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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-Ca...
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  
Large scale structure
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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■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.

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