particle horizon

(redirected from Conformal time)

particle horizon

See horizon distance.

particle horizon

[′pärd·ə·kəl hə‚rīz·ən]
(relativity)
The spatial boundary beyond which, in certain universe models, it is impossible for an observer at a given time to receive a signal.
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Next, it is convenient to introduce the conformal time [eta] = [integral] dt/a(t).
(The instants [eta] = 0, [eta]0, and of the conformal time correspond to the instants t = 0, [t.sub.0], and [t.sub.*] of the physical time in Figure 2.) Since it is commonly assumed that bubbles of the new phase grow at the rate close to the speed of light, their boundaries can be well depicted by the light rays.

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