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Testing the nature of dark compact objects: a status report
Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime
Superradiance is a radiation enhancement process that involves dissipative systems. With a 60 year-old history, superradiance has played a prominent role in optics, quantum mechanics and especially
Is the Gravitational-Wave Ringdown a Probe of the Event Horizon?
It is pointed out that this assumption that very compact objects with a light ring will display a similar ringdown stage, even when their quasinormal-mode spectrum is completely different from that of a black hole, is wrong.
Testing strong-field gravity with tidal Love numbers
The tidal Love numbers (TLNs) encode the deformability of a self-gravitating object immersed in a tidal environment and depend significantly both on the object's internal structure and on the
Black holes as particle detectors: evolution of superradiant instabilities
Superradiant instabilities of spinning black holes can be used to impose strong constraints on ultralight bosons, thus turning black holes into effective particle detectors. However, very little is
Testing general relativity with present and future astrophysical observations
One century after its formulation, Einstein's general relativity (GR) has made remarkable predictions and turned out to be compatible with all experimental tests. Most of these tests probe the theory
Equation-of-state-independent relations in neutron stars
Neutron stars are extremely relativistic objects which abound in our universe and yet are poorly understood, due to the high uncertainty on how matter behaves in the extreme conditions which prevail
Perturbed black holes in Einstein-dilaton-Gauss-Bonnet gravity: Stability, ringdown, and gravitational-wave emission
Gravitational waves emitted by distorted black holes\char22{}such as those arising from the coalescence of two neutron stars or black holes\char22{}carry not only information about the corresponding
Slowly rotating black holes in alternative theories of gravity
We present, in closed analytic form, a general stationary, slowly rotating black hole, which is a solution to a large class of alternative theories of gravity in four dimensions. In these theories,
Superradiance: Energy Extraction, Black-Hole Bombs and Implications for Astrophysics and Particle Physics
Introduction.- Superradiance in flat spacetime.- Superradiance in black hole physics.- Black holes and superradiant instabilities.- Black hole superradiance in astrophysics.- Conclusions and Outlook.