# Black-hole microstate spectroscopy: Ringdown, quasinormal modes, and echoes

@article{Ikeda2021BlackholeMS, title={Black-hole microstate spectroscopy: Ringdown, quasinormal modes, and echoes}, author={Taishi Ikeda and Massimo Bianchi and Dario Consoli and Alfredo Grillo and Jos{\`e} Francisco Morales and Paolo Pani and Guilherme Raposo}, journal={Physical Review D}, year={2021} }

Deep conceptual problems associated with classical black holes can be addressed in string theory by the “fuzzball” paradigm, which provides a microscopic description of a black hole in terms of a thermodynamically large number of regular, horizonless, geometries with much less symmetry than the corresponding black hole. Motivated by the tantalizing possibility to observe quantum gravity signatures near astrophysical compact objects in this scenario, we perform the first 3 + 1 numerical…

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## References

SHOWING 1-10 OF 143 REFERENCES

### Gravitational Waves, Holography, and Black Hole Microstates

- Physics
- 2020

Gravitational wave observations of the near-horizon region of black holes lend insight into the quantum nature of gravity. In particular, gravitational wave echoes have been identified as a potential…

### Black holes and gravitational waves in models of minicharged dark matter

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

In viable models of minicharged dark matter, astrophysical black holes might be charged under a hidden U(1) symmetry and are formally described by the same Kerr-Newman solution of Einstein-Maxwell…

### Effective field theory of black hole echoes

- PhysicsJournal of High Energy Physics
- 2018

A bstractGravitational wave ‘echoes’ during black-hole merging events have been advocated as possible signals of modifications to gravity in the strong-field (but semiclassical) regime. In these…

### How does a dark compact object ringdown?

- Physics
- 2020

A generic feature of nearly out-of-equilibrium dissipative systems is that they resonate through a set of quasinormal modes. Black holes - the absorbing objects par excellence - are no exception.…

### Black Hole Ringdown: The Importance of Overtones

- PhysicsPhysical Review X
- 2019

It is possible to infer the mass and spin of the remnant black hole from binary black hole mergers by comparing the ringdown gravitational wave signal to results from studies of perturbed Kerr…

### Echoes from braneworld black holes

- Physics
- 2020

The holographic interpretation of the Randall-Sundrum model based on the adaptation of the AdS/CFT correspondence to the braneworld scenario states that the black holes localized on the brane are…

### Exotic Compact Objects and How to Quench their Ergoregion Instability

- Physics, Geology
- 2017

Gravitational-wave astronomy can give us access to the structure of black holes, potentially probing microscopic or even Planckian corrections at the horizon scale, as those predicted by some…

### Distinguishing Fuzzballs from Black Holes through Their Multipolar Structure.

- PhysicsPhysical review letters
- 2020

Numerical evidence is found that all multipole moments are typically larger than those of a Kerr black hole with the same mass and spin, which provides a portal to constrain fuzzball models phenomenologically.

### Lensing and dynamics of ultracompact bosonic stars

- Physics
- 2017

Spherically symmetric bosonic stars are one of the few examples of gravitating solitons that are known to form dynamically, via a classical process of (incomplete) gravitational collapse. As…

### Not quite a black hole

- Physics
- 2017

Astrophysical black hole candidates, although long thought to have a horizon, could be horizonless ultracompact objects. This intriguing possibility is motivated by the black hole information paradox…