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Seven Dwarfs and Snow White: A Tale of Cosmological Co-Evolution of Low-Mass Galaxies and Their Host
Seven Dwarfs and Snow White: A Tale of Cosmological Co-Evolution of Low-Mass Galaxies and ...
Seven Dwarfs and Snow White: A Tale of Cosmological Co-Evolution of Low-Mass Galaxies and Their Host

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211153148
ISBN  
9798346384694
DDC  
300
저자명  
Wang, Yunchong.
서명/저자  
Seven Dwarfs and Snow White: A Tale of Cosmological Co-Evolution of Low-Mass Galaxies and Their Host
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
325 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Wechsler, Risa.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약Understanding the cosmos is a fundamental urge buried in humans, the urge to know the answer of where we came from and where we will go. Our view of the Universe encountered a major paradiagm shift in the early 20thcentury from a static Universe (Newton's theory) to an expanding Universe with the measurement of the Hubble's Law [213]. In such a Universe, rewinding time backwards would bring every point in the Universe back to a singularity where time began, the Big Bang [267]. Subsequent pivotal discoveries of the Cosmic Microwave Background [CMB, 366, 361, 42, 43, 376, 377], the abundance of light elements [98], and the Large Scale Structure of the Universe [106, 147, 534, 438, 2, 85] further consolidated the origin of the Universe from the Big Bang.In this expanding Universe, cold and hot patches in the CMB provide initial perturbations to overdense and underdense regions in the matter distribution as the Universe cools. The overdense perturbations subsequently collapse under gravity and form the large scale structure of the Universe, while underdense perturbations become voids. Since Vera Rubin's first measurement of the rotation curves of nearby galaxies [403] being far from Keplerian, it is known that luminous matter, a.k.a standard model particles [baryons, 2], only make up ≲ 20% of the total matter content in the Universe that can cause gravitational effects. The other ≳ 80% of matter, a.k.a. dark matter, behaves like a collisionless ideal gas and does not interact with light [latest dark matter-baryon interaction upper limits from 1]. The presence of dark matter at significant proportions however is highly-confident, due to its capability to simultaneously explain the angular correlation of the CMB, the rotation curves of galaxies, the spatial clustering of galaxies especially the Baryonic Acoustic Oscillations, BAO [133, 367, 107], and the presence of strong and weak gravitational lenses [e.g., 341].Galaxies, i.e.,ensembles of stars, have been the main luminous tracers of the elusive dark matter in the Universe. In modern definitions, the key difference between a galaxy and a star cluster [258, 182] is that the former is gravitationally bound by a dark matter halo and the later is bound by the selfgravity of stars and gas only. In the 1980s, there were two competing theories of dark matter that argued for opposite structure formation scenarios. In the case of hot or warm dark matter [59, 61], ultra-light particles like neutrinos constitutes the bulk mass of dark matter and would free stream at relativistic velocities in the early Universe, suppressing small scale structures [59]. The largest galaxy clusters would form first before fragmenting into smaller galaxies in a 'top down' fashion. In the cold dark matter (CDM) scenario [363, 58], the opposite happens as dark matter has negligible streaming velocity and primordial overdensities from the CMB can quickly collapse into small dark matter halos before hierarchically merging into larger galaxies in a 'bottom up' fashion. This model has shown agreements with the large-scale matter density distribution observations. It was also further corroborated by the COBE small scale CMB power spectrum [42] at about the same time that the 'bottom up' scenario was shown to be more favorable, with CDM pulling away as the leading dark matter theory.
일반주제명  
Stars & galaxies
일반주제명  
Astrophysics
일반주제명  
Star & galaxy formation
일반주제명  
Space telescopes
일반주제명  
Satellites
일반주제명  
Aerospace engineering
일반주제명  
Astronomy
일반주제명  
Optics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■24510▼aSeven  Dwarfs  and  Snow  White:  A  Tale  of  Cosmological  Co-Evolution  of  Low-Mass  Galaxies  and  Their  Host
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a325  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Wechsler,  Risa.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aUnderstanding  the  cosmos  is  a  fundamental  urge  buried  in  humans,  the  urge  to  know  the  answer  of  where  we  came  from  and  where  we  will  go.  Our  view  of  the  Universe  encountered  a  major  paradiagm  shift  in  the  early  20thcentury  from  a  static  Universe  (Newton's  theory)  to  an  expanding  Universe  with  the  measurement  of  the  Hubble's  Law  [213].  In  such  a  Universe,  rewinding  time  backwards  would  bring  every  point  in  the  Universe  back  to  a  singularity  where  time  began,  the  Big  Bang  [267].  Subsequent  pivotal  discoveries  of  the  Cosmic  Microwave  Background  [CMB,  366,  361,  42,  43,  376,  377],  the  abundance  of  light  elements  [98],  and  the  Large  Scale  Structure  of  the  Universe  [106,  147,  534,  438,  2,  85]  further  consolidated  the  origin  of  the  Universe  from  the  Big  Bang.In  this  expanding  Universe,  cold  and  hot  patches  in  the  CMB  provide  initial  perturbations  to  overdense  and  underdense  regions  in  the  matter  distribution  as  the  Universe  cools.  The  overdense  perturbations  subsequently  collapse  under  gravity  and  form  the  large  scale  structure  of  the  Universe,  while  underdense  perturbations  become  voids.  Since  Vera  Rubin's  first  measurement  of  the  rotation  curves  of  nearby  galaxies  [403]  being  far  from  Keplerian,  it  is  known  that  luminous  matter,  a.k.a  standard  model  particles  [baryons,  2],  only  make  up  ≲  20%  of  the  total  matter  content  in  the  Universe  that  can  cause  gravitational  effects.  The  other  ≳  80%  of  matter,  a.k.a.  dark  matter,  behaves  like  a  collisionless  ideal  gas  and  does  not  interact  with  light  [latest  dark  matter-baryon  interaction  upper  limits  from  1].  The  presence  of  dark  matter  at  significant  proportions  however  is  highly-confident,  due  to  its  capability  to  simultaneously  explain  the  angular  correlation  of  the  CMB,  the  rotation  curves  of  galaxies,  the  spatial  clustering  of  galaxies  especially  the  Baryonic  Acoustic  Oscillations,  BAO  [133,  367,  107],  and  the  presence  of  strong  and  weak  gravitational  lenses  [e.g.,  341].Galaxies,  i.e.,ensembles  of  stars,  have  been  the  main  luminous  tracers  of  the  elusive  dark  matter  in  the  Universe.  In  modern  definitions,  the  key  difference  between  a  galaxy  and  a  star  cluster  [258,  182]  is  that  the  former  is  gravitationally  bound  by  a  dark  matter  halo  and  the  later  is  bound  by  the  selfgravity  of  stars  and  gas  only.  In  the  1980s,  there  were  two  competing  theories  of  dark  matter  that  argued  for  opposite  structure  formation  scenarios.  In  the  case  of  hot  or  warm  dark  matter  [59,  61],  ultra-light  particles  like  neutrinos  constitutes  the  bulk  mass  of  dark  matter  and  would  free  stream  at  relativistic  velocities  in  the  early  Universe,  suppressing  small  scale  structures  [59].  The  largest  galaxy  clusters  would  form  first  before  fragmenting  into  smaller  galaxies  in  a  'top  down'  fashion.  In  the  cold  dark  matter  (CDM)  scenario  [363,  58],  the  opposite  happens  as  dark  matter  has  negligible  streaming  velocity  and  primordial  overdensities  from  the  CMB  can  quickly  collapse  into  small  dark  matter  halos  before  hierarchically  merging  into  larger  galaxies  in  a  'bottom  up'  fashion.  This  model  has  shown  agreements  with  the  large-scale  matter  density  distribution  observations.  It  was  also  further  corroborated  by  the  COBE  small  scale  CMB  power  spectrum  [42]  at  about  the  same  time  that  the  'bottom  up'  scenario  was  shown  to  be  more  favorable,  with  CDM  pulling  away  as  the  leading  dark  matter  theory.
■590    ▼aSchool  code:  0212.
■650  4▼aStars  &  galaxies
■650  4▼aAstrophysics
■650  4▼aStar  &  galaxy  formation
■650  4▼aSpace  telescopes
■650  4▼aSatellites
■650  4▼aAerospace  engineering
■650  4▼aAstronomy
■650  4▼aOptics
■690    ▼a0596
■690    ▼a0538
■690    ▼a0606
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■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165199▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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