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Author ORCID Identifier
https://orcid.org/0000-0003-3869-2850
AccessType
Open Access Dissertation
Document Type
dissertation
Degree Name
Doctor of Philosophy (PhD)
Degree Program
Physics
Year Degree Awarded
2022
Month Degree Awarded
September
First Advisor
Jennie Traschen
Second Advisor
Lorenzo Sorbo
Subject Categories
Elementary Particles and Fields and String Theory
Abstract
Production of particles from nontrivial backgrounds is an important phenomenon in quantum field theory. In this thesis, we review some useful formulae of Bogoliubov formalism and explain how to derive the spectra of particle production. We then apply the formalism to study several scenarios. We first study the Schwinger effect in compact $(1+1)$ dimensions spacetime. Using the in-in formalism, we compute the correction to the electric field from the creation of charged particles both when the spatial dimension is compact and when it is non-compact. Secondly, we investigate the thermodynamic properties of the Schwarzschild-de Sitter (SdS) system. We explore particle production in Schwarzschild-de Sitter spacetime and obtain the spectrum of created particles. We find that for the small black hole limit, our calculation matches the standard Schwarzschild black hole case computed by Hawking, and the production rate goes to zero in the maximal mass limit. A related project investigating the Schottky anomaly in Schwarzschild-de Sitter system, that is, ways in which SdS thermodynamics resembles that of a 2-state statistical system. We show that the Schottky anomaly persists in the presence of particle production. Lastly, we compute the power spectrum of tensor fluctuations accounting for gravitational waves generated by the thermal bath. We find that in some parameter regimes the sourced component exceeds the standard vacuum contribution.
DOI
https://doi.org/10.7275/30801288
Recommended Citation
Qiu, Yue, "QUANTUM FIELD THEORY IN NONTRIVIAL BACKGROUNDS AND PARTICLE PRODUCTION" (2022). Doctoral Dissertations. 2715.
https://doi.org/10.7275/30801288
https://scholarworks.umass.edu/dissertations_2/2715
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.