BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Radiation sources beyond the vacuum 2-body problem DTSTART:20251107T100000Z DTEND:20251107T120000Z DTSTAMP:20260724T051342Z UID:a897ad98-cdb2-452f-b547-c857c616302d SEQUENCE:1 CREATED:20251104T105204Z DESCRIPTION: Gravitational wave astronomy revolutionized physics. My PhD f ocuses on the study of systems of radiation sources around massive black h oles. In the first project of my PhD\, we investigated the motion of a rad iating charged particle around a spinning black hole in the presence of a magnetic field. These systems are important from the point of view of ener gy extraction mechanisms from black holes\, a proposed source of high-ener gy cosmic rays. Our work corrected misconceptions in the literature about the dynamics of such systems and showed that one can use superradiance to extract energy from the black hole\, outspiralling and drifting away from the black hole.The second\, and current\, project is focused on the unders tanding of the gravitational-wave signal produced when a stellar-mass bina ry orbits a spinning massive black hole. We use Dixon’s formalism to des cribe the stellar binary as a pointlike particle with a time-varying quadr upole moment. Using the Teukolsky formalism\, we calculate the resulting g ravitational radiation\, produced by both the internal motion of the stell ar binary components around the center of mass\, and by the motion of the latter around the massive black hole. The waveform obtained\, from first p rinciples\, shows rich physics\, namely signatures of Doppler modulation\, relativistic beaming\, strong lensing\, quasi-normal mode excitation\, an d helicity-dependent scattering. The science potential of these systems ca n’t be overstated\, and it might be unlocked with future\, more sensitiv e detectors like LISA. However\, this requires challenging work to be done on the waveform modeling side\; my PhD aims to be a stepping stone in thi s direction. LAST-MODIFIED:20251104T105204Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/radiation-sources-beyond-th e-vacuum-2-body-problem/ X-ALT-DESC;FMTTYPE=text/html:

Gravitational wave astronomy revolutionized physics. My PhD focuses on the study of systems of radiation sources around massive black holes. In the first project of m y PhD\, we investigated the motion of a radiating charged particle around a spinning black hole in the presence of a magnetic field. These systems a re important from the point of view of energy extraction mechanisms from b lack holes\, a proposed source of high-energy cosmic rays.

Our w ork corrected misconceptions in the literature about the dynamics of such systems and showed that one can use superradiance to extract energy from t he black hole\, outspiralling and drifting away from the black hole.
T he second\, and current\, project is focused on the understanding of the g ravitational-wave signal produced when a stellar-mass binary orbits a spin ning massive black hole.

We use Dixon’s formalism to describe the stellar binary as a pointlike particle with a time-varying quadrupole moment. Using the Teukolsky formalism\, we calculate the resulting gravita tional radiation\, produced by both the internal motion of the stellar bin ary components around the center of mass\, and by the motion of the latter around the massive black hole.

The waveform obtained\, from fir st principles\, shows rich physics\, namely signatures of Doppler modulati on\, relativistic beaming\, strong lensing\, quasi-normal mode excitation\ , and helicity-dependent scattering. The science potential of these system s can’t be overstated\, and it might be unlocked with future\, more sens itive detectors like LISA. However\, this requires challenging work to be done on the waveform modeling side\; my PhD aims to be a stepping stone in this direction.

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