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Quantum Evolution: Black Holes, Gravitational Dressing, and General Backgrounds
Quantum Evolution: Black Holes, Gravitational Dressing, and General Backgrounds
Quantum Evolution: Black Holes, Gravitational Dressing, and General Backgrounds

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자료유형  
 학위논문 서양
최종처리일시  
20250211152840
ISBN  
9798342719940
DDC  
530
저자명  
Perkins, Julie.
서명/저자  
Quantum Evolution: Black Holes, Gravitational Dressing, and General Backgrounds
발행사항  
[Sl] : University of California, Santa Barbara, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
125 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Giddings, Steven B.
학위논문주기  
Thesis (Ph.D.)--University of California, Santa Barbara, 2024.
초록/해제  
요약The full theory of Quantum Gravity (QG) that unites gravity and quantum mechanics has not yet been discovered. One of the pressing issues is to correctly account for unitarity in quantum mechanical processes, even on a static curved spacetime. The presence of black holes in particular leads to profound issues with unitary evolution and locality. Though Hawking radiation and gravitational interactions are well studied in the Heisenberg picture, this work uses the Schrodinger picture to examine their evolution. Through the ADM decomposition and the associated Hamiltonian we can study the Schrodinger picture, and define the unitary time evolution operator, as in regular quantum mechanics. By carefully examining the Schrodinger picture, we aim to provide a clearer understanding of QG, and defer the study of changes needed to unitarize the theory to later work. This thesis focuses in particular on massless scalar fields propagating on curved spacetimes of dimension D ≥ 4. The simplicity of the scalar field is a useful test case, and we expect to be able to generalize to other, more complicated fields. First, Hawking radiation is studied for Schwarzschild black holes in the Schr¨odinger picture. Using the ADM decomposition, "nice slices" are introduced, which are smooth foliations of the spacetime that are regular across the horizon, rather than the more typical singular ones involving tortoise coordinates. The role of ultra high energy Hawking modes is discussed, and these are found to be a result of the choice of singular coordinates used near the horizon, rather than an indication of transplanckian physics occurring on the horizon scale. In addition, the constraint equations, which are the ADM decomposition of the Einstein equations, are expanded to second order in κ = √ 32πG in an arbitrary background spacetime. Observable operators are "dressed" in their gravitational fields, in analogy with the description from quantum field theories, and the creation of such an operator makes an associated field which extends to infinity. A general form for the gravitational dressing is found to leading order using the expansion of the constraint equations.
일반주제명  
Physics
일반주제명  
Quantum physics
일반주제명  
Mechanics
키워드  
Black holes
키워드  
Gravitational dressing
키워드  
Quantum Gravity
키워드  
Quantum mechanics
기타저자  
University of California, Santa Barbara Physics
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798342719940
■035    ▼a(MiAaPQ)AAI31562231
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aPerkins,  Julie.
■24510▼aQuantum  Evolution:  Black  Holes,  Gravitational  Dressing,  and  General  Backgrounds
■260    ▼a[Sl]▼bUniversity  of  California,  Santa  Barbara▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a125  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Giddings,  Steven  B.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Santa  Barbara,  2024.
■520    ▼aThe  full  theory  of  Quantum  Gravity  (QG)  that  unites  gravity  and  quantum  mechanics  has  not  yet  been  discovered.  One  of  the  pressing  issues  is  to  correctly  account  for  unitarity  in  quantum  mechanical  processes,  even  on  a  static  curved  spacetime.  The  presence  of  black  holes  in  particular  leads  to  profound  issues  with  unitary  evolution  and  locality.  Though  Hawking  radiation  and  gravitational  interactions  are  well  studied  in  the  Heisenberg  picture,  this  work  uses  the  Schrodinger  picture  to  examine  their  evolution.  Through  the  ADM  decomposition  and  the  associated  Hamiltonian  we  can  study  the  Schrodinger  picture,  and  define  the  unitary  time  evolution  operator,  as  in  regular  quantum  mechanics.  By  carefully  examining  the  Schrodinger  picture,  we  aim  to  provide  a  clearer  understanding  of  QG,  and  defer  the  study  of  changes  needed  to  unitarize  the  theory  to  later  work.  This  thesis  focuses  in  particular  on  massless  scalar  fields  propagating  on  curved  spacetimes  of  dimension  D  ≥  4.  The  simplicity  of  the  scalar  field  is  a  useful  test  case,  and  we  expect  to  be  able  to  generalize  to  other,  more  complicated  fields.  First,  Hawking  radiation  is  studied  for  Schwarzschild  black  holes  in  the  Schr¨odinger  picture.  Using  the  ADM  decomposition,  "nice  slices"  are  introduced,  which  are  smooth  foliations  of  the  spacetime  that  are  regular  across  the  horizon,  rather  than  the  more  typical  singular  ones  involving  tortoise  coordinates.  The  role  of  ultra  high  energy  Hawking  modes  is  discussed,  and  these  are  found  to  be  a  result  of  the  choice  of  singular  coordinates  used  near  the  horizon,  rather  than  an  indication  of  transplanckian  physics  occurring  on  the  horizon  scale.  In  addition,  the  constraint  equations,  which  are  the  ADM  decomposition  of  the  Einstein  equations,  are  expanded  to  second  order  in  κ  =  √  32πG  in  an  arbitrary  background  spacetime.  Observable  operators  are  "dressed"  in  their  gravitational  fields,  in  analogy  with  the  description  from  quantum  field  theories,  and  the  creation  of  such  an  operator  makes  an  associated  field  which  extends  to  infinity.  A  general  form  for  the  gravitational  dressing  is  found  to  leading  order  using  the  expansion  of  the  constraint  equations.
■590    ▼aSchool  code:  0035.
■650  4▼aPhysics
■650  4▼aQuantum  physics
■650  4▼aMechanics
■653    ▼aBlack  holes
■653    ▼aGravitational  dressing
■653    ▼aQuantum  Gravity
■653    ▼aQuantum  mechanics
■690    ▼a0605
■690    ▼a0346
■690    ▼a0599
■71020▼aUniversity  of  California,  Santa  Barbara▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0035
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164173▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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