American Physical Society invited the authors of the paper "Exotic Compact Objects and the fate of the light ring instability" to participate in the APS Journal Club (JC), dedicated to selected papers published in Physical Review Letters. It was the first time this JC was dedicated to a gravity paper. The video recording of the session will be found in the JC webpage.
The discussion will focus on the following papers:
"Nonlinear effects in black hole ringdown", by Mark Ho-Yeuk Cheung, et al [arXiv:2208.07374 ];
Our group organized the "State of the art techniques in Strong Gravity" Meeting, in São Pedro do Sul 26-28 April 2023 as a retreat type meeting to exchange ideas. The inspiring discussions will certainly foster new research!
Gr@v Ph.D. student E. Costa presented a seminar on the "Proca-Higgs model" in the Mini-Workshop "New Horizons for Horizonless Physics" at the Galileo Galilei Institute in Florence, Italy.
C. Herdeiro presented an invited colloquium at the U. Tubingen. Thank you to D. Doneva and the whole group for the warm and scientifically stimulating hospitality!
On April 12th, Gr@v member Pedro Cunha gave an invited seminar to the Physics Department of the University of Coimbra, within the ongoing series "coffee with physics". The seminar, entitled "The fate of the light-ring instability", focused on a recent publication.
Carlos and Eugen visited the birthplace of Einstein: "Here stood the house where Albert Einstein came to the world on March 14 1879." The building was destroyed in a WWII bombing in December 1944.
Prof. Maurício Richartz, from ABC Federal University, State of São Paulo, Brazil, visited Gr@v in March-April 2023, to discuss analogue models of gravity and other topics. Thank you for your visit Maurício and see you soon!
Astrophysical black holes are consistent with the Kerr metric, but current observations do not rule out small deviations from it. In this work we use the continued fraction method to determine the eigenfrequencies associated with a Kerr-like black hole.
The next decade will see an overwhelming number of cosmological surveys coming online. The Square Kilometre Array Observatory (SKAO) will, among several other science cases, map the distribution of cold neutral Hydrogen in the Universe using its spin-flip transition emission line at rest of 21cm or 1.4GHz and a novel technique called Intensity Mapping (IM).