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Polarimetry and Astrometry of NIR Flares as Event Horizon Scale, Dynamical Probes for the Mass of Sgr A*
The GRAVITY Collaboration, R. Abuter, N. Aimar +66
We present new astrometric and polarimetric observations of flares from Sgr A* obtained with GRAVITY, the near-infrared interferometer at ESO's Very Large Telescope Interferometer…
Black Holes as Fermion Factories
Yifan Chen, Xiao Xue, Vitor Cardoso
Ultralight bosons near rotating black holes can undergo significant growth through superradiant energy extraction, potentially reaching field values close to the Planck scale and t…
On energy extraction from Q-balls and other fundamental solitons
Vitor Cardoso, Rodrigo Vicente, Zhen Zhong
Energy exchange mechanisms have important applications in particle physics, gravity, fluid mechanics, and practically every field in physics. In this letter we show, both in freque…
Piercing of a solitonic boson star by a black hole
Zhen Zhong, Vitor Cardoso, Taishi Ikeda +1
Recently, the piercing of a mini boson star by a black hole was studied, with tidal capture and the discovery of a "gravitational atom" being reported ( arXiv:2206.00021 [gr-qc] ).…
Spinning Black Holes with Axion Hair
Clare Burrage, Pedro G. S. Fernandes, Richard Brito +1
In this work we construct and analyse non-perturbative stationary and axially-symmetric black hole solutions in General Relativity coupled to an electromagnetic and an axion field.…
Using the motion of S2 to constrain scalar clouds around SgrA*
GRAVITY Collaboration, A. Foschi, R. Abuter +67
The motion of S2, one of the stars closest to the Galactic Centre, has been measured accurately and used to study the compact object at the centre of the Milky Way. It is commonly…
Superradiance: Axionic Couplings and Plasma Effects
Thomas F. M. Spieksma, Enrico Cannizzaro, Taishi Ikeda +2
Spinning black holes can transfer a significant fraction of their energy to ultralight bosonic fields via superradiance, condensing them in a co-rotating structure or "cloud". This…
Message in a bottle: energy extraction from bouncing geometries
Vitor Cardoso, João L. Costa, José Natário +1
Quantum gravity phenomenology suggests the interesting possibility that black holes are not eternal. Collapse could be halted by some unknown mechanism, or Hawking radiation might…
Key Science Goals for the Next-Generation Event Horizon Telescope
Michael D. Johnson, Kazunori Akiyama, Lindy Blackburn +42
The Event Horizon Telescope (EHT) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy M87 and the Milky Way. Pr…
Eternal binaries
Jaime Redondo-Yuste, Vitor Cardoso, Caio F. B. Macedo +1
The two-body problem is extensively studied in open systems and asymptotically flat spacetimes. However, there are many systems where radiation is trapped: they range from radiatin…
Constraints on massive gravity from dipolar mode excitations
Vitor Cardoso, Francisco Duque, Andrea Maselli +1
We study extreme-mass-ratio systems in theories admitting the Schwarzschild solution and propagating a massive graviton. We show that, in addition to small corrections to the quadr…
Black holes surrounded by generic dark matter profiles: appearance and gravitational-wave emission
Enzo Figueiredo, Andrea Maselli, Vitor Cardoso
We develop a numerical approach to find asymptotically flat black hole solutions coupled to anisotropic fluids, described by generic density profiles. Our model allows for a variet…
Where intermediate-mass black holes could hide in the Galactic Centre: A full parameter study with the S2 orbit
The GRAVITY Collaboration, O. Straub, M. Bauböck +59
In the Milky Way the central massive black hole, SgrA*, coexists with a compact nuclear star cluster that contains a sub-parsec concentration of fast-moving young stars called S-st…
Electromagnetic radiation reaction and energy extraction from black holes: The tail term cannot be ignored
João S. Santos, Vitor Cardoso, José Natário
We study electromagnetic radiation reaction in curved space and the dynamics of radiating charged particles. The equation of motion for such particles is the DeWitt-Brehme equation…
Agnostic black hole spectroscopy: Quasinormal mode content of numerical relativity waveforms and limits of validity of linear perturbation theory
Vishal Baibhav, Mark Ho-Yeuk Cheung, Emanuele Berti +5
Black hole spectroscopy is the program to measure the complex gravitational-wave frequencies of merger remnants, and to quantify their agreement with the characteristic frequencies…
Normal modes of Proca fields in AdS spacetime
Tiago V. Fernandes, David Hilditch, José P. S. Lemos +1
A normal mode analysis for Proca fields in the anti-de Sitter (AdS) spacetime is given. It is found that the equations for the Proca field can be decoupled analytically. This is pe…