The Universal Sound of Black Holes

31. July 2023

They are mysterious, exciting and inescapable – black holes are some of the most exotic objects in the Universe. With gravitational-wave detectors, it is possible to detect the chirp sound that two black holes produce when they merge, approximately 70 such chirps have been found so far. A team of researchers at the Heidelberg Institute for Theoretical Studies (HITS) now predicts that in this “ocean of voices” chirps preferentially occur in two universal frequency ranges. The study has been published in The Astrophysical Journal Letters.

Ripples in the spacetime around a merging binary black-hole system from a numerical relativity simulation. Image credit: Deborah Ferguson, Karan Jani, Deirdre Shoemaker, Pablo Laguna, Georgia Tech, MAYA Collaboration.

The discovery of gravitational waves in 2015 – already postulated by Einstein one hundred years ago – led to the 2017 Nobel Prize in Physics and initiated the dawn of gravitational-wave astronomy. When two stellar-mass black holes merge, they emit gravitational waves of increasing frequency, the so-called chirp signal, that can be “heard” on Earth (see Movie). From observing this frequency evolution (the chirp), scientists can infer the so-called “chirp mass”,  a mathematical combination of the two individual black hole masses.

So far, it has been assumed that the merging black holes can have any mass. The team’s models, however, suggest that some black holes come in standard masses that then result in universal chirps. “The existence of universal chirp masses not only tells us how black holes form”, says Fabian Schneider, who led the study at HITS, “it can also be used to infer which stars explode in supernovae.” Apart from that it provides insights into the supernova mechanism, uncertain nuclear and stellar physics, and provides a new way for scientists to measure the accelerated cosmological expansion of the Universe.

“Severe consequences for the final fates of stars”

Figure 1: Artist’s impression of mass transfer in a massive binary star. Credit: ESO/M. Kornmesser/S.E. de Mink,

Stellar-mass black holes with masses of approximately 3-100 times our Sun are the endpoints of massive stars that do not explode in supernovae but collapse into black holes. The progenitors of black holes that lead to mergers are originally born in binary star systems and experience several episodes of mass exchange between the components (Figure 1, and Movie 2): in particular, both black holes are from stars that have been stripped off their envelopes. “The envelope stripping has severe consequences for the final fates of stars. For example, it makes it easier for stars to explode in a supernova and it also leads to universal black hole masses as now predicted by our simulations”, says Philipp Podsiadlowski from Oxford University, second author of the study and currently Klaus Tschira Guest Professor at HITS.

Figure 2: Masses in the stellar graveyard (in units of solar mass). The figure shows inferred gravitational masses of neutron stars and black holes from electromagnetic (EM) and gravitational-wave observations (LIGO-Virgo-KAGRA). Arrows connect two merging compact objects and their merged remnant as seen by gravitational-wave emissions. Visualization credits: LIGO-Virgo-KAGRA / Aaron Geller / Northwestern.

The “stellar graveyard” (Figure 2) – a collection of all known masses of the neutron-star and black-hole remains of massive stars – is quickly growing thanks to the ever-increasing sensitivity of the gravitational-wave detectors and ongoing searches for such objects. In particular, there seems to be a gap in the distribution of the chirp masses of merging binary black holes, and evidence emerges for the existence of peaks at roughly 8 and 14 solar masses (Figure 3, see below). These features correspond to the universal chirps predicted by the HITS team. “Any features in the distributions of black-hole and chirp masses can tell us a great deal about how these objects have formed”, says Eva Laplace, the study’s third author.

Not in our galaxy: Black holes with much larger masses

Ever since the first discovery of merging black holes, it became evident that there are black holes with much larger masses than the ones found in our Milky Way. This is a direct consequence of these black holes originating from stars born with a chemical composition different from that in our Milky Way Galaxy. The HITS team could now show that – regardless of the chemical composition – stars that become envelope-stripped in close binaries form black holes of <9 and >16 solar masses but almost none in between.

Figure 3: Distribution of the chirp masses of all binary black-hole mergers observed today. The top panel shows the raw data and probability distributions of the chirp masses of each individual event while the bottom panel shows a model inferred from the combined observations. The gap in chirp masses at 10–12 solar masses and the so-far identified features at about 8, 14, 27 and 45 solar masses are indicated. Figure reproduced from Abbott et al. 2021.

In merging black holes, the universal black-hole masses of approximately 9 and 16 solar masses logically imply universal chirp masses, i.e. universal sounds. “When updating my lecture on gravitational-wave astronomy, I realized that the gravitational-wave observatories had found first hints of an absence of chirp masses and an overabundance at exactly the universal masses predicted by our models”, says Fabian Schneider. “Because the number of observed black-hole mergers is still rather low, it is not clear yet whether this signal in the data is just a statistical fluke or not”.

Whatever the outcome of future gravitational-wave observations: the results will be exciting and help scientists understand better where the singing black holes in this ocean of voices come from.

Fabian R. N. Schneider, Philipp Podsiadlowski, and Eva Laplace: Bimodal Black Hole Mass Distribution and Chirp Masses of Binary Black Hole Mergers. The Astrophysical Journal Letters, 950, 2, DOI 10.3847/2041-8213/acd77a,

The project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 945806).


  • Movie 1: Journey of the first gravitational wave detected on Earth. Credit: LIGO/SXS/R.Hurt and T. Pyle:
  • Movie 2: Evolution of a massive binary star through a phase of mass transfer. The more massive star evolves faster and expands. The expansion results in the transfer of the outer layers onto the companion. The first supernova is from a star that has been stripped off its envelope. Credit: ESO/L. Calçada/M. Kornmesser/S.E. de Mink

About HITS

HITS, the Heidelberg Institute for Theoretical Studies, was established in 2010 by physicist and SAP co-founder Klaus Tschira (1940-2015) and the Klaus Tschira Foundation as a private, non-profit research institute. HITS conducts basic research in the natural, mathematical, and computer sciences. Major research directions include complex simulations across scales, making sense of data, and enabling science via computational research. Application areas range from molecular biology to astrophysics. An essential characteristic of the Institute is interdisciplinarity, implemented in numerous cross-group and cross-disciplinary projects. The base funding of HITS is provided by the Klaus Tschira Foundation.

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