Strong Gravity News & Events

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Zeus Sales thesis defense

Zeus Sales Moreira successfully defended his Ph.D. thesis on March 31st 2025, which was advised by C. Herdeiro. The committee was composed by Profs. Darío Nunez, Eugen Radu, Alberto Saa and Gonzalmo Olmo and unanimously praised the excellent work of the candidate. Congratulations Zeus and all the best for the future!

Nonlinearities in black hole ringdown

GGD - Gr@V Seminar
Speaker
Adrien Kuntz (CENTRA, IST)
Event date
Venue
Hybrid: room 11.2.21 and Zoom
Event type

Nonlinear effects in black hole perturbation theory may be important for describing a black hole ringdown, as suggested by recent works. I will describe a new class of "quadratic" quasi-normal modes at second order in perturbation theory. Remarkably, not only their frequency but also their amplitude is completely determined by the linear modes themselves.

Gravitational Lensing in the Kerr Spacetime: An Analytic Approach for Light and High-Frequency Gravitational Waves

GGD - Gr@V Seminar
Speaker
Torben Frost (Kavli Institute for Astronomy and Astrophysics, Peking University)
Event date
Venue
Online (Zoom)
Event type

Black holes are the most massive objects in the Universe and provide an ideal testing ground for gravity in the strong field regime.

Curvature dependence of gravitational-wave tests: from theory to observation

GGD - Gr@V Seminar
Speaker
Laura Bernard (Laboratoire d’étude de l’Univers et des phénomènes eXtrêmes)
Event date
Venue
Hybrid: room 11.2.21 and Zoom
Event type

Next generation of gravitational wave detectors will have the sensibility to detect potential deviations in gravitational waveforms with respect to general relativity. However, current agnostic tests are plagued by a lack of realistic deviations, making it difficult to interpret such detections with respect to specific theories.

An Overview of the magnetized advective flows around black holes

GGD - Gr@V seminar
Speaker
Samik Mitra (Indian Institute of Technology Guwahati)
Event date
Venue
Online only
Event type

One of the most efficient energy sources in the universe is the matter accretion onto compact objects, such as black holes (BHs) and neutron stars (NSs). Since magnetic fields are ubiquitous everywhere, the accretion flow is expected to be magnetized in nature, where the large-scale magnetic fields inside the disks are commonly rooted either from the companion star or the interstellar medium.