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Thermodynamics of Quantum Gravitational Ensembles- [electronic resource]
Thermodynamics of Quantum Gravitational Ensembles - [electronic resource]
Thermodynamics of Quantum Gravitational Ensembles- [electronic resource]

Detailed Information

자료유형  
 학위논문파일 국외
최종처리일시  
20240214101553
ISBN  
9798380580885
DDC  
530
저자명  
Banihashemi, Batoul.
서명/저자  
Thermodynamics of Quantum Gravitational Ensembles - [electronic resource]
발행사항  
[S.l.]: : University of Maryland, College Park., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(206 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
주기사항  
Advisor: Jacobson, Theodore.
학위논문주기  
Thesis (Ph.D.)--University of Maryland, College Park, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약The discovery of black hole thermodynamics and its extension to cosmological horizons demonstrated a deep connection between thermodynamics and the nature of spacetime as a quantum system. It is then of great importance to properly understand the statistical mechanics of gravitational systems with horizon from first principles. While employing a partition function and the gravitational "Euclidean path integral" produces the expected physical result for entropy, a number of fundamental questions about the underlying analysis persist. This dissertation sharpens and resolves some puzzles regarding statistical mechanics of gravitational ensembles and the gravitational path integral, with a focus on cosmological horizons and de Sitter space. The main questions addressed in this dissertation are: how is the entropy of de Sitter space derived in absence of any boundary on which the statistical ensemble can be properly defined? What is the correct interpretation of the first law of de Sitter horizon, according to which the horizon area shrinks upon adding matter in de Sitter static patch? And finally, can entropy of horizon-bounded systems be derived from a Hamiltonian approach and phase space path integral, without the trickery of the gravitational Euclidean path integral? The first two questions are answered by introducing an artificial boundary in the system on which a gravitational ensemble can be properly defined. Once the ensemble is defined, the semiclassical approximation of the statistical partition function yields the entropy, and the interpretation of the de Sitter first law becomes clear by identifying the system energy as the quasilocal energy defined on the boundary. To tackle the last question, the real-time phase space path integral is utilised in the Hamiltonian formulation which maintains connection to the Hilbert space of the system, and it is found that the horizon entropy is derived from a nearly Lorentzian configuration.
일반주제명  
Physics.
일반주제명  
Thermodynamics.
일반주제명  
Theoretical physics.
키워드  
Black holes
키워드  
Cosmological horizons
키워드  
Quantum gravity
키워드  
Statistical mechanics
키워드  
Thermodynamics
기타저자  
University of Maryland, College Park Physics
기본자료저록  
Dissertations Abstracts International. 85-04B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■006m          o    d                
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■020    ▼a9798380580885
■035    ▼a(MiAaPQ)AAI30574699
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aBanihashemi,  Batoul.▼0(orcid)0000-0002-2867-9209
■24510▼aThermodynamics  of  Quantum  Gravitational  Ensembles▼h[electronic  resource]
■260    ▼a[S.l.]:▼bUniversity  of  Maryland,  College  Park.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(206  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-04,  Section:  B.
■500    ▼aAdvisor:  Jacobson,  Theodore.
■5021  ▼aThesis  (Ph.D.)--University  of  Maryland,  College  Park,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aThe  discovery  of  black  hole  thermodynamics  and  its  extension  to  cosmological  horizons  demonstrated  a  deep  connection  between  thermodynamics  and  the  nature  of  spacetime  as  a  quantum  system.  It  is  then  of  great  importance  to  properly  understand  the  statistical  mechanics  of  gravitational  systems  with  horizon  from  first  principles.  While  employing  a  partition  function  and  the  gravitational  "Euclidean  path  integral"  produces  the  expected  physical  result  for  entropy,  a  number  of  fundamental  questions  about  the  underlying  analysis  persist.  This  dissertation  sharpens  and  resolves  some  puzzles  regarding  statistical  mechanics  of  gravitational  ensembles  and  the  gravitational  path  integral,  with  a  focus  on  cosmological  horizons  and  de  Sitter  space. The  main  questions  addressed  in  this  dissertation  are:  how  is  the  entropy  of  de  Sitter  space  derived  in  absence  of  any  boundary  on  which  the  statistical  ensemble  can  be  properly  defined?  What  is  the  correct  interpretation  of  the  first  law  of  de  Sitter  horizon,  according  to  which  the  horizon  area  shrinks  upon  adding  matter  in  de  Sitter  static  patch?  And  finally,  can  entropy  of  horizon-bounded  systems  be  derived  from  a  Hamiltonian  approach  and  phase  space  path  integral,  without  the  trickery  of  the  gravitational  Euclidean  path  integral?  The  first  two  questions  are  answered  by  introducing  an  artificial  boundary  in  the  system  on  which  a  gravitational  ensemble  can  be  properly  defined.  Once  the  ensemble  is  defined,  the  semiclassical  approximation  of  the  statistical  partition  function  yields  the  entropy,  and  the  interpretation  of  the  de  Sitter  first  law  becomes  clear  by  identifying  the  system  energy  as  the  quasilocal  energy  defined  on  the  boundary.  To  tackle  the  last  question,  the  real-time  phase  space  path  integral  is  utilised  in  the  Hamiltonian  formulation  which  maintains  connection  to  the  Hilbert  space  of  the  system,  and  it  is  found  that  the  horizon  entropy  is  derived  from  a  nearly  Lorentzian  configuration.
■590    ▼aSchool  code:  0117.
■650  4▼aPhysics.
■650  4▼aThermodynamics.
■650  4▼aTheoretical  physics.
■653    ▼aBlack  holes
■653    ▼aCosmological  horizons
■653    ▼aQuantum  gravity
■653    ▼aStatistical  mechanics
■653    ▼aThermodynamics
■690    ▼a0605
■690    ▼a0753
■690    ▼a0348
■71020▼aUniversity  of  Maryland,  College  Park▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g85-04B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0117
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934307▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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