collapse Supernovae and Neutron Star Mergers, respectively, and compare the ratios that we have inferred to ab-initio studies of r-process nucleosynthesis, finding general consistency. We also demonstrate approximate consistency between our model and the solar system nucleosynthetic inventory.
- 일반주제명
- Astrophysics
- 일반주제명
- Physics
- 일반주제명
- Nuclear physics
- 일반주제명
- Applied mathematics
- 일반주제명
- Astronomy
- 키워드
- Galaxy formation
- 키워드
- Baryonic matter
- 기타저자
- University of Minnesota Physics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152820
■006m o d
■007cr#unu||||||||
■020 ▼a9798384098690
■035 ▼a(MiAaPQ)AAI31559225
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aGross, Axel Paul.
■24510▼aTopics in Galaxy Formation and Chemical Evolution: Structure of Dark Matter Haloes and Inference of Nucleosynthetic Production Patterns
■260 ▼a[Sl]▼bUniversity of Minnesota▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a148 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Qian, Yong-Zhong.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2024.
■520 ▼aIn this thesis, after a general introduction to galaxy formation and its subsequent chemical evolution, we explore two topics contained within this field: the structure of dark matter haloes and the inference of r-process production patterns.The flattening of galactic rotation curves suggests that visible galaxies are surrounded by dark matter haloes. Much of what we have learned about the internal structure of these haloes has come from N-body simulations. Significantly, in 1997, Navarro, Frenk, and White showed that dark matter haloes have a universal density profile. Despite many attempts, theoretical motivation for the existence of this simple analytical form has not been demonstrated. In 2010, Hjorth and Williams developed DARKexp, an analytical form of the energy distribution theoretically motivated by the principles of statistical mechanics which has been shown to match those of simulated haloes.Using the formalism of the isotropic distribution function, which allows relation between the density profile, energy distribution, and distribution function, we perform a detailed comparison between the NFW density profile, DARKexp energy distribution, and a sample of N-body simulated haloes. We determine that both the NFW density profile and DARKexp energy distribution fit well not only in their density and energy distribution, respectively, but also in the other quantities which are inferred from their fits. We also find a connection between the characteristic parameters of the NFW and DARKexp profiles, which connects them together and hints at motivation for the existence of the universal halo structure.We also present new scaling relations for the distribution function and energy distribution from rmax(E) the inversion of the gravitational potential Ψ(r), which are universally satisfied by simulated dark matter haloes. These scaling relations allow for simple numerical calculation of the distribution function and energy distribution from only the gravitational potential. We connect these scaling relationships to the secondary infall model, the isothermal sphere, and other scaling relations that have been discovered, and demonstrate that these scaling relations are inexorably tied to the universal halo structure evidenced by the NFW density profile and DARKexp energy distribution.In the second part, we consider the r-process, which involves nucleosynthesis far from equilibrium in extreme environments. Therefore, this nucleosynthetic production is inherently difficult to understand. We present a new method for inferring the nucleosynthetic production templates of r-process sources directly from the abundance data of metal-poor stars. From a small test dataset, we derive the production ratios for two r-process sources, which we identify as Core-Collapse Supernovae and Neutron Star Mergers, respectively, and compare the ratios that we have inferred to ab-initio studies of r-process nucleosynthesis, finding general consistency. We also demonstrate approximate consistency between our model and the solar system nucleosynthetic inventory.
■590 ▼aSchool code: 0130.
■650 4▼aAstrophysics
■650 4▼aPhysics
■650 4▼aNuclear physics
■650 4▼aApplied mathematics
■650 4▼aAstronomy
■653 ▼aGalaxy formation
■653 ▼aChemical evolution
■653 ▼aDark matter haloes
■653 ▼aNucleosynthetic production
■653 ▼aBaryonic matter
■690 ▼a0596
■690 ▼a0605
■690 ▼a0756
■690 ▼a0606
■690 ▼a0364
■71020▼aUniversity of Minnesota▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164006▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
