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Hunting Inflationary Fossils in Primordial Inhomogeneities- [electronic resource]
![Hunting Inflationary Fossils in Primordial Inhomogeneities - [electronic resource]](/Users/Baul/Images/book.png)
Hunting Inflationary Fossils in Primordial Inhomogeneities- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101555
- ISBN
- 9798380580977
- DDC
- 593.7
- 저자명
- Bodas, Arushi R.
- 서명/저자
- Hunting Inflationary Fossils in Primordial Inhomogeneities - [electronic resource]
- 발행사항
- [S.l.]: : University of Maryland, College Park., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(166 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
- 주기사항
- Advisor: Sundrum, Raman.
- 학위논문주기
- Thesis (Ph.D.)--University of Maryland, College Park, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약Cosmological observables such as the Cosmic Microwave Background (CMB) allow us to probe the early universe at extremely high energies far beyond the reach of any particle collider on Earth. In the inflationary paradigm, small perturbations in the energy distribution across space can be directly linked to the quantum fluctuations of an "inflaton" field that drives inflation. Using these perturbations, it is, therefore, possible to learn about physics at energies as high as 1013 GeV. In this thesis, we exploit this powerful connection and explore novel mechanisms to hunt for previously unexplored inflationary dynamics.During inflation, particles with masses larger than the inflationary Hubble scale Hinf are produced due to an accelerating spacetime. If coupled to the inflaton, these particles could imprint distinct oscillatory features in higher moments of the density perturbations. Since Hinf can be as high as 5x1013 GeV, these oscillatory features present a unique opportunity to directly detect very heavy particles with masses ∼ Hinf. In Chapter 2, we explore a mechanism that can boost spin-0 particle production by mining the kinetic energy of the inflaton. This leads to an enhancement of the oscillatory features, which can bring heavier particles with masses up to 60Hinf within the reach of observations.In the final part of the thesis, spanning chapters 3 and 4, we explore the viability of gravitational wave backgrounds (GWB) as novel data sources for unexplored inflationary physics. It was recently shown that a GWB from a first-order phase transition must exhibit fluctuations, much like the CMB. Despite the close analogy, it is possible for fluctuations of the GWB to differ significantly in their detailed pattern from those of the CMB, which would imply the existence of a second light field during inflation in addition to the inflaton. Such a GWB could thus unlock a wealth of new information about multi-field inflation. In Chapter 3, we elaborate on this point with an example. We show that there may exist signals that cannot be extracted using standard cosmological probes such as the CMB and galaxy surveys, but can in principle be detected within GWB with upcoming and proposed gravitational wave experiments. Lastly, in Chapter 4, we focus on the detectability of GWB itself. We discuss a cosmological mechanism that can enhance the strength of the gravitational wave signal from phase transitions, thereby increasing their detection prospects significantly.
- 일반주제명
- Particle physics.
- 일반주제명
- Applied physics.
- 일반주제명
- Physics.
- 키워드
- Cosmology
- 키워드
- Inflation
- 키워드
- Isocurvature
- 키워드
- Non-Gaussianity
- 기타저자
- University of Maryland, College Park Physics
- 기본자료저록
- Dissertations Abstracts International. 85-04B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520240214101555
■006m o d
■007cr#unu||||||||
■020 ▼a9798380580977
■035 ▼a(MiAaPQ)AAI30574899
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a593.7
■1001 ▼aBodas, Arushi R.▼0(orcid)0000-0003-4664-4277
■24510▼aHunting Inflationary Fossils in Primordial Inhomogeneities▼h[electronic resource]
■260 ▼a[S.l.]:▼bUniversity of Maryland, College Park. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(166 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-04, Section: B.
■500 ▼aAdvisor: Sundrum, Raman.
■5021 ▼aThesis (Ph.D.)--University of Maryland, College Park, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aCosmological observables such as the Cosmic Microwave Background (CMB) allow us to probe the early universe at extremely high energies far beyond the reach of any particle collider on Earth. In the inflationary paradigm, small perturbations in the energy distribution across space can be directly linked to the quantum fluctuations of an "inflaton" field that drives inflation. Using these perturbations, it is, therefore, possible to learn about physics at energies as high as 1013 GeV. In this thesis, we exploit this powerful connection and explore novel mechanisms to hunt for previously unexplored inflationary dynamics.During inflation, particles with masses larger than the inflationary Hubble scale Hinf are produced due to an accelerating spacetime. If coupled to the inflaton, these particles could imprint distinct oscillatory features in higher moments of the density perturbations. Since Hinf can be as high as 5x1013 GeV, these oscillatory features present a unique opportunity to directly detect very heavy particles with masses ∼ Hinf. In Chapter 2, we explore a mechanism that can boost spin-0 particle production by mining the kinetic energy of the inflaton. This leads to an enhancement of the oscillatory features, which can bring heavier particles with masses up to 60Hinf within the reach of observations.In the final part of the thesis, spanning chapters 3 and 4, we explore the viability of gravitational wave backgrounds (GWB) as novel data sources for unexplored inflationary physics. It was recently shown that a GWB from a first-order phase transition must exhibit fluctuations, much like the CMB. Despite the close analogy, it is possible for fluctuations of the GWB to differ significantly in their detailed pattern from those of the CMB, which would imply the existence of a second light field during inflation in addition to the inflaton. Such a GWB could thus unlock a wealth of new information about multi-field inflation. In Chapter 3, we elaborate on this point with an example. We show that there may exist signals that cannot be extracted using standard cosmological probes such as the CMB and galaxy surveys, but can in principle be detected within GWB with upcoming and proposed gravitational wave experiments. Lastly, in Chapter 4, we focus on the detectability of GWB itself. We discuss a cosmological mechanism that can enhance the strength of the gravitational wave signal from phase transitions, thereby increasing their detection prospects significantly.
■590 ▼aSchool code: 0117.
■650 4▼aParticle physics.
■650 4▼aApplied physics.
■650 4▼aPhysics.
■653 ▼aCosmology
■653 ▼aDensity perturbations
■653 ▼aGravitational wave background
■653 ▼aInflation
■653 ▼aIsocurvature
■653 ▼aNon-Gaussianity
■653 ▼aCosmic Microwave Background
■690 ▼a0798
■690 ▼a0215
■690 ▼a0605
■71020▼aUniversity of Maryland, College Park▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-04B.
■773 ▼tDissertation Abstract International
■790 ▼a0117
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934323▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
