Off-campus UMass Amherst users: To download campus access dissertations, please use the following link to log into our proxy server with your UMass Amherst user name and password.
Non-UMass Amherst users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
Dissertations that have an embargo placed on them will not be available to anyone until the embargo expires.
Date of Award
9-2012
Access Type
Campus Access
Document type
dissertation
Degree Name
Doctor of Philosophy (PhD)
Degree Program
Physics
First Advisor
John F. Donoghue
Second Advisor
David Kastor
Third Advisor
Lorenzo Sorbo
Subject Categories
Other Physics
Abstract
In this dissertation, four different topics are investigated in high energy physics beyond the standard model. In the first chapter, diffeomorphism invariance breaking in gravity is studied in the concept of emergent symmetry, which has not been studied before in this concept. In the second chapter, this investigation is extended by studying the cosmological evolution of the scale factor in our diffeomorphism violating model. In the third chapter, a higher derivative model of four-form fields is considered. The model presents a counter-example for several accepted no-goes in the literature. Finally, in the last chapter, another commonly accepted conjecture is questioned, which assumes that the tree unitarity violation in an effective field theory determines the domain of validity of the theory and predicts the onset of new physics. It is argued that this is parametrically incorrect in the case of chiral perturbation theory and is probably theoretically incorrect in general.
DOI
https://doi.org/10.7275/5691978
Recommended Citation
Aydemir, Ufuk, "Topics in High Energy Physics Beyond the Standard Model" (2012). Doctoral Dissertations 1896 - February 2014. 382.
https://doi.org/10.7275/5691978
https://scholarworks.umass.edu/dissertations_1/382