Strong Gravity

The group's research on strong gravity involves finding analytical and numerical solutions of Einstein's theory of general relativity, and many of its extensions, either in vacuum or coupled to various types of matter. For our latest developments/activities in this area, please see the listing at the end of this article.

The prime examples of (relativistic) strong gravitational systems are Black Holes. They are truly unifying objects of all physics. The understanding of their formation and dynamics requires the laws of all four fundamental forces, and their physics is relevant not only for astrophysics and cosmology but for a variety of topics within high energy physics.

See here a movie made by the COST action `Black holes in a violent universe', in which our group participates, for a visual overview of different types of black holes.

Latest Strong Gravity Publications

Eccentric mergers of binary Proca stars, G. Palloni, N. Sanchis-Gual, J. A. Font, C. Herdeiro, E. Radu; arXiv:2504.10235 [gr-qc].

Publication type
Regular Articles
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Proto-neutron star oscillations including accretion flows, D. Tseneklidou, R. Luna, P. Cerdá-Durán, A. Torres-Forné; arXiv:2503.16317 [astro-ph.HE].

Publication type
Regular Articles
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Gregory-Laflamme-type instability of boson strings and related phases in D=5 Kaluza-Klein theory, C. A. R. Herdeiro, E. Radu; arXiv:2503.15069 [gr-qc].

Publication type
Regular Articles
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Backreaction of perturbations around a stable Light Ring, P.V.P. Cunha; arXiv:2503.00117 [gr-qc]

Publication type
Regular Articles
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General relativistic quasi-spherical accretion in a dark matter halo, R. Ranjbar, H. R. Olivares-Sánchez; arXiv:2502.12072 [astro-ph.HE]

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Regular Articles
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See Strong Gravity publications

Latest Strong Gravity News & Events

Visual Signatures of Scalar Hair in the Images of Accretion Disks and Shadows of Rotating Hairy Black Holes

GGD - Gr@V Seminar
Speaker
Galin Gyulchev (Sofia University “St. Kliment Ohridski”)
Event date
Venue
On-site: room TBD
Event Website
https://videoconf-colibri.zoom.us/j/95541308539?pwd=GXnfP6VYVU82NHwP3ZEevFxw3si…
Event type
Seminars

We examine the images and shadows of thin accretion disks around rotating hairy black holes characterized by two non-trivial, time-periodic scalar fields, whose target space possesses non-flat Gaussian curvature.

Strong Gravity
Astrophysics

Gonçalo Gonçalves

Full Name: Goncalo Filipe Mota GoncalvesGonçalo Gonçalves
 

Postion: PhD Student
 

Degrees: Msc in Theoretical Physics, Faculty of Sciences of the University of Porto, 2024; BSC in Physics, Faculty of Sciences of the University of Coimbra, 2021
 

Strong Gravity
Astrophysics

Nonlinearities in black hole ringdown

GGD - Gr@V Seminar
Speaker
Adrien Kuntz (CENTRA, IST)
Event date
Venue
Hybrid: room 11.2.21 and Zoom
Event Website
https://videoconf-colibri.zoom.us/j/95541308539?pwd=GXnfP6VYVU82NHwP3ZEevFxw3si…
Event type
Seminars

Nonlinear effects in black hole perturbation theory may be important for describing a black hole ringdown, as suggested by recent works. I will describe a new class of "quadratic" quasi-normal modes at second order in perturbation theory. Remarkably, not only their frequency but also their amplitude is completely determined by the linear modes themselves.

Strong Gravity
See Strong Gravity News & Events