Strong Gravity News & Events

The 11th School on Astrophysics and Gravitation will take place at Instituto Superior Técnico in Lisbon, from 1-6 September 2023. C. Herdeiro and M. Zilhão are two of the lecturers. More info here.

At the end of June 2023 we have enjoyed the visits of Juan Carlos Degollado (UNAM - Mexico), Nico Sanchis Gual (Valencia - Spain) and Mikaela Carrasco (USFQ - Ecuador). Nine nationalities in this group photo taken on June 28 - science brings people together!

Our group organised the European Einstein Toolkit Meeting 2023, at the University of Aveiro, 19-23 June 2023. We had excellent speakers throughout the week, and everybody had a great time. Next year's meeting should be held in Amsterdam; hope to see everyone there!

Universal Interferometric Signatures of a Black Hole's Photon Ring

Michael D. Johnson, et al.

ArXiv:1907.04329

The NANOGrav 15-year Data Set: Search for Signals from New Physics
Adeela Afzal, et al;
arXiv: 2306.16219 [gr-qc]

In this talk I will review some properties of solutions to the static, spherically symmetric Einstein-Klein-Gordon system for a collection of an arbitrary odd number N of complex scalar fields with an internal U(N) symmetry and no self-interactions known as l-boson stars.

A call for a 10 month researcher position within the project Testing the Kerr hypothesis with gravitational waves and lensing, PTDC/FIS-AST/3041/2020, is open until July 3rd 2023. The call in Portuguese and English is attached. The Euraxess link is here.

In this talk, I aim to challenge persistent misconceptions surrounding Brans-Dicke and (Buchdahl's) pure Ricci-squared theories. Through concrete counterexamples in the form of new exact solutions, I will shed light on theoretical aspects related to the violation of the Weak Energy Condition, the construction of wormholes, and the revelation of novel structures within these spacetimes.