XV Black Holes Workshop
The XV Black Holes Workshop will take place at ISCTE, University Institute of Lisbon, on 19-20 December 2022. Registration opens on September 19th.
Astrophysics News & Events
NewFunFiCO network
A new staff exchange network - NewFunFiCO - was chosen for funding within the Horizon-MSCA-2021-SE-01 call. The network has nodes at Aveiro University (Portugal, coordinator), University of Valencia (Spain), Johann Wolfgang Goethe-Universitaet Frankfurt Am Main (Germany), Universidad Nacional Autonoma de Mexico (Mexico), Universidade Federal do Pará (Brazil) and the Chinese University of Hong Kong (China). The network will start on January 1st 2023 and have a lifetime of 4 years.
VIII Amazonian Workshop on Gravity and Analogue Models
Our group is co-organizing the VIII Amazonian Workshop on Gravity and Analogue Models, to be held in Belém, Brazil, from 21-25 November 2022. This meeting is also promoted by the FunFiCO network, for which U. Federal do Pará, in Belém, is one of the nodes, coordinated by Prof. Luis Carlos Crispino.
Exploring strong gravity systems with the techniques of magnetohydrodynamics
Speaker
Hector Olivares (from Radboud University to University of Aveiro)
Event date
Venue
Only on campus (Sala Sousa Pinto)
Event Website
Event type
Gravitational wave detections, images of black hole shadows, and other impressive developments in observational astronomy allow us to study strong gravity systems in a completely new way. Being immersed in the universe, these systems are surrounded by plasma, which can be described by the equations of magnetohydrodynamics (MHD).
A waveform catalogue for Proca star collisions
The detection of gravitational waves has been one of the most exciting scientific developments of the XXIst century. These detections are theory-driven, they rely on the existence of waveform libraries, which have been constructed for binary black holes and neutron stars. Gr@v members have collaborated on the construction of the first waveform catalogue for exotic compact objects, an effort led by former Gr@v member Nicolas Sanchis Gual (now at the U. Valencia).
Dynamical descalarization with a jump during black hole merger
Speaker
Daniela Doneva (University of Tübingen)
Event date
Venue
Online (only) - Please, note the unusual time
Event Website
Event type
The black hole merger in scalar-Gauss-Bonnet gravity can lead to dynamical descalarization this is a spontaneous release of the scalar
hair of the newly formed black hole. Depending on the exact form of the Gauss-Bonnet coupling function, the stable scalarized solutions
Constraints on dark matter from observations of neutron stars and their mergers
Speaker
Violetta Sagun (University of Coimbra)
Event date
Venue
Hybrid Sala Sousa Pinto (Math dpt) and Zoom
Event Website
Event type
Compact stars due to their enormous gravitational field can accumulate a sizable amount of dark matter in their interior. Depending on its nature, an accumulated dark matter may affect the properties of neutron stars in quite different ways. I will give an overview of the impact of dark matter on various observable properties of neutron stars, i.e.
Testing General Relativity with black hole X-ray data
Speaker
Cosimo Bambi (Fudan University)
Event date
Venue
Online (only)
Event Website
Event type
The theory of General Relativity has successfully passed a large number of observational tests. The theory has been extensively tested in the weak-field regime with experiments in the Solar System and observations of binary pulsars.
New FCT funded research positions and doctoral grant
In the 5th FCT individual contest for stimulous of research, Miguel Zilhão, Guilherme Raposo and Hector Olivares obtained 6 years research positions to join Gr@v.
The fate of the light-ring instability
In the paper "The fate of the light-ring instability" Gr@v members P. Cunha, C. Herdeiro and E. Radu, together with former member, currently at the U. Valencia, N. Sanchis-Gual, have unveiled the mystery of the fate of a large class of horizonless ultracompact objects, that could be potential black hole foils.
A long standing intriguing possibility is if the astrophysical black hole candidates could be some other kind of mysterious objects but without event horizons, the defining property of black holes.