Dictionary

antihorizon en · NOUN

Etymology

From anti- + horizon.

Meanings

1. The opposite of an event horizon, allowing escape but not entry.
   • White holes must therefore be surrounded by the opposite of an event horizon, something known as an antihorizon, which would allow one-way traffic out and never in. Unfortunately, antihorizons are very unstable and get converted to normal horizons in a matter of seconds after forming. 2002, Jim Al-Khalili, Black Holes, Wormholes and Time Machines, page 199:
   • To distant observers the light appears, due to gravitational time dilation, to slow down as it approaches the antihorizon. 2010, Enrico Rodrigo, The Physics of Stargates:
   • The Kruskal diagram of the Schwarzschild geometry showed it to possess not only a normal horizon but also an antihorizon, beyond which there was, supposedly, another Universe. 2009, Jon Schiller, 21st Century Cosmology, page 54:

Forms