«BLACK HOLES TRIPTYCH»
The boundary beyond which events cannot ever be observed is an event horizon, and it represents the maximum extent of the particle horizon.
The criterion for determining whether a particle horizon for the universe exists is as follows. Define a comoving distance dp as seen on the pictures
In this equation, a is the scale factor, c is the speed of light, and t0 is the age of the Universe. If dp → ∞ (i.e., points arbitrarily as far away as can be observed), then no event horizon exists. If dp ≠ ∞, a horizon is present.
The criterion for determining whether a particle horizon for the universe exists is as follows. Define a comoving distance dp as seen on the pictures
In this equation, a is the scale factor, c is the speed of light, and t0 is the age of the Universe. If dp → ∞ (i.e., points arbitrarily as far away as can be observed), then no event horizon exists. If dp ≠ ∞, a horizon is present.
BLACK HOLES TRIPTYCH
EVENT HORIZON #001
EVENT HORIZON #002
EVENT HORIZON #003
