Grad Seminar: Dynamical Tidal Deformation of a Body in General Relativity, Without Modes

Date and Time


MacN 222


Join us for a seminar from masters student ​Tristan Pitre on how he applies general relativity to the study of deformation in binary neutron stars! 
Everyone is welcome to join! We would love to see more undergrad students come out to learn about the exciting research being carried out in the department.


Tristan Pitre


In the context of a neutron star in a binary system, the emitted gravitational waves are influenced by the tidal deformation caused by its companion. Initially, during the early inspiral, the interaction is described by static tides. However, as the process progresses, the growing effect of dynamical tides becomes evident. The existing literature employs a spectral approach linked to the star's normal modes, grounded in Newtonian physics, which poses challenges when extending to general relativity. This study introduces a mode-less description applicable to both Newtonian and relativistic mechanics. Assuming a slowly evolving tidal field and utilizing a time-derivative expansion, the characterization of tidal deformation involves both static and dynamic Love numbers. Computational results for polytropic models in both Newtonian gravity and general relativity are provided. To overcome the initial limitations of this new approach, where the slow-evolving tidal field approximation prevents the capturing of resonance in dynamical tides, this study introduces an extension of the time-derivative expansion with the goal of achieving accuracy comparable to the f-mode truncation in the mode representation.


There will be snacks available throughout the talk, as well as refreshments available beforehand in the lunchroom on the 2nd floor of MacN. 

For those unable to attend in person, the talk will also be streamed live over teams.


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