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Definition/Summary
Abstract from Poisson and Israel’s 1990 paper, ‘Internal structure of black holes’-
‘The gravitational effects associated with the radiative tail produced by a gravitational collapse with rotation are investigated. It is shown that the infinite blueshift of the tail’s energy density occurring at the Cauchy horizon of the resulting black hole causes classically unbounded inflation of the effective internal gravitational-mass parameter of the hole. Since this effect is causally disconnected from any external observer, the black-hole external mass remains bounded. The mass inflation phenomenon causes the spacetime curvature to grow to Planckian scales on a spacelike hypersurface in the vicinity of the Cauchy horizon, beyond which the classical laws of general relativity break down. A consequence is that an observer’s trip to this hypersurface embraces all but the last Planck time of the entire black-hole classical history.’
from ‘Structure of the Inner Singularity...
Mass inflation refers to the rapid expansion of space during the early stages of the universe's existence. This expansion was driven by the strong repulsive force of dark energy, causing particles and matter to be spread out over a larger and larger area.
Mass inflation is responsible for the large-scale structure of the universe we see today. It also explains why the universe appears to be flat, and why the cosmic microwave background radiation is so uniform in all directions.
Mass inflation occurred during the first fractions of a second after the Big Bang, when the universe was still incredibly dense and hot. It lasted for about 10^-33 seconds, after which the universe began to cool and expand at a slower rate.
Several observations support the theory of mass inflation, including the uniformity of the cosmic microwave background radiation, the flatness of the universe, and the large-scale structure of galaxies and galaxy clusters. These observations are consistent with the predictions of mass inflation.
Since mass inflation occurred in the early stages of the universe, it cannot be directly observed or measured. However, scientists can study its effects through observations of the cosmic microwave background radiation and the large-scale structure of the universe. They can also study the behavior of matter and energy at high temperatures and densities in particle accelerators, providing further evidence for the theory of mass inflation.