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

Self-interactions can stabilize excited boson stars, Nicolas Sanchis-Gual, Carlos Herdeiro, Eugen Radu; arXiv:2110.03000 [gr-qc]

Publication type
Regular Articles
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Virial identities in relativistic gravity: 1D effective actions and the role of boundary terms, Carlos A. R. Herdeiro, João M. S. Oliveira, Alexandre M. Pombo, Eugen Radu; Accepted in Phys. Rev. D (2021), arXiv:2109.05027 [gr-qc].

Publication type
Regular Articles
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GWTC-2.1: Deep Extended Catalog of Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run; LIGO Scientific, VIRGO and KAGRA Collaborations, R. Abbott et al. (includes N. Sanchis-Gual); arXiv:2108.01045 [gr-qc].

Publication type
Regular Articles
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All-sky search for long-duration gravitational-wave bursts in the third Advanced LIGO and Advanced Virgo run; LIGO Scientific, VIRGO and KAGRA Collaborations, R. Abbott et al. (includes N. Sanchis-Gual); arXiv:2107.13796 [gr-qc].

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Regular Articles
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Compact elastic objects in general relativity, Artur Alho, José Natário, Paolo Pani, Guilherme Raposo; arXiv:2107.12272 [gr-qc].

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Regular Articles
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Latest Strong Gravity News & Events

The Black Hole Photon Ring

Speaker
Alex Lupsasca (Princeton University)
Event date
Venue
online (only)
Event type

The photon ring is a narrow ring-shaped feature, predicted by General Relativity but not yet observed, that appears on images of sources near a black hole. It is caused by extreme bending of light within a few Schwarzschild radii of the event horizon and provides a direct probe of the unstable bound photon orbits of the Kerr geometry.