Gravitational Collapse and Spacetime Dynamics

Gravitational collapse denotes the irreversible contraction of a massive body under its own gravity, leading to extreme spacetime curvature and, in classical general relativity, the formation of singularities hidden or exposed by event horizons. This process underpins the birth of black holes, the fate of massive stars, and the dynamics of compact objects such as neutron stars. Beyond the asymptotic formation of horizons, modern research has revealed intricate threshold behaviour near black-hole formation, characterised by universal scaling laws and self-similar solutions. The non-linear character of Einstein’s field equations governs the time evolution of geometry, matter and radiation, giving rise to phenomena such as critical collapse, dynamical horizons and gravitational-wave emission. Extensions to alternative theories of gravity, including higher-order curvature corrections, probe the robustness of collapse scenarios and the interplay between classical singularities and potential quantum effects. Studies of light propagation in evolving spacetimes have further connected theoretical predictions with observations, for example through the temporal evolution of photon spheres and shadows. Together, these developments paint a comprehensive picture of spacetime dynamics during collapse, with implications for fundamental physics, astrophysical modelling and the interpretation of high-resolution astronomical data.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Gravitational Collapse and Spacetime Dynamics publication trend

The graph below shows the total number of articles in gravitational collapse and spacetime dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Gravitational collapse: The process by which a self-gravitating mass contracts under its own gravity, potentially forming a black hole or singularity.

Spacetime singularity: A region where curvature invariants diverge and the classical description of spacetime breaks down.

Event horizon: A boundary in spacetime beyond which signals cannot escape to distant observers.

Photon sphere: A closed circular orbit of light around a compact object, marking the region of strong light bending.

Critical phenomena: Threshold behaviour in collapse characterised by universality, scale invariance and power-law scaling of black-hole mass near the formation threshold.

References

1. Critical collapse for the Starobinsky R2 model. Journal of High Energy Physics (2023).
2. Dynamical photon spheres in charged black holes and naked singularities. European Physical Journal C (2024).
3. Critical Phenomena in Gravitational Collapse. Living Reviews in Relativity (2007).