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

Deconstructing scaling virial identities in General Relativity: spherical symmetry and beyond, C. A. R. Herdeiro, J. M.S. Oliveira, A. M. Pombo, E. Radu; arXiv:2206.02813 [gr-qc].

Publication type
Regular Articles
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Searching for vector boson-star mergers within LIGO-Virgo intermediate-mass black-hole merger candidates, J. C. Bustillo (w/ C. A. R. Herdeiro and E. Radu); arXiv:2206.02551 [gr-qc].

Publication type
Regular Articles
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On interplay between flavour anomalies and neutrino properties, F. F. Freitas, J. Gonçalves, A. P. Morais, R. Pasechnik, W. Porod;      arXiv:2206.01674 [hep-ph].

Publication type
Regular Articles
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Gravitational-wave parameter inference with the Newman-Penrose scalar, J. C. Bustillo et al. (w/ C. A. R. Herdeiro and E. Radu);      arXiv:2205.15029 [gr-qc].

Publication type
Regular Articles
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The piercing of a boson star by a black hole, V. Cardoso, T. Ikeda, Z. Zhong and M. Zilhão; arXiv:2206.00021 [gr-qc].

Publication type
Regular Articles
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Latest Strong Gravity News & Events

Gravitational waves from spontaneously scalarized black holes

Speaker
Leong Khim Wong (Université Paris-Saclay)
Event date
Venue
Only on campus (Sala Sousa Pinto)
Event type
Certain scalar-tensor theories remain viable despite stringent observational constraints from the Solar System due to a Z_2 symmetry that keeps the scalar field dormant in the weak-field regime. However, extreme-gravity environments can trigger a phase transition that promotes the spontaneous growth of the scalar field around compact objects like black holes and neutron stars.

Universal relations for rotating Boson Stars

Speaker
Castelo Mourelle Jorge (Universidad de Santiago de Compostela)
Event date
Venue
online (only)
Event type

Boson stars are hypothetical but widely considered exotic compact objects known as ``black-hole mimickers” whose mergers may produce gravitational-wave emissions observable by current ground-based detectors like Advanced LIGO and Virgo.