Cosmological Dynamics of Black Holes
Summary
Black holes, traditionally studied as isolated entities, are increasingly recognised as integral components of the evolving cosmos. Cosmological dynamics explores how black hole properties—particularly mass and spin—respond to the large-scale expansion of the universe and its underlying geometry. Theoretical models embed black holes within a Friedmann–Lemaître–Robertson–Walker background, revealing mechanisms by which cosmic expansion may drive mass growth independent of accretion or mergers. These frameworks employ quasi-local mass definitions to quantify the interplay between a black hole’s immediate gravitational field and the surrounding spacetime. Observationally, analyses of supermassive black holes across cosmic time suggest trends consistent with coupling to the cosmic scale factor, prompting hypotheses that populations of stellar-remnant black holes could contribute an effectively constant energy density akin to vacuum energy. Meanwhile, the detection of compact binaries via gravitational waves provides novel tests of cosmological coupling, as inferred masses at merger may bear signatures of past expansion-driven growth. Together, theory and observation form a coherent picture in which black holes participate dynamically in cosmic evolution, with implications for dark energy, galaxy formation and the interpretation of gravitational-wave signals.
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Cosmological Dynamics of Black Holes publication trend
The graph below shows the total number of articles in cosmological dynamics of black holes across all publications each year (not limited to Nature Index journals).
Technical terms
Cosmological coupling: A proposed link between black hole mass and the expansion of the universe, implying mass growth scales with the cosmic scale factor.
Scale factor (a): A dimensionless function describing the relative expansion of the universe over time in cosmological models.
Friedmann–Lemaître–Robertson–Walker metric: A solution to Einstein’s equations assuming a homogeneous and isotropic universe, providing the framework for cosmic expansion.
Misner–Sharp mass: A quasi-local mass measure in general relativity that captures the energy content within a spherical region of spacetime.
Apparent horizon: A surface on which outgoing light rays momentarily halt, used to characterise dynamical black holes in non-stationary spacetimes.
Kerr black hole: The solution of Einstein’s equations describing a rotating black hole, foundational for modelling spin dynamics in astrophysical contexts.
References
- Observational Evidence for Cosmological Coupling of Black Holes and its Implications for an Astrophysical Source of Dark Energy. The Astrophysical Journal Letters (2023).
- Cosmological coupling of nonsingular black holes. Journal of Cosmology and Astroparticle Physics (2023).
- Constraints on cosmologically coupled black holes from gravitational wave observations and minimal formation mass. Monthly Notices of the Royal Astronomical Society (2024).
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