Space-Time Approach to Quantum Electrodynamics
R. P. Feynman
Phys. Rev. 76 (1949) 769
Screened modified gravity is inherently elusive: screening mechanisms suppress the propagation of additional gravitational degrees of freedom in typical astrophysical scenarios, allowing these theories to avoid constraints coming from weak field observations.
Ultralight bosonic fields are compelling dark-matter candidates and arise in a variety of beyond-Standard-Model scenarios. These fields can tap energy and angular momentum from spinning black holes through superradiant instabilities, during which a macroscopic bosonic condensate develops around the black hole.
João Oliveira successfully defended his Ph.D. thesis on Friday 20th November 2020. The committee, presided by Prof. A. Botelho and composed by Profs. D. Astefanesi, M. Zilhão, M. Piedade Ramos, E. Radu and C. Herdeiro (advisor) unanimously approved the thesis entitled "Aspects of Einstein-Maxwell-scalar models: Solitons, Duality and Scalarisation". Congratulations João!
The 2020 FCT call for Scientific Research & Technological Development projects had 5847 applications, of which 3317 were considered eligible and 312 recommended for funding. In the Physical Sciences panel there were 139 applications; Gr@v's project, led by C.Herdeiro, a synergy between the different expertise of the group (strong gravity, astrophysics and high energy physics) was ranked first.
Four new research students have joined Gr@v this fall: Jenzhi Yang, Ivo Sengo, Vasileios Vatellis and João Pino. Welcome!
Nicolas Sanchis-Gual, the only member of the LIGO-Virgo-Kagra collaboration working in Portugal, officially joined Gr@v and our research unit CIDMA. After his Ph.D. from the University of Valencia, Nico worked as a postdoctoral researcher at CENTRA-IST. He is an expert on Numerical Relativity and Gravitational Waves from dynamical binaries. Welcome Nico!
Quantum gravitational effects in the near-horizon region of a black hole may drastically change the classical desc
A call for an Initial Level Doctorate Researcher in Particle Physics at our group is opened. Deadline: 12th of November 2020.