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:20260701T003111Z UID:a897ad98-cdb2-452f-b547-c857c616302d SEQUENCE:2 CREATED:20251104T105217Z DESCRIPTION:Gravitational wave astronomy revolutionized physics. My PhD fo cuses on the study of systems of radiation sources around massive black ho les. In the first project of my PhD\, we investigated the motion of a radi ating charged particle around a spinning black hole in the presence of a m agnetic field. These systems are important from the point of view of energ y extraction mechanisms from black holes\, a proposed source of high-energ y cosmic rays. Our work corrected misconceptions in the literature about t he dynamics of such systems and showed that one can use superradiance to e xtract energy from the black hole\, outspiralling and drifting away from t he black hole.The second\, and current\, project is focused on the underst anding of the gravitational-wave signal produced when a stellar-mass binar y orbits a spinning massive black hole. We use Dixon’s formalism to desc ribe the stellar binary as a pointlike particle with a time-varying quadru pole moment. Using the Teukolsky formalism\, we calculate the resulting gr avitational radiation\, produced by both the internal motion of the stella r binary components around the center of mass\, and by the motion of the l atter around the massive black hole. The waveform obtained\, from first pr inciples\, shows rich physics\, namely signatures of Doppler modulation\, relativistic beaming\, strong lensing\, quasi-normal mode excitation\, and helicity-dependent scattering. The science potential of these systems can ’t be overstated\, and it might be unlocked with future\, more sensitive 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. LAST-MODIFIED:20251104T105227Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/radiation-sources-beyond-t he-vacuum-2-body-problem/ X-ALT-DESC;FMTTYPE=text/html:

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

Our wo rk corrected misconceptions in the literature about the dynamics of such s ystems and showed that one can use superradiance to extract energy from th e black hole\, outspiralling and drifting away from the black hole.
Th e second\, and current\, project is focused on the understanding of the gr avitational-wave signal produced when a stellar-mass binary orbits a spinn ing massive black hole.

We use Dixon’s formalism to describe t he stellar binary as a pointlike particle with a time-varying quadrupole m oment. Using the Teukolsky formalism\, we calculate the resulting gravitat ional radiation\, produced by both the internal motion of the stellar bina ry components around the center of mass\, and by the motion of the latter around the massive black hole.

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

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