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Axionic Blue Isocurvature Perturbations: Generation and Forecast
Axionic Blue Isocurvature Perturbations: Generation and Forecast
Axionic Blue Isocurvature Perturbations: Generation and Forecast

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152006
ISBN  
9798382836508
DDC  
530
저자명  
Tadepalli, Sai Chaitanya.
서명/저자  
Axionic Blue Isocurvature Perturbations: Generation and Forecast
발행사항  
[Sl] : The University of Wisconsin - Madison, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
430 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Chung, Daniel J. H.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
초록/해제  
요약When additional degrees of freedom are considered during inflation, a crucial aspect of early-universe physics emerges: the generation of isocurvature quantum fluctuations, akin to independent quantum perturbations. These fluctuations can offer valuable insights into inflation and the presence of spectator fields and their mass scales. Current data tightly constrains the cold dark matter (CDM) isocurvature amplitude on length scales ≳ O(10) Mpc. However, blue-tilted isocurvatures can be invisible on large scales and leave a huge imprint on small scales. This thesis delves into the generation and forecast of blue-tilted isocurvature perturbations for the axion dark matter. In the first part of the thesis, we study the generation of CDM uncorrelated blue-tilted isocurvature for the axions when the axionic sector is far out of equilibrium during inflation through an initial Peccei-Quinn symmetry breaking field displacement. We examine two distinct models where the blue-tilted fluctuations originate during the dynamical evolution of the background radial field through the quadratic and quartic components of the effective potentials, respectively. In the first model, we identify parametric regions exhibiting strong resonant spectral behavior leading to diverse isocurvature spectral shapes. The nonlinearity-driven resonance results in a chaotic mapping between the underlying Lagrangian parameters and the isocurvature amplitudes. In the second scenario, we propose a novel method to generate the blue-tilted spectrum over a large range of scales by utilizing the classical conformal limit via a non-zero conserved charge to slow down the rolling of the radial field.In the second part, we present a Fisher forecast for the Euclid and MegaMapper experiments in their ability to detect blue-tilted isocurvature perturbations. We construct the theoretical predictions in the EFTofLSS and bias formalisms, revealing promising outcomes that underscore the potential for detecting the CDM blue isocurvature amplitude in forthcoming surveys.
일반주제명  
Physics
일반주제명  
Astrophysics
일반주제명  
Quantum physics
일반주제명  
Astronomy
키워드  
Axions
키워드  
Cosmology
키워드  
Isocurvature
키워드  
Large-scale structures
키워드  
Cold dark matter
기타저자  
The University of Wisconsin - Madison Physics
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008250123s2024        us                              c    eng  d
■001000017162385
■00520250211152006
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798382836508
■035    ▼a(MiAaPQ)AAI31330607
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aTadepalli,  Sai  Chaitanya.
■24510▼aAxionic  Blue  Isocurvature  Perturbations:  Generation  and  Forecast
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a430  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Chung,  Daniel  J.  H.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2024.
■520    ▼aWhen  additional  degrees  of  freedom  are  considered  during  inflation,  a  crucial  aspect  of  early-universe  physics  emerges:  the  generation  of  isocurvature  quantum  fluctuations,  akin  to  independent  quantum  perturbations.  These  fluctuations  can  offer  valuable  insights  into  inflation  and  the  presence  of  spectator  fields  and  their  mass  scales.  Current  data  tightly  constrains  the  cold  dark  matter  (CDM)  isocurvature  amplitude  on  length  scales  ≳  O(10)  Mpc.  However,  blue-tilted  isocurvatures  can  be  invisible  on  large  scales  and  leave  a  huge  imprint  on  small  scales.  This  thesis  delves  into  the  generation  and  forecast  of  blue-tilted  isocurvature  perturbations  for  the  axion  dark  matter.  In  the  first  part  of  the  thesis,  we  study  the  generation  of  CDM  uncorrelated  blue-tilted  isocurvature  for  the  axions  when  the  axionic  sector  is  far  out  of  equilibrium  during  inflation  through  an  initial  Peccei-Quinn  symmetry  breaking  field  displacement.  We  examine  two  distinct  models  where  the  blue-tilted  fluctuations  originate  during  the  dynamical  evolution  of  the  background  radial  field  through  the  quadratic  and  quartic  components  of  the  effective  potentials,  respectively.  In  the  first  model,  we  identify  parametric  regions  exhibiting  strong  resonant  spectral  behavior  leading  to  diverse  isocurvature  spectral  shapes.  The  nonlinearity-driven  resonance  results  in  a  chaotic  mapping  between  the  underlying  Lagrangian  parameters  and  the  isocurvature  amplitudes.  In  the  second  scenario,  we  propose  a  novel  method  to  generate  the  blue-tilted  spectrum  over  a  large  range  of  scales  by  utilizing  the  classical  conformal  limit  via  a  non-zero  conserved  charge  to  slow  down  the  rolling  of  the  radial  field.In  the  second  part,  we  present  a  Fisher  forecast  for  the  Euclid  and  MegaMapper  experiments  in  their  ability  to  detect  blue-tilted  isocurvature  perturbations.  We  construct  the  theoretical  predictions  in  the  EFTofLSS  and  bias  formalisms,  revealing  promising  outcomes  that  underscore  the  potential  for  detecting  the  CDM  blue  isocurvature  amplitude  in  forthcoming  surveys.
■590    ▼aSchool  code:  0262.
■650  4▼aPhysics
■650  4▼aAstrophysics
■650  4▼aQuantum  physics
■650  4▼aAstronomy
■653    ▼aAxions
■653    ▼aCosmology
■653    ▼aIsocurvature
■653    ▼aLarge-scale  structures
■653    ▼aCold  dark  matter  
■690    ▼a0605
■690    ▼a0599
■690    ▼a0596
■690    ▼a0606
■71020▼aThe  University  of  Wisconsin  -  Madison▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162385▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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