ETD

Digital archive of theses discussed at the University of Pisa

 

Thesis etd-11212020-194853


Thesis type
Tesi di laurea magistrale
Author
NICOLINI, GIORGIO
URN
etd-11212020-194853
Thesis title
"TIMeR": a time-domain waveform model for testing General Relativity with gravitational waves
Department
FISICA
Course of study
FISICA
Supervisors
relatore Dott. Ghosh, Abhirup
relatore Prof. Del Pozzo, Walter
Keywords
  • test
  • modified gravity
  • gravitational waves
  • General Relativity
  • black holes
Graduation session start date
07/12/2020
Availability
Withheld
Release date
07/12/2060
Summary
Since the first detection of gravitational waves General Relativity can be tested in its highly-dynamical and non-linear regime via several methods which are sensitive to specific kinds of deviations. For instance, the IMR consistency test probes the energy and angular-momentum loss equations by analysing the intrinsic parameters underlying individually the first and second part of gravitational-wave events produced by the inspiral, merger and ringdown of coalescing compact binaries and detected by the LIGO/Virgo interferometers. The current thesis project devises a new version of such a test in order to solve some of its open issues. In particular, it provides modified time-domain waveform models which are composed of pieces of General-Relativity waveforms which are smoothly connected to each other in such a way as to minimise spectral leakage effects and uses such models as templates to catch possible departures from General Relativity in gravitational-wave events. In this new formulation, the method also ensures a greater compactness since it uses one single global waveform model instead of two for testing deviations in the intrinsic parameters of the source binary, i.e. its component masses and spins, and lends itself to more general scenarios where the transition time separating the two parts of the waveform is parameter-dependent or even a free parameter of the model. The method has been validated for simulations of non-spinning equal-mass General-Relativity waveforms by estimating its intrinsic parameters via Bayesian-inference techniques in the zero-noise realisation.
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