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Compact binary systems in scalar-tensor gravity

Laura Bernard

Observations of gravitational waves from inspiraling compact binary systems allow us not only to measure the astrophysical properties of these systems but also to test general relativity in its strong field regime. Both the detection and analysis of gravitational waves require a bank of very accurate template gravitational waveforms. In order to constrain deviations from general relativity, one also has to build template waveforms for alternative theories of gravity.

In this talk, I will focus on massless scalar-tensor theories and address the question of the dynamics and gravitational radiation of non-spinning compact binaries. In particular, I will present our method, based on a Fokker action adapted to the specificities of scalar-tensor theories, which allows us to derive the equations of motion at the 3PN order in harmonic coordinates. This result is primordial in order to compute the scalar and gravitational waveforms at 2PN order.

2017 November 27, 11:30

Faculdade de CiÍncias da Universidade de Lisboa (C8.2.14)
Campo Grande, 1749-016 Lisboa

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda√ß√£o para a Ci√™ncia e a Tecnologia
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