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Towards Accurate Cosmology From CMB Secondaries and Large-Scale Structure Surveys
Towards Accurate Cosmology From CMB Secondaries and Large-Scale Structure Surveys
Towards Accurate Cosmology From CMB Secondaries and Large-Scale Structure Surveys

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105101
ISBN  
9798293892945
DDC  
530
저자명  
Sailer, Noah.
서명/저자  
Towards Accurate Cosmology From CMB Secondaries and Large-Scale Structure Surveys
발행사항  
[Sl] : University of California, Berkeley, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
392 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: White, Martin;Ferraro, Simone.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2025.
초록/해제  
요약The past decade has seen the rise of high-precision cosmological observations accompanied by emerging tensions among various datasets when interpreted within the standard cosmological model (ΛCDM). We investigate how joint analyses of secondary anisotropies in the cosmic microwave background (CMB) and large-scale structure (LSS) surveys can be leveraged to improve the robustness of cosmological inference. In Part I, we develop novel methods for mitigating foreground contamination in CMB lensing reconstruction. Extragalactic foregrounds such as the thermal Sunyaev-Zel'dovich (tSZ) effect and the cosmic infrared background (CIB) can bias lensing estimators, particularly on small scales. We construct bias-hardened quadratic estimators, both in temperature and polarization, that null specific foreground profiles with minimal degradation in signalto-noise. We further generalize temperature-based shear estimators to polarization, finding that the shear-only estimator is a special case of a more general class of large-lens-suppressed estimators. In tandem, we explore optimal multifrequency methods, quantifying the tradeoffs between noise and bias in the presence of extragalactic foregrounds.Part II applies these tools to current datasets, addressing a subset of the aforementioned tensions. We perform a cross-correlation analysis of the latest CMB lensing maps from Planck and ACT with the DESI legacy imaging data, yielding tomographic constraints on linear structure growth. We find overall consistency with ΛCDM, both in the overall amplitude and time-evolution of structure growth. We then present methods to mitigate lensing biases in the mean patchy screening signal around DESI galaxies and show that, when these biases are taken into account, patchy screening is consistent with the baryon distribution inferred from the kinetic SZ effect. Finally, we quantify the impact of the optical depth τ on parameter inference from the CMB, arguing that a higher value of τ would alleviate the preference for beyond-ΛCDM physics by current CMB and BAO data.Part III projects forward to the next generation of large-scale structure surveys. We demonstrate that combining high-redshift galaxy surveys with CMB data from Simons Observatory or a stage-4 CMB survey will enable percent-level constraints on the neutrino mass sum, curvature, light relics, the expansion and growth histories, (early) dark energy, modified gravity and primordial non-Gaussianity. A new method is proposed for using 21 cm clustering to measure τ independently of large-scale CMB measurements. It is shown that future 21 cm interferometers have the potential to measure τ to a higher precision than a cosmic-variance limited CMB survey while at the same time mitigating biases arising from the miss-modeling of the small-scale astrophysics relevant for reionization.Altogether, this work advances the extraction of cosmological information from secondary CMB effects and LSS, addresses key theoretical and observational systematics, and lays a foundation for robust analyses from upcoming datasets.
일반주제명  
Physics
일반주제명  
Astronomy
일반주제명  
Astrophysics
키워드  
Cosmic microwave background
키워드  
Cosmology
키워드  
Gravitational lensing
키워드  
Large-scale structure
기타저자  
University of California, Berkeley Physics
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aSailer,  Noah.
■24510▼aTowards  Accurate  Cosmology  From  CMB  Secondaries  and  Large-Scale  Structure  Surveys
■260    ▼a[Sl]▼bUniversity  of  California,  Berkeley▼c2025
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■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  White,  Martin;Ferraro,  Simone.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Berkeley,  2025.
■520    ▼aThe  past  decade  has  seen  the  rise  of  high-precision  cosmological  observations  accompanied  by  emerging  tensions  among  various  datasets  when  interpreted  within  the  standard  cosmological  model  (ΛCDM).  We  investigate  how  joint  analyses  of  secondary  anisotropies  in  the  cosmic  microwave  background  (CMB)  and  large-scale  structure  (LSS)  surveys  can  be  leveraged  to  improve  the  robustness  of  cosmological  inference. In  Part  I,  we  develop  novel  methods  for  mitigating  foreground  contamination  in  CMB  lensing  reconstruction.  Extragalactic  foregrounds  such  as  the  thermal  Sunyaev-Zel'dovich  (tSZ)  effect  and  the  cosmic  infrared  background  (CIB)  can  bias  lensing  estimators,  particularly  on  small  scales.  We  construct  bias-hardened  quadratic  estimators,  both  in  temperature  and  polarization,  that  null  specific  foreground  profiles  with  minimal  degradation  in  signalto-noise.  We  further  generalize  temperature-based  shear  estimators  to  polarization,  finding  that  the  shear-only  estimator  is  a  special  case  of  a  more  general  class  of  large-lens-suppressed  estimators.  In  tandem,  we  explore  optimal  multifrequency  methods,  quantifying  the  tradeoffs  between  noise  and  bias  in  the  presence  of  extragalactic  foregrounds.Part  II  applies  these  tools  to  current  datasets,  addressing  a  subset  of  the  aforementioned  tensions.  We  perform  a  cross-correlation  analysis  of  the  latest  CMB  lensing  maps  from  Planck  and  ACT  with  the  DESI  legacy  imaging  data,  yielding  tomographic  constraints  on  linear  structure  growth.  We  find  overall  consistency  with  ΛCDM,  both  in  the  overall  amplitude  and  time-evolution  of  structure  growth.  We  then  present  methods  to  mitigate  lensing  biases  in  the  mean  patchy  screening  signal  around  DESI  galaxies  and  show  that,  when  these  biases  are  taken  into  account,  patchy  screening  is  consistent  with  the  baryon  distribution  inferred  from  the  kinetic  SZ  effect.  Finally,  we  quantify  the  impact  of  the  optical  depth  τ  on  parameter  inference  from  the  CMB,  arguing  that  a  higher  value  of  τ  would  alleviate  the  preference  for  beyond-ΛCDM  physics  by  current  CMB  and  BAO  data.Part  III  projects  forward  to  the  next  generation  of  large-scale  structure  surveys.  We  demonstrate  that  combining  high-redshift  galaxy  surveys  with  CMB  data  from  Simons  Observatory  or  a  stage-4  CMB  survey  will  enable  percent-level  constraints  on  the  neutrino  mass  sum,  curvature,  light  relics,  the  expansion  and  growth  histories,  (early)  dark  energy,  modified  gravity  and  primordial  non-Gaussianity.  A  new  method  is  proposed  for  using  21  cm  clustering  to  measure  τ  independently  of  large-scale  CMB  measurements.  It  is  shown  that  future  21  cm  interferometers  have  the  potential  to  measure  τ  to  a  higher  precision  than  a  cosmic-variance  limited  CMB  survey  while  at  the  same  time  mitigating  biases  arising  from  the  miss-modeling  of  the  small-scale  astrophysics  relevant  for  reionization.Altogether,  this  work  advances  the  extraction  of  cosmological  information  from  secondary  CMB  effects  and  LSS,  addresses  key  theoretical  and  observational  systematics,  and  lays  a  foundation  for  robust  analyses  from  upcoming  datasets.
■590    ▼aSchool  code:  0028.
■650  4▼aPhysics
■650  4▼aAstronomy
■650  4▼aAstrophysics
■653    ▼aCosmic  microwave  background
■653    ▼aCosmology
■653    ▼aGravitational  lensing
■653    ▼aLarge-scale  structure
■690    ▼a0605
■690    ▼a0606
■690    ▼a0596
■71020▼aUniversity  of  California,  Berkeley▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0028
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359322▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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