Brane theory predicts that the tension of hidden dimensions affects black holes in dense clusters. By modeling the environment as an anisotropic Einstein cluster, physicists discovered that finite tension weakens gravity and prevents horizon formation. The effect is maximal for holes lighter than the Sun and is consistent with neutron star observations. Curiously, the black hole's shadow grows while the Einstein ring radius shrinks — together they serve as a tool for measuring brane tension.
Our Universe behaves like a stretched elastic sheet: massive bodies dent it, creating spacetime curvature — gravity. In brane-world theory, a hidden dimension is added, and this sheet becomes just a surface in a higher-dimensional space. The brane tension determines how much the sheet dents: the weaker the tension, the weaker the gravity.
Scientists have studied how this affects black holes of the Schwarzschild type, surrounded by a dense cloud of particles. For light holes (less than a star's mass), the weakened gravity might not form a horizon — the boundary from which nothing can escape. Constraints on brane tension come from observations of neutron stars.
An unexpected effect: the black hole's shadow grows while the Einstein ring — the luminous halo around it — shrinks. Measuring these two parameters could reveal the presence of extra dimensions.
🎯 If brane tension disappeared, our Universe would become completely flat and devoid of gravity.
🎬 In the film *Interstellar*, highly advanced beings live in five dimensions — much like the brane idea from scientific theories.