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 #  AuthorTitleAccn#YearItem Type Claims
1 Soni, Kanchan Efficient searches for compact binary coalescences and science in the LIGO - India era D00125 2024 Book  
2 Shreejit Jadhav Algorithms for Gravitational Wave, Data Analysis and Detector Controls based on Modern Techniques D00123 2023 Book  
3 Sayak Datta Distinguishing black holes, neutron stars and exotic compact objects in inspiraling binaries D00109 2021 Book  
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TitleEfficient searches for compact binary coalescences and science in the LIGO - India era
Author(s)Soni, Kanchan;Mitra, Sanjiv
PublicationPUne, IUCAA Thesis, 2024.
Description212;HB
NotesIUCAA
ISBN,PriceRs 0.00
ClassificationIUCAA Thesis
Keyword(s)1. GRAVITATIONAL WAVES 2. IUCAA Thesis 3. Laser iterferometers 4. LIGO India
Item TypeBook

Circulation Data
Accession#  Call#StatusIssued ToReturn Due On Physical Location
D00125   IUCAA Thesis/KAN/  On Shelf    

2.     
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TitleAlgorithms for Gravitational Wave, Data Analysis and Detector Controls based on Modern Techniques
Author(s)Shreejit Jadhav;Sanjit Mitra, Guide
PublicationPune, Research Thesis, 2023.
Description157pp : HB
ClassificationTHESIS SECTION
Keyword(s)1. DATA ANALYSIS 2. Detector Controls 3. GRAVITATIONAL WAVE 4. IUCAA Thesis 5. THESIS
Item TypeBook

Circulation Data
Accession#  Call#StatusIssued ToReturn Due On Physical Location
D00123     On Shelf    

3.    
No image available
TitleDistinguishing black holes, neutron stars and exotic compact objects in inspiraling binaries : A thesis submitted for the degree of Doctor of Philosophy (in Physics) submitted to the Jawaharlal Nehru University, Delhi, India
Author(s)Sayak Datta
PublicationPune, IUCAA, 2021.
Description184 p.
Abstract NoteThe primary defining feature of a classical black hole is being a perfect absorber. Any evidence showing otherwise would imply a departure from the standard blackhole picture. Energy and angular momentum absorption by the horizon of a black hole is responsible for tidal heating in a binary. This effect is important in the late stages of an extreme mass ratio inspiral around a spinning supermassive object, which is one of the main targets of the upcoming LISA mission. We study the potential of this effect to be used as a probe of the nature of supermassive objects. We compute the orbital dephasing and the gravitational-wave signal emitted by a point particle in circular, equatorial motion around a spinning supermassive object to the leading order in the mass ratio. Absence of absorption by the central object can affect the gravitational-wave signal dramatically, especially at high spin. This effect will make it possible to put an unparalleled upper bound on the reflectivity of exotic compact objects, at the level of O(0.01)%. This stringent bound would exclude the possibility of observing echoes in the ringdown of a supermassive binary merger. We also do Fisher analysis to estimate the errors that will be present for EMRIs. We study how tidal heating of an ECO gets modified due to the presence of a reflective surface and what implication it brings for the gravitational wave observations. We argue that the position of the reflective surface, ε ≳ 10−5, can have an observational impact in extreme mass ratio inspirals. We also discuss a possible degeneracy between ε and reflectivity, |R|2, in the context of parameter estimation. In the context of comaparable mass binaries, we show how by careful monitoring of the presence or absence of tidal deformability (TD) and tidal-heating (TH) in the inspiral signal of compact object binaries in ground-based gravitational wave (GW) detectors one can test if its components are black holes or not. The former property (TD) is finite for neutron stars but vanishes for black holes (in General Relativity), whereas the latter is finite for black holes and negligible for neutron stars, and affects the GW phase evolution of binaries in a distinctly different way. We introduce waveform parameters that characterize the strength of tidal-heating, and are zero when there is no horizon. We demonstrate how by using those parameters Bayesian methods can distinguish the presence or absence of horizons in a binary. This is a particularly exciting prospect owing to several claims that these stellar-mass objects, especially, with masses heavier than those of neutron stars, may not have a horizon but may be black hole mimickers or exotic compact objects (ECOs). Perhaps more significant is the possibility that our method can be used to test the presence or absence of horizons in mass-gap binaries and, thereby, help detect the heaviest neutron star or the lightest black hole. A proper accounting of tidal-heating in binary waveform models will also be critical for an unbiased measurement of characteristics of the equation of state of neutron stars in GW observations of binaries containing them – or even to probe the existence of ECOs.
NotesJawaharlal Nehru University
ISBN,PriceRs 0.00
ClassificationTHESIS SECTION
Keyword(s)1. Black Hole - Thesis 2. GRAVITATIONAL WAVES - THESIS 3. IUCAA Thesis 4. Neutron star - Thesis 5. THESIS - IUCAA 6. THESIS - SAYAK DATTA
Item TypeBook

Circulation Data
Accession#  Call#StatusIssued ToReturn Due On Physical Location
D00109     On Shelf    

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