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Probing the Nature of Compact Objects: Scattering, Tides, and Quasinormal Modes
Probing the Nature of Compact Objects: Scattering, Tides, and Quasinormal Modes
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103626
- ISBN
- 9798293834495
- DDC
- 530
- 서명/저자
- Probing the Nature of Compact Objects: Scattering, Tides, and Quasinormal Modes
- 발행사항
- [Sl] : University of Maryland, College Park, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 525 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Jacobson, Theodore A.;Buonanno, Alessandra.
- 학위논문주기
- Thesis (Ph.D.)--University of Maryland, College Park, 2025.
- 초록/해제
- 요약The LIGO-VIRGO-KAGRA (LVK) collaboration has detected 90 confirmed gravitational-wave (GW) events and nearly 200 confident triggers across four observational runs. Coalescing black-hole (BH) and neutron-star (NS) binaries are primary GW sources, offering the unique possibility to probe the nature of compact objects and gravitational dynamics. This dissertation investigates how the intrinsic properties of compact objects affect their dynamics and GW emission, using worldline effective field theories (WEFTs) and BH perturbation theory (BHPT), with emphasis on selected scattering processes in General Relativity (GR).Scattering of two BHs in the post-Minkowskian (PM) regime has proven valuable for extracting binary dynamics from gauge-invariant scattering observables. As a simpler analog, we study electromagnetic (EM) scattering of two charged particles in the post-Lorentzian (PL) expansion. We compute scattering observables to 3PL order and map them to their bound-orbit counterparts, deriving new boundary-to-bound (B2B) relations. We verified these mappings for gravity at first post-Newtonian (PN) order.Another key setup involves GWs scattering off compact objects i.e., gravitational Compton/Raman scattering. We compute the classical Compton amplitude at linear order in the mass of the scattering body, and to third order in spin, for generic parity-invariant compact objects, using a WEFT with spin-induced multipole couplings, finding agreement with expectations from amplitude-based methods in the Kerr BH case, while presenting new results for generic objects.We extract the low-frequency tidal response of Kerr BHs by matching the tidal contribution to the Raman amplitude computed in BHPT to its WEFT counterpart, thereby constraining key tidal coefficients such as Love numbers and dissipation numbers. We then use the dissipation numbers to compute horizon-flux-induced mass and angular-momentum loss in Kerr-BH binaries, resolving longstanding discrepancies with the test-body limit and obtaining waveform corrections up to 4PN order. Additionally, we recover the vanishing of BH Love numbers and identify a nonlinear mixing of tidal and non-tidal effects, resulting in a scale-dependent tidal response via classical renormalization group flow.We also extend this approach to NSs, and extract electric, quadrupolar, Love and dissipation numbers from the Raman amplitude as a function of the boundary conditions for the metric perturbations at the stellar surface, that are determined by numerically solving the metric- and matter-perturbation equations inside the NS. This allows us to roughly quantify the impact of tidal heating on the GW phase during the inspiral across different equations of state.Finally, we study the interplay between quasinormal modes (QNMs) and reflectivity for generic compact objects modeled in the membrane paradigm-a phenomenological framework that encodes interior structure via a fictitious surface fluid. We extend the phenomenological framework to linear order in spin, we analyze how membrane parameters influence the QNM spectrum and reflectivity.
- 일반주제명
- Physics
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 키워드
- Horizon fluxes
- 키워드
- Tidal effects
- 기타저자
- University of Maryland, College Park Physics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103626
■006m o d
■007cr#unu||||||||
■020 ▼a9798293834495
■035 ▼a(MiAaPQ)AAI32046378
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aMuddu, Venkata Sai Saketh.▼0(orcid)0000-0003-2777-7891
■24510▼aProbing the Nature of Compact Objects: Scattering, Tides, and Quasinormal Modes
■260 ▼a[Sl]▼bUniversity of Maryland, College Park▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a525 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Jacobson, Theodore A.;Buonanno, Alessandra.
■5021 ▼aThesis (Ph.D.)--University of Maryland, College Park, 2025.
■520 ▼aThe LIGO-VIRGO-KAGRA (LVK) collaboration has detected 90 confirmed gravitational-wave (GW) events and nearly 200 confident triggers across four observational runs. Coalescing black-hole (BH) and neutron-star (NS) binaries are primary GW sources, offering the unique possibility to probe the nature of compact objects and gravitational dynamics. This dissertation investigates how the intrinsic properties of compact objects affect their dynamics and GW emission, using worldline effective field theories (WEFTs) and BH perturbation theory (BHPT), with emphasis on selected scattering processes in General Relativity (GR).Scattering of two BHs in the post-Minkowskian (PM) regime has proven valuable for extracting binary dynamics from gauge-invariant scattering observables. As a simpler analog, we study electromagnetic (EM) scattering of two charged particles in the post-Lorentzian (PL) expansion. We compute scattering observables to 3PL order and map them to their bound-orbit counterparts, deriving new boundary-to-bound (B2B) relations. We verified these mappings for gravity at first post-Newtonian (PN) order.Another key setup involves GWs scattering off compact objects i.e., gravitational Compton/Raman scattering. We compute the classical Compton amplitude at linear order in the mass of the scattering body, and to third order in spin, for generic parity-invariant compact objects, using a WEFT with spin-induced multipole couplings, finding agreement with expectations from amplitude-based methods in the Kerr BH case, while presenting new results for generic objects.We extract the low-frequency tidal response of Kerr BHs by matching the tidal contribution to the Raman amplitude computed in BHPT to its WEFT counterpart, thereby constraining key tidal coefficients such as Love numbers and dissipation numbers. We then use the dissipation numbers to compute horizon-flux-induced mass and angular-momentum loss in Kerr-BH binaries, resolving longstanding discrepancies with the test-body limit and obtaining waveform corrections up to 4PN order. Additionally, we recover the vanishing of BH Love numbers and identify a nonlinear mixing of tidal and non-tidal effects, resulting in a scale-dependent tidal response via classical renormalization group flow.We also extend this approach to NSs, and extract electric, quadrupolar, Love and dissipation numbers from the Raman amplitude as a function of the boundary conditions for the metric perturbations at the stellar surface, that are determined by numerically solving the metric- and matter-perturbation equations inside the NS. This allows us to roughly quantify the impact of tidal heating on the GW phase during the inspiral across different equations of state.Finally, we study the interplay between quasinormal modes (QNMs) and reflectivity for generic compact objects modeled in the membrane paradigm-a phenomenological framework that encodes interior structure via a fictitious surface fluid. We extend the phenomenological framework to linear order in spin, we analyze how membrane parameters influence the QNM spectrum and reflectivity.
■590 ▼aSchool code: 0117.
■650 4▼aPhysics
■650 4▼aAstrophysics
■650 4▼aAstronomy
■653 ▼aBlack hole perturbation theory
■653 ▼aEffective field theory
■653 ▼aGravitational waves
■653 ▼aHorizon fluxes
■653 ▼aTidal effects
■653 ▼aWorldline effective field theories
■690 ▼a0605
■690 ▼a0596
■690 ▼a0606
■71020▼aUniversity of Maryland, College Park▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0117
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357977▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
