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Precision Shear Calibration for Cosmology with Current and Future Galaxy Surveys
Precision Shear Calibration for Cosmology with Current and Future Galaxy Surveys
Precision Shear Calibration for Cosmology with Current and Future Galaxy Surveys

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105622
ISBN  
9798265428585
DDC  
523.01
저자명  
Mau, Sidney David.
서명/저자  
Precision Shear Calibration for Cosmology with Current and Future Galaxy Surveys
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
197 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Burchat, Patricia.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약Weak lensing, amongst the most sensitive probes of dark matter and dark energy, is a premier measurement for galaxy surveys including the Dark Energy Survey (DES) and the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST). As the statistical power of such surveys continues to improve, the requirements on understanding and minimizing the systematic uncertainties in cosmic shear measurement and calibration become ever more stringent. Therefore, developing measurement algorithms and calibrations for cosmic shear is critical to achieving precise and unbiased constraints on cosmological parameters.In this thesis, I review weak lensing, cosmic shear, and the development of both measurement and calibration techniques. I present the image simulations and shear calibration for the DES six-year cosmic shear dataset, demonstrating excellent control of systematic uncertainties for more than 150,000,000 galaxies spanning 4,422 square degrees of the southern sky. The simulations and calibration correct for the dominant sources of shear bias, including the effects of source detection, star-galaxy confusion, object and area masking, chromatic point-spread functions, and blending between galaxies of different redshifts. I describe studies of the effect of chromatic point-spread functions on shear calibration including the use of image simulations to quantify the resulting systematic uncertainty and the derivation of a method to calibrate this bias for future surveys such as LSST. Finally, I demonstrate the use of observations of the Milky Way satellite galaxy population to infer constraints on a model of decaying dark matter.
일반주제명  
Dark matter
일반주제명  
Stars & galaxies
일반주제명  
Spacetime
일반주제명  
Theory of relativity
일반주제명  
Satellites
일반주제명  
20th century
일반주제명  
Radiation
일반주제명  
Dark energy
일반주제명  
Universe
일반주제명  
Cosmology
일반주제명  
Aerospace engineering
일반주제명  
Astronomy
일반주제명  
Astrophysics
일반주제명  
Theoretical physics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■006m          o    d                
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■020    ▼a9798265428585
■035    ▼a(MiAaPQ)AAI32316513
■035    ▼a(MiAaPQ)Stanfordmd622jp3123
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523.01
■1001  ▼aMau,  Sidney  David.
■24510▼aPrecision  Shear  Calibration  for  Cosmology  with  Current  and  Future  Galaxy  Surveys
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a197  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Burchat,  Patricia.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼aWeak  lensing,  amongst  the  most  sensitive  probes  of  dark  matter  and  dark  energy,  is  a  premier  measurement  for  galaxy  surveys  including  the  Dark  Energy  Survey  (DES)  and  the  Vera  C.  Rubin  Observatory's  Legacy  Survey  of  Space  and  Time  (LSST).  As  the  statistical  power  of  such  surveys  continues  to  improve,  the  requirements  on  understanding  and  minimizing  the  systematic  uncertainties  in  cosmic  shear  measurement  and  calibration  become  ever  more  stringent.  Therefore,  developing  measurement  algorithms  and  calibrations  for  cosmic  shear  is  critical  to  achieving  precise  and  unbiased  constraints  on  cosmological  parameters.In  this  thesis,  I  review  weak  lensing,  cosmic  shear,  and  the  development  of  both  measurement  and  calibration  techniques.  I  present  the  image  simulations  and  shear  calibration  for  the  DES  six-year  cosmic  shear  dataset,  demonstrating  excellent  control  of  systematic  uncertainties  for  more  than  150,000,000  galaxies  spanning  4,422  square  degrees  of  the  southern  sky.  The  simulations  and  calibration  correct  for  the  dominant  sources  of  shear  bias,  including  the  effects  of  source  detection,  star-galaxy  confusion,  object  and  area  masking,  chromatic  point-spread  functions,  and  blending  between  galaxies  of  different  redshifts.  I  describe  studies  of  the  effect  of  chromatic  point-spread  functions  on  shear  calibration  including  the  use  of  image  simulations  to  quantify  the  resulting  systematic  uncertainty  and  the  derivation  of  a  method  to  calibrate  this  bias  for  future  surveys  such  as  LSST.  Finally,  I  demonstrate  the  use  of  observations  of  the  Milky  Way  satellite  galaxy  population  to  infer  constraints  on  a  model  of  decaying  dark  matter.
■590    ▼aSchool  code:  0212.
■650  4▼aDark  matter
■650  4▼aStars  &  galaxies
■650  4▼aSpacetime
■650  4▼aTheory  of  relativity
■650  4▼aSatellites
■650  4▼a20th  century
■650  4▼aRadiation
■650  4▼aDark  energy
■650  4▼aUniverse
■650  4▼aCosmology
■650  4▼aAerospace  engineering
■650  4▼aAstronomy
■650  4▼aAstrophysics
■650  4▼aTheoretical  physics
■690    ▼a0538
■690    ▼a0606
■690    ▼a0596
■690    ▼a0753
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360805▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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