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Cosmic Veiling and Pre-Inflationary Initial Conditions in R+R2Gravity
Cosmic Veiling and Pre-Inflationary Initial Conditions in R+R2Gravity
Cosmic Veiling and Pre-Inflationary Initial Conditions in R+R2Gravity

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152110
ISBN  
9798384211174
DDC  
600
저자명  
Flores, Miguel Alberto Fernandez.
서명/저자  
Cosmic Veiling and Pre-Inflationary Initial Conditions in R+R2Gravity
발행사항  
[Sl] : The Pennsylvania State University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
116 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Bianchi, Eugenio.
학위논문주기  
Thesis (Ph.D.)--The Pennsylvania State University, 2024.
초록/해제  
요약In this thesis, we propose and explore the consequences of the principle of cosmic veiling for the pre-inflationary epoch of the universe. The principle is based on the requirement that there exists a consistent post-Planckian, but pre-inflationary epoch of the universe in which the framework of perturbative quantum field theory remains valid, and that the transition is smooth. Inflation then functions as a censor of the initial singularity by pushing back the Planck scale further into the past, serving a role similar to horizons of black holes that censor their singularities. The principle of cosmic veiling allows then a maximumamount of inflationary e-foldings to just barely censor the initial singularity. The initial quantum state is prepared at the transition between the quantum gravity and quantum field theory regimes, and is chosen to be compatible with cosmic veiling, that is, the initial state should not spoil the veiling by containing additional information from the Planck epoch, defined as the epoch when the curvature length scale is of the order of the Planck length.An immediate consequence of this principle is, by allowing ourselves to push the domain of validity of quantum field theory to its maximal limit, we can set initial conditions at an earlier time. Classically, singularities are censored to prevent pathologies in the causual structure of the manifold. In conjunction with quantum mechanics, Hawking provided a mechanism through which one could peer at the singularity- only very barely- at the end of the black hole's life, through Hawking evaporation of black holes. Cosmic veiling is a similar, mild violation of the censorship of the initial singularity- we elevate the role of inflation as a censor that pushes back in time the Planck scale and require that the amount of inflation is bounded from above such that we can peer back far enough to observe some features from the primordial epoch. In this manner, the amount of inflation, which is already bounded from below by requiring sufficient e-foldings to be compatible with observation, we can postulate a very narrow "Goldilocks" band in which inflation lasts long enough to make our universe interesting, but not observationally excluded. We determine the effect on the cosmic microwave background and discuss the possibility of future observations.
일반주제명  
Friction
일반주제명  
Spacetime
일반주제명  
Equality
일반주제명  
Quantum field theory
일반주제명  
Gravity
일반주제명  
Black holes
일반주제명  
Probability distribution
일반주제명  
Geometry
일반주제명  
Radiation
일반주제명  
Censorship
일반주제명  
Universe
일반주제명  
Astronomy
일반주제명  
Astrophysics
일반주제명  
Quantum physics
일반주제명  
Statistics
일반주제명  
Theoretical physics
기타저자  
The Pennsylvania State University.
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aFlores,  Miguel  Alberto  Fernandez.
■24510▼aCosmic  Veiling  and  Pre-Inflationary  Initial  Conditions  in  R+R2Gravity
■260    ▼a[Sl]▼bThe  Pennsylvania  State  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a116  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Bianchi,  Eugenio.
■5021  ▼aThesis  (Ph.D.)--The  Pennsylvania  State  University,  2024.
■520    ▼aIn  this  thesis,  we  propose  and  explore  the  consequences  of  the  principle  of  cosmic  veiling  for  the  pre-inflationary  epoch  of  the  universe.  The  principle  is  based  on  the  requirement  that  there  exists  a  consistent  post-Planckian,  but  pre-inflationary  epoch  of  the  universe  in  which  the  framework  of  perturbative  quantum  field  theory  remains  valid,  and  that  the  transition  is  smooth.  Inflation  then  functions  as  a  censor  of  the  initial  singularity  by  pushing  back  the  Planck  scale  further  into  the  past,  serving  a  role  similar  to  horizons  of  black  holes  that  censor  their  singularities.  The  principle  of  cosmic  veiling  allows  then  a  maximumamount  of  inflationary  e-foldings  to  just  barely  censor  the  initial  singularity.  The  initial  quantum  state  is  prepared  at  the  transition  between  the  quantum  gravity  and  quantum  field  theory  regimes,  and  is  chosen  to  be  compatible  with  cosmic  veiling,  that  is,  the  initial  state  should  not  spoil  the  veiling  by  containing  additional  information  from  the  Planck  epoch,  defined  as  the  epoch  when  the  curvature  length  scale  is  of  the  order  of  the  Planck  length.An  immediate  consequence  of  this  principle  is,  by  allowing  ourselves  to  push  the  domain  of  validity  of  quantum  field  theory  to  its  maximal  limit,  we  can  set  initial  conditions  at  an  earlier  time.  Classically,  singularities  are  censored  to  prevent  pathologies  in  the  causual  structure  of  the  manifold.  In  conjunction  with  quantum  mechanics,  Hawking  provided  a  mechanism  through  which  one  could  peer  at  the  singularity-  only  very  barely-  at  the  end  of  the  black  hole's  life,  through  Hawking  evaporation  of  black  holes.  Cosmic  veiling  is  a  similar,  mild  violation  of  the  censorship  of  the  initial  singularity-  we  elevate  the  role  of  inflation  as  a  censor  that  pushes  back  in  time  the  Planck  scale  and  require  that  the  amount  of  inflation  is  bounded  from  above  such  that  we  can  peer  back  far  enough  to  observe  some  features  from  the  primordial  epoch.  In  this  manner,  the  amount  of  inflation,  which  is  already  bounded  from  below  by  requiring  sufficient  e-foldings  to  be  compatible  with  observation,  we  can  postulate  a  very  narrow  "Goldilocks"  band  in  which  inflation  lasts  long  enough  to  make  our  universe  interesting,  but  not  observationally  excluded.  We  determine  the  effect  on  the  cosmic  microwave  background  and  discuss  the  possibility  of  future  observations.
■590    ▼aSchool  code:  0176.
■650  4▼aFriction
■650  4▼aSpacetime
■650  4▼aEquality
■650  4▼aQuantum  field  theory
■650  4▼aGravity
■650  4▼aBlack  holes
■650  4▼aProbability  distribution
■650  4▼aGeometry
■650  4▼aRadiation
■650  4▼aCensorship
■650  4▼aUniverse
■650  4▼aAstronomy
■650  4▼aAstrophysics
■650  4▼aQuantum  physics
■650  4▼aStatistics
■650  4▼aTheoretical  physics
■690    ▼a0606
■690    ▼a0596
■690    ▼a0599
■690    ▼a0463
■690    ▼a0753
■71020▼aThe  Pennsylvania  State  University.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0176
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162903▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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