Oct 23 – 25, 2019
Aula Gerace
Europe/Rome timezone
We had been hoping to be able to hold the conference on the originally scheduled period in October 2021 but given the pandemic situation we have decided to postpone the conference period to October 2022.

Testing The Area Quantisation Hypothesis From Black Hole Ringdown Signals (C)

Oct 24, 2019, 4:45 PM
Aula Gerace

Aula Gerace

Polo Fibonacci Edificio C Largo B. Pontecorvo, 3 56127 Pisa
talk Cosmology Talks on specific topics


Walter Del Pozzo (P)


The idea that the area of a black hole (BH) horizon is quantized goes back to Bekenstein and Mukhanov [1,2,3]. The area is conjectured to be a multiple of the Planck area, but the constant of proportionality α is unknown and depends on the specific theory of quantum gravity. Expanding on this idea, recent studies [4,5] suggested that thermodynamic relations applied to an astrophysical Kerr BH would lead to a “quantized” quasinormal mode (QNM) spectrum that depends explicitly on α. In particular, the central frequencies of the ringdown signal from a BH (a superposition of QNMs) deviate measurably from GR predictions. We propose a method based on Bayesian inference designed to infer the properties of the remnant BHs from a time domain analysis of the ringdown part of the gravitational wave signal. We try to infer α from GW150914 and find that it is not yet measurable. From a population of simulated events observed by second generation instruments at design sensitivity, we investigate the measurability of α and assess potential stealth biases caused by ignoring the BH area quantisation in ringdown analyses.

[1] J. D. Bekenstein, Lettere al Nuovo Cimento (1971-1985) 11, 467 (1974).
[2] V. F. Mukhanov, Pis. Eksp. Teor. Fiz. 44, 50 (1986).
[3] J. D. Bekenstein and V. F. Mukhanov, Phys. Lett. B 360, 7 (1995).
[4] J. D. Bekenstein, Phys. Rev. D 91, 124052 (2015).
[5] V. F. Foit and M. Kleban, Class. Quantum Grav. 36, 035006 (2019).

Primary author

Danny Laghi (INFN - Pisa)


Gregorio Carullo (Istituto Nazionale di Fisica Nucleare) John Veitch (Cardiff University) Walter Del Pozzo (P)

Presentation materials