Can we view the string theory as defined on special 2-D time?

[Osiris]

Since now time is 2-dimensional, coordinates of points X\mu are dependent on both (\tau1, \tau2), and
if \tau2 is infinite, it's a open string;
if \tau2 is finite, it's a closed string.


How do you think so?

[arivero]

It is so, but it is not a second time, just a parameter, lets call sigma (for "space"). What you say is called the "worldsheet point of view", as oppossed to the 4D (or 10D) "space time point of view".

[crackjack]

As long as a (any) system has only one past and one future, it will have just one time parameter. There may be theories with signatures like (- - + + +...) - as in F-theory - but that alone does not mean it is a two-timed theory.