### worldline

**(world line)**
(path of an object through space and time)

A **worldline** (or **world line**)
is the path of an object through time and space.
Ignoring relativistic effects,
this corresponds to a function mapping time to position.
Given relativity,
such a mapping depends upon the frame of reference.
A worldline is defined within a 4-dimensional spacetime
in which the path through time and space is unique,
such that the equivalent line in any frame of reference
can be produced through a transformation implied
by the relativity theory (there is a transformation
associated with special relativity and a more complex one for general relativity).
Spacetime diagrams attempt to show some of
the characteristics of worldlines.

(*physics,relativity*)
**Further reading:**

http://en.wikipedia.org/wiki/World_line

**Referenced by pages:**

spacetime diagram

Index