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Visit of João Dinis Álvares

On Oct. 22nd 2025 we had the visit of João Dinis Álvares, who completed his M.Sc. at IST-Lisbon. João gave an interesting talk on the evolution of scalar fields around black holes and also shared with us that he decided to study physics after an outreach talk by Gr@v members, in Braga, back in 2017. Thank you João, for the kind words and all the best for your Ph.D. abroad!

How much can gravitons be squeezed?

GGD - Gr@V Seminar
Speaker
Panagiotis Dorlis (National Technical University of Athens (NTUA))
Event date
Venue
Hybrid: Sala Sousa Pinto and Teams
Event Website
Event type

Dyson, just before the first detection of Gravitational Waves (GWs) by LIGO, raised the question of whether the detection of a single graviton can be achieved with GW strain detectors. If this is possible, then it would be a direct evidence for the quantization of the gravitational field.

Electrically Charged Hyperboloidal Evolution

GGD - Gr@V Seminar
Speaker
João Dinis Álvares (Instituto de Telecomunicações)
Event date
Venue
Hybrid: Sala Sousa Pinto and Teams
Event Website
Event type

We present the Einstein-Maxwell-Klein-Gordon system in hyperboloidal slices, a recent formulation for extracting signals at future null infinity. As far as we know, this is the first time this setup is evolved with a common formulation like BSSN/Z4. Using hyperboloidal slices, contrary to other recent methods like Cauchy-Characteristic Matching, we can continuously reach future null infinity.