Time Dilation
Different worldlines near strong gravity accumulate different proper times. This enables future-directed differential aging, not automatic travel to the past.
GENERAL RELATIVITY / QUANTUM FRONTIER / COSMOLOGY
Black Holes, Horizons & Cosmological Time
Black holes test temporal geometry locally and regionally. Cosmology asks how temporal structure behaves across the history, boundaries, and possible future of the universe.
Black Holes as Temporal Laboratories
Horizons
An event horizon is a causal boundary, not a material surface or established portal.
Rotation
Kerr geometry produces frame dragging, ergospheres, rotational-energy access, and difficult inner-horizon physics.
Cosmological Temporal Structure
Cosmic Time
A natural large-scale parameter in homogeneous cosmological models, not Newtonian absolute time.
Low-Entropy Past
The early universe’s smooth gravitational state is central to explaining the arrow of time.
Horizons & Deep Time
Accelerated expansion can isolate regions permanently and constrain any long-lived civilization.
Beginnings & Endings
The Big Bang is the boundary of classical extrapolation; bounces, cycles, heat death, vacuum decay, and other futures remain model-dependent.
Claim boundary: black holes are extreme spacetime structures and powerful research environments. They are not infinite energy sources or automatic time machines.