I’m currently reading a Robert Heinlein book, The Pursuit
of the Pankera (The
Pursuit of the Pankera | Arc Manor Books), in which a group of time-space
travelers devised a machine to travel through parallel universes. The key to
their machine is they discover that there are three dimensions of space and
three dimensions of time. The book’s theme led me to look up how theorists have
speculated that there may be more than one dimension of time.
There turns out to be quite several theories about multiple
dimensions of time. Enough so there is a Wikipedia page dedicated to the topic:
Multiple time
dimensions - Wikipedia.
Some of theories include compact time dimensions analogous to
the spatial dimensions of string theory, two time dimensions in which one is in
real time and one is in imaginary time as with complex numbers, and multiple
time dimensions similar to conventional time.
Beyond Heinlein, other popular authors have employed multiple
time dimensions including C. S. Lewis (https://en.wikipedia.org/wiki/Chronicles_of_Narnia)
and J. R. R. Tolkien (https://en.wikipedia.org/wiki/The_Lord_of_the_Rings).
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