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Constraining New Physics With Cosmological & Astrophysical Data
Constraining New Physics With Cosmological & Astrophysical Data
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153110
- ISBN
- 9798384442127
- DDC
- 523
- 저자명
- Moltner, Stacie.
- 서명/저자
- Constraining New Physics With Cosmological & Astrophysical Data
- 발행사항
- [Sl] : The University of Texas at Austin, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 124 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Boddy, Kimberly K.
- 학위논문주기
- Thesis (Ph.D.)--The University of Texas at Austin, 2024.
- 초록/해제
- 요약This dissertation consists of two parts, totaling three chapters - each individual pieces of work that consider new theoretical physics models and their compatibility with cosmological or astrophysical data. Part I (Chapters 1 and 2) comprises work in cosmology, and Part II (Chapter 3) in astrophysics. Each begin with a brief introduction. In Chapter 1 we investigate the quantum entanglement of inflationary perturbations and their imprint on the cosmic microwave background (CMB). We consider a scenario in which fluctuations in the scalar metric perturbation become entangled with those of a subdominant scalar field during cosmological inflation, to determine whether entanglement during inflation could result in observable effects in the CMB. We numerically evolve the equations of motion for the scalar metric perturbations and spectator field through the inflationary period for a variety of initial conditions, calculate the power spectra and CMB anisotropy spectra, and compare our results to Planck CMB data. Chapter 1 is based on published work with Rose Baunach, Nadia Bolis, Rich Holman, and Ben Richard [1].In Chapter 2, we consider scattering between dark matter (DM) and neutrons and protons in the early universe, placing the first constraints on DM-helium interactions using CMB data. We describe theoretical particle physics models for interactions between DM and nucleons via scalar, pseudoscalar, and vector mediators, and consider three scenarios for DM coupling to neutrons and/or protons. For each scenario, DM will scatter with helium and/or hydrogen with a cross section that has a power-law dependence on the relative DM-baryon velocity. We present constraints on the momentum-transfer cross section consistent with Planck CMB data for a range of DM masses for each coupling scenario. Chapter 2 is based on published work with Kim Boddy and Gordan Krnjaic [2].In Chapter 3, we present an alternative to the standard indirect detection paradigm of DM annihilation or decay. We consider the absorption of a DM particle by a nucleus resulting in nuclear excitation and the subsequent prompt release of a photon. For DM absorption by carbon and oxygen present in the Galactic Center of the Milky Way, the resulting discrete photon spectra could be measured by gamma-ray detectors. Using DM and baryon density and velocity distributions, we numerically calculate the expected photon flux for each nuclear excitation energy and present constraints on the DM-nucleus coupling from existing COMPTEL data and projections for future gamma-ray experiments AMEGO-X, e-ASTROGAM, and GRAMS. Chapter 3 is based on published work with Kim Boddy, Bhaskar Dutta, Addy Evans, Wei-Chih Huang, and Louis Strigari [3].
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Theoretical physics
- 일반주제명
- Computational physics
- 키워드
- Cosmology
- 키워드
- Dark matter
- 기타저자
- The University of Texas at Austin Physics
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017164984
■00520250211153110
■006m o d
■007cr#unu||||||||
■020 ▼a9798384442127
■035 ▼a(MiAaPQ)AAI31690644
■035 ▼a(MiAaPQ)123vireo25049Moltner
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aMoltner, Stacie.
■24510▼aConstraining New Physics With Cosmological & Astrophysical Data
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a124 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Boddy, Kimberly K.
■5021 ▼aThesis (Ph.D.)--The University of Texas at Austin, 2024.
■520 ▼aThis dissertation consists of two parts, totaling three chapters - each individual pieces of work that consider new theoretical physics models and their compatibility with cosmological or astrophysical data. Part I (Chapters 1 and 2) comprises work in cosmology, and Part II (Chapter 3) in astrophysics. Each begin with a brief introduction. In Chapter 1 we investigate the quantum entanglement of inflationary perturbations and their imprint on the cosmic microwave background (CMB). We consider a scenario in which fluctuations in the scalar metric perturbation become entangled with those of a subdominant scalar field during cosmological inflation, to determine whether entanglement during inflation could result in observable effects in the CMB. We numerically evolve the equations of motion for the scalar metric perturbations and spectator field through the inflationary period for a variety of initial conditions, calculate the power spectra and CMB anisotropy spectra, and compare our results to Planck CMB data. Chapter 1 is based on published work with Rose Baunach, Nadia Bolis, Rich Holman, and Ben Richard [1].In Chapter 2, we consider scattering between dark matter (DM) and neutrons and protons in the early universe, placing the first constraints on DM-helium interactions using CMB data. We describe theoretical particle physics models for interactions between DM and nucleons via scalar, pseudoscalar, and vector mediators, and consider three scenarios for DM coupling to neutrons and/or protons. For each scenario, DM will scatter with helium and/or hydrogen with a cross section that has a power-law dependence on the relative DM-baryon velocity. We present constraints on the momentum-transfer cross section consistent with Planck CMB data for a range of DM masses for each coupling scenario. Chapter 2 is based on published work with Kim Boddy and Gordan Krnjaic [2].In Chapter 3, we present an alternative to the standard indirect detection paradigm of DM annihilation or decay. We consider the absorption of a DM particle by a nucleus resulting in nuclear excitation and the subsequent prompt release of a photon. For DM absorption by carbon and oxygen present in the Galactic Center of the Milky Way, the resulting discrete photon spectra could be measured by gamma-ray detectors. Using DM and baryon density and velocity distributions, we numerically calculate the expected photon flux for each nuclear excitation energy and present constraints on the DM-nucleus coupling from existing COMPTEL data and projections for future gamma-ray experiments AMEGO-X, e-ASTROGAM, and GRAMS. Chapter 3 is based on published work with Kim Boddy, Bhaskar Dutta, Addy Evans, Wei-Chih Huang, and Louis Strigari [3].
■590 ▼aSchool code: 0227.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aTheoretical physics
■650 4▼aComputational physics
■653 ▼aAstrophysical data
■653 ▼aCosmology
■653 ▼aCosmic microwave background
■653 ▼aDark matter
■653 ▼aGamma-ray detectors
■690 ▼a0753
■690 ▼a0596
■690 ▼a0216
■690 ▼a0606
■71020▼aThe University of Texas at Austin▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0227
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164984▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
