Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun Plural form of
worldline .
Etymologies
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Examples

I am talking about Minkowski distances associated with two photon worldlines.

Likewise, we know how to deal with the quantum blurriness of worldlines.

In quantum mechanics worldlines are somewhat blurred because of Heisenberg's uncertainty relation, Δx Δp h/2π.

I am talking about Minkowski distances associated with two photon worldlines.

Per Feynman, a particle travels from point A to point B along all possible worldlines.

In this context, we can hardly justify the exclusion of gravitation, considering that the very same metrical field which determines the inertial worldlines also represents the gravitational field. link

Now, IIRC it is Linde himself who has pointed out that one can push infimum of worldlines unboundedly back, making the process physically "eternal" in both directions.
If We Live in a Multiverse, How Many Are There?  Universe Today

The authors go through a lot of possible ways of calculating the number of universes in eternal inflation, but all along from the perspective of an observer having access to worldlines that are boundedly related by an initial condition.
If We Live in a Multiverse, How Many Are There?  Universe Today

In other words, the ship can travel along spacelike worldlines.

In this context, we can hardly justify the exclusion of gravitation, considering that the very same metrical field which determines the inertial worldlines also represents the gravitational field.
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