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From Models of the Early Universe to Developing Experiments for Axionic Dark Matter Detection
From Models of the Early Universe to Developing Experiments for Axionic Dark Matter Detection
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151447
- ISBN
- 9798382810911
- DDC
- 530
- 서명/저자
- From Models of the Early Universe to Developing Experiments for Axionic Dark Matter Detection
- 발행사항
- [Sl] : Princeton University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 264 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Page, Lyman A.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2024.
- 초록/해제
- 요약Modern physical cosmology is thriving with abundant data and new observations from the James Webb Space Telescope, multiple CMB experiments, and new surveys of galaxies from the ground and space. This thesis uses theoretical and experimental approaches to discuss two important topics of cosmology: early universe curvature perturbations and dark matter.One of the critical questions posed to theoretical cosmology is to explain the origin of temperature fluctuations seen on the cosmic microwave background. In the first part of the thesis, we explore a new entropic mechanism for generating curvature perturbations in the context of non-singular bouncing cosmologies. A gauge-invariant hydrodynamic and a microphysical approach are used to demonstrate the mechanism. We show that the curvature perturbations can be generated from the entropic ones in a cosmological model with two kinetically coupled scalar fields, an arbitrary potential, and a higher-order (quartic) kinetic term. We also present a concrete example of a cosmological scenario in which a nearly scale-invariant spectrum of curvature perturbations is generated on super-Hubble scales at the end of the phase of the universe contraction in accordance with the current observations.In the second part of the thesis, we discuss an experimental search for dark matter. Multiple pieces of indirect evidence suggest that about one-fourth of the universe's energy budget consists of dark matter, but it has yet to be observed. In particular, we focus on sub-µev axion as one of the most promising dark matter candidates. We discuss experimental approaches in the search for sub-µeV axions and argue that developing a high-Q superconducting lumped-element resonator is one of the key elements of the upcoming dark matter search experiments. We then demonstrate our current development of a new state-of-the-art resonator with a Q factor of 710,000 at 301 kHz, the highest value recorded near this frequency.
- 일반주제명
- Physics
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 키워드
- Cosmology
- 키워드
- Dark matter
- 기타저자
- Princeton University Physics
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151447
■006m o d
■007cr#unu||||||||
■020 ▼a9798382810911
■035 ▼a(MiAaPQ)AAI31296511
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aKolevatov, Roman.▼0(orcid)0000-0002-0603-9622
■24510▼aFrom Models of the Early Universe to Developing Experiments for Axionic Dark Matter Detection
■260 ▼a[Sl]▼bPrinceton University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a264 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Page, Lyman A.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2024.
■520 ▼aModern physical cosmology is thriving with abundant data and new observations from the James Webb Space Telescope, multiple CMB experiments, and new surveys of galaxies from the ground and space. This thesis uses theoretical and experimental approaches to discuss two important topics of cosmology: early universe curvature perturbations and dark matter.One of the critical questions posed to theoretical cosmology is to explain the origin of temperature fluctuations seen on the cosmic microwave background. In the first part of the thesis, we explore a new entropic mechanism for generating curvature perturbations in the context of non-singular bouncing cosmologies. A gauge-invariant hydrodynamic and a microphysical approach are used to demonstrate the mechanism. We show that the curvature perturbations can be generated from the entropic ones in a cosmological model with two kinetically coupled scalar fields, an arbitrary potential, and a higher-order (quartic) kinetic term. We also present a concrete example of a cosmological scenario in which a nearly scale-invariant spectrum of curvature perturbations is generated on super-Hubble scales at the end of the phase of the universe contraction in accordance with the current observations.In the second part of the thesis, we discuss an experimental search for dark matter. Multiple pieces of indirect evidence suggest that about one-fourth of the universe's energy budget consists of dark matter, but it has yet to be observed. In particular, we focus on sub-µev axion as one of the most promising dark matter candidates. We discuss experimental approaches in the search for sub-µeV axions and argue that developing a high-Q superconducting lumped-element resonator is one of the key elements of the upcoming dark matter search experiments. We then demonstrate our current development of a new state-of-the-art resonator with a Q factor of 710,000 at 301 kHz, the highest value recorded near this frequency.
■590 ▼aSchool code: 0181.
■650 4▼aPhysics
■650 4▼aAstrophysics
■650 4▼aAstronomy
■653 ▼aAxion dark matter experiment
■653 ▼aCosmology
■653 ▼aDark matter
■653 ▼aGeneral Relativity
■653 ▼aCurvature perturbations
■690 ▼a0605
■690 ▼a0596
■690 ▼a0606
■71020▼aPrinceton University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161802▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
