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Galaxy Surveys as Probes of the Primordial Universe Opportunities and Challenges
Galaxy Surveys as Probes of the Primordial Universe Opportunities and Challenges
Galaxy Surveys as Probes of the Primordial Universe Opportunities and Challenges

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152123
ISBN  
9798342728539
DDC  
530
저자명  
Shiveshwarkar, Charuhas Waman.
서명/저자  
Galaxy Surveys as Probes of the Primordial Universe Opportunities and Challenges
발행사항  
[Sl] : State University of New York at Stony Brook, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
110 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Loverde, Marilena;Essig, Roven.
학위논문주기  
Thesis (Ph.D.)--State University of New York at Stony Brook, 2024.
초록/해제  
요약Observations of the Large-Scale Structure (LSS) of the universe have emerged as a powerful probe of the physics of cosmic inflation. Upcoming LSS surveys can be particularly useful in constraining primordial non-Gaussianity (PnG) which is an important signature of all but the simplest models of cosmic inflation. Constraints on PnG can potentially distinguish between different inflationary models and provide invaluable insight into the generation of primordial fluctuations which seed the rich structure of the universe. On the other hand, the non-linear nature of structure-formation makes it harder to fully exploit the data collected by LSS surveys.A robust detection of a non-trivial local PnG (LPnG) implies the existence of an additional massless degree of freedom during inflation. LPnG is particularly amenable to detection by large-scale galaxy surveys as its observable signal peaks at the largest scales, where galaxy clustering can be adequately described by a linear/perturbative bias expansion and is modulated predominantly by inflationary effects. However, post-inflationary effects can also modulate galaxy clustering on the largest observable scales, and serve as important theoretical systematics. Although sub-dominant to their inflationary counterparts, they can significantly bias constraints on LPnG obtained from large-scale galaxy surveys.In this dissertation, we explore the potential of upcoming large-scale galaxy surveys to constrain LPnG. We begin by exploring the constraining power of the upcoming SPHEREx all-sky survey in constraining LPnG beyond the simplest scenario of a non-trivial primordial bispectrum. We obtain a Markov Chain Monte Carlo (MCMC) forecast to assess how well the SPHEREx all-sky survey can constrain LPnG parameters fNL, gNL and τNL from galaxy power spectra. We then proceed to investigate the effect of some post-inflationary systematics that can affect constraints on LPnG. Using Separate Universe simulations, we model the large-scale modulation of galaxy clustering by the free-streaming of light relics. We then analyse how the free-streaming of light relics and fluctuations in the background of ionising radiation can bias forecast constraints on fNL obtained from galaxy power spectra. In this way, we quantify their importance as theoretical systematics relevant for large-scale galaxy surveys seeking to constrain LPnG.
일반주제명  
Physics
일반주제명  
Theoretical physics
일반주제명  
Astronomy
일반주제명  
Astrophysics
키워드  
Cosmological forecasts
키워드  
Inflationary cosmology
키워드  
Large-Scale Structure
키워드  
Primordial non-Gaussianity
기타저자  
State University of New York at Stony Brook Physics
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aShiveshwarkar,  Charuhas  Waman.
■24510▼aGalaxy  Surveys  as  Probes  of  the  Primordial  Universe  Opportunities  and  Challenges
■260    ▼a[Sl]▼bState  University  of  New  York  at  Stony  Brook▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a110  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Loverde,  Marilena;Essig,  Roven.
■5021  ▼aThesis  (Ph.D.)--State  University  of  New  York  at  Stony  Brook,  2024.
■520    ▼aObservations  of  the  Large-Scale  Structure  (LSS)  of  the  universe  have  emerged  as  a  powerful  probe  of  the  physics  of  cosmic  inflation.  Upcoming  LSS  surveys  can  be  particularly  useful  in  constraining  primordial  non-Gaussianity  (PnG)  which  is  an  important  signature  of  all  but  the  simplest  models  of  cosmic  inflation.  Constraints  on  PnG  can  potentially  distinguish  between  different  inflationary  models  and  provide  invaluable  insight  into  the  generation  of  primordial  fluctuations  which  seed  the  rich  structure  of  the  universe.  On  the  other  hand,  the  non-linear  nature  of  structure-formation  makes  it  harder  to  fully  exploit  the  data  collected  by  LSS  surveys.A  robust  detection  of  a  non-trivial  local  PnG  (LPnG)  implies  the  existence  of  an  additional  massless  degree  of  freedom  during  inflation.  LPnG  is  particularly  amenable  to  detection  by  large-scale  galaxy  surveys  as  its  observable  signal  peaks  at  the  largest  scales,  where  galaxy  clustering  can  be  adequately  described  by  a  linear/perturbative  bias  expansion  and  is  modulated  predominantly  by  inflationary  effects.  However,  post-inflationary  effects  can  also  modulate  galaxy  clustering  on  the  largest  observable  scales,  and  serve  as  important  theoretical  systematics.  Although  sub-dominant  to  their  inflationary  counterparts,  they  can  significantly  bias  constraints  on  LPnG  obtained  from  large-scale  galaxy  surveys.In  this  dissertation,  we  explore  the  potential  of  upcoming  large-scale  galaxy  surveys  to  constrain  LPnG.  We  begin  by  exploring  the  constraining  power  of  the  upcoming  SPHEREx  all-sky  survey  in  constraining  LPnG  beyond  the  simplest  scenario  of  a  non-trivial  primordial  bispectrum.  We  obtain  a  Markov  Chain  Monte  Carlo  (MCMC)  forecast  to  assess  how  well  the  SPHEREx  all-sky  survey  can  constrain  LPnG  parameters  fNL,  gNL  and  τNL  from  galaxy  power  spectra.  We  then  proceed  to  investigate  the  effect  of  some  post-inflationary  systematics  that  can  affect  constraints  on  LPnG.  Using  Separate  Universe  simulations,  we  model  the  large-scale  modulation  of  galaxy  clustering  by  the  free-streaming  of  light  relics.  We  then  analyse  how  the  free-streaming  of  light  relics  and  fluctuations  in  the  background  of  ionising  radiation  can  bias  forecast  constraints  on  fNL  obtained  from  galaxy  power  spectra.  In  this  way,  we  quantify  their  importance  as  theoretical  systematics  relevant  for  large-scale  galaxy  surveys  seeking  to  constrain  LPnG.
■590    ▼aSchool  code:  0771.
■650  4▼aPhysics
■650  4▼aTheoretical  physics
■650  4▼aAstronomy
■650  4▼aAstrophysics
■653    ▼aCosmological  forecasts
■653    ▼aInflationary  cosmology
■653    ▼aLarge-Scale  Structure
■653    ▼aPrimordial  non-Gaussianity
■690    ▼a0605
■690    ▼a0753
■690    ▼a0606
■690    ▼a0596
■71020▼aState  University  of  New  York  at  Stony  Brook▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0771
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163006▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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