Material Type  

 학위논문

 

0017162903

Date and Time of Latest Transaction  

20250211152110

ISBN  

9798384211174

DDC  

600

Author  

Flores, Miguel Alberto Fernandez.

Title/Author  

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

Publish Info  

[S.l.] : The Pennsylvania State University., 2024

Publish Info  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Material Info  

116 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: Bianchi, Eugenio.

학위논문주기  

Thesis (Ph.D.)--The Pennsylvania State University, 2024.

Abstracts/Etc  

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.

Subject Added Entry-Topical Term  

Friction.

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Spacetime.

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Equality.

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Quantum field theory.

Subject Added Entry-Topical Term  

Gravity.

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Black holes.

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Probability distribution.

Subject Added Entry-Topical Term  

Geometry.

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Radiation.

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Censorship.

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Universe.

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Astronomy.

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Astrophysics.

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Quantum physics.

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Statistics.

Subject Added Entry-Topical Term  

Theoretical physics.

Added Entry-Corporate Name  

The Pennsylvania State University.

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:655585