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From Shapes to S8: Extracting Precision Cosmological Constraints from the Hyper Suprime-Cam Galaxy Survey
From Shapes to S8: Extracting Precision Cosmological Constraints from the Hyper Suprime-Cam Galaxy Survey
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151009
- ISBN
- 9798382808536
- DDC
- 523
- 저자명
- Dalal, Roohi.
- 서명/저자
- From Shapes to S8: Extracting Precision Cosmological Constraints from the Hyper Suprime-Cam Galaxy Survey
- 발행사항
- [Sl] : Princeton University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 184 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Strauss, Michael A.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2024.
- 초록/해제
- 요약In this dissertation I present cosmological parameter constraints from the Hyper Suprime-Cam Subaru Strategic Program (HSC SSP), obtained using weak gravitational lensing, specifically cosmic shear angular power spectra. I begin with an overview of weak gravitational lensing and cosmic shear, as well as a description of the HSC survey. I then describe the measurement of cosmic shear power spectra from the HSC Y3 data, including the estimation of galaxy shears, our methodology to prevent confirmation bias, the Pseudo-Cl method used to obtain unbiased power spectra, the estimation of the covariance matrix and the validation and null tests carried out on our measured spectra. I then discuss in detail the contamination to the power spectrum measurement from point spread function (PSF) systematics, highlighting a novel methodology to measure and model the impact of both second and fourth moments of the PSF on the power spectrum and inferred cosmological parameters. I also describe systematics arising from the measurement of the source redshift distribution, discussing our estimation of individual galaxy photometric redshifts and the underlying source redshift distribution, as well as our modeling of the uncertainties in the latter in our cosmological analysis. I highlight a key finding from the HSC Y3 cosmology analyses, namely evidence of a systematic bias in the inferred source redshift distributions at z1, and discuss how this is corrected for in our cosmological analysis, and the work that is necessary to mitigate this issue for future surveys and cosmological analyses. I then describe our fiducial cosmological analysis, and the resulting parameter constraints, focusing on the measured value of S8, which is 2-sigma lower than the constraint from primary CMB measurements, lending credence to the apparent S8 tension observed by other weak lensing surveys. I conclude by discussing the potential for baryonic feedback modeling to be the source of the S8 tension, and show how jointly optimizing the scale cuts and baryonic model complexity will enable unbiased, high-precision cosmological constraints from future data sets.
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Particle physics
- 키워드
- Cosmology
- 키워드
- Weak lensing
- 기타저자
- Princeton University Astrophysical Sciences
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151009
■006m o d
■007cr#unu||||||||
■020 ▼a9798382808536
■035 ▼a(MiAaPQ)AAI30995344
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aDalal, Roohi.▼0(orcid)0000-0002-7998-9899
■24510▼aFrom Shapes to S8: Extracting Precision Cosmological Constraints from the Hyper Suprime-Cam Galaxy Survey
■260 ▼a[Sl]▼bPrinceton University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a184 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Strauss, Michael A.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2024.
■520 ▼aIn this dissertation I present cosmological parameter constraints from the Hyper Suprime-Cam Subaru Strategic Program (HSC SSP), obtained using weak gravitational lensing, specifically cosmic shear angular power spectra. I begin with an overview of weak gravitational lensing and cosmic shear, as well as a description of the HSC survey. I then describe the measurement of cosmic shear power spectra from the HSC Y3 data, including the estimation of galaxy shears, our methodology to prevent confirmation bias, the Pseudo-Cl method used to obtain unbiased power spectra, the estimation of the covariance matrix and the validation and null tests carried out on our measured spectra. I then discuss in detail the contamination to the power spectrum measurement from point spread function (PSF) systematics, highlighting a novel methodology to measure and model the impact of both second and fourth moments of the PSF on the power spectrum and inferred cosmological parameters. I also describe systematics arising from the measurement of the source redshift distribution, discussing our estimation of individual galaxy photometric redshifts and the underlying source redshift distribution, as well as our modeling of the uncertainties in the latter in our cosmological analysis. I highlight a key finding from the HSC Y3 cosmology analyses, namely evidence of a systematic bias in the inferred source redshift distributions at z1, and discuss how this is corrected for in our cosmological analysis, and the work that is necessary to mitigate this issue for future surveys and cosmological analyses. I then describe our fiducial cosmological analysis, and the resulting parameter constraints, focusing on the measured value of S8, which is 2-sigma lower than the constraint from primary CMB measurements, lending credence to the apparent S8 tension observed by other weak lensing surveys. I conclude by discussing the potential for baryonic feedback modeling to be the source of the S8 tension, and show how jointly optimizing the scale cuts and baryonic model complexity will enable unbiased, high-precision cosmological constraints from future data sets.
■590 ▼aSchool code: 0181.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aParticle physics
■653 ▼aCosmology
■653 ▼aLarge scale structure
■653 ▼aWeak lensing
■690 ▼a0596
■690 ▼a0798
■690 ▼a0606
■71020▼aPrinceton University▼bAstrophysical Sciences.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160390▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


