자료유형  

 학위논문

Control Number  

0016934249

International Standard Book Number  

9798380384933

Dewey Decimal Classification Number  

530.1

Main Entry-Personal Name  

Liang, Qiuyue.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of Pennsylvania., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(222 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

General Note  

Advisor: Trodden, Mark.

Dissertation Note  

Thesis (Ph.D.)--University of Pennsylvania, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약In this thesis, I present the research conducted during my Ph.D. program on new gravitational interactions in cosmology, integrating theoretical advancements with observational evidence. I begin by examining a tension between measurements of Hubble constant made using data from radically different cosmic epochs, and proposing a theoretical model that suggests an interaction between neutrinos and gravity could help alleviate this tension. I then turn to more formal considerations of Effective Field Theories (EFTs) in cosmology. In particular, I show how to generalize the EFT of the binary black hole system to extended objects, constructing the EFT for a binary cosmic string system. I further study the EFT for symmetry-breaking Conformal Field Theories (CFTs), which can be applied to the early universe. Beyond EFTs, the study of gravity becomes increasingly complex, particularly as nonlinearities become important. Dualities may provide a useful tool to make progress in this regime, and with this in mind I have also explored the massive double copy; a relation between the non-linear sigma model and the special galileon theory when there are mass scales. Finally, I describe work on the observational opportunities presented by the new era of multi-messenger cosmology. I focus on Pulsar Timing Array (PTA) systems, discussing their roles in gravitational wave detection and their potentials for testing modified gravity theories. Through these studies, this thesis aims to contribute to the ongoing dialogue between gravitational physics and cosmology.

Subject Added Entry-Topical Term  

Theoretical physics.

Subject Added Entry-Topical Term  

Particle physics.

Subject Added Entry-Topical Term  

Astrophysics.

Index Term-Uncontrolled  

Conformal field theory

Index Term-Uncontrolled  

Cosmological tension

Index Term-Uncontrolled  

Effective field theory

Index Term-Uncontrolled  

Gravitational wave

Index Term-Uncontrolled  

Modified gravity

Index Term-Uncontrolled  

Pulsar Timing Array

Added Entry-Corporate Name  

University of Pennsylvania Physics and Astronomy

Host Item Entry  

Dissertations Abstracts International. 85-03B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:643092