>>12194231>String TheoryCringe. If you have a limit for the minimum length and energy density in the universe (which we do), then 1D strings that are one Planck length in length and one Planck mass in combined mass-energy would create an instant vacuum decay due to the breaking of these constants.
If there is one string, that has one Planck mass and one Planck length (call this 1 ‘Lp’) then that Lp cannot be split any further, whatsoever. However, if a string truly vibrates, then it couldn’t extend into other Lps, as any vibrating parts of a string that can ‘stretch’ into another Lp would make the actual string’s density get split into distinct Lps, violating the rule I just put in place.
OK, you may say; what if we just limit the strings to stay in one Lp all the time, never being able to cross into others?Well, you have another problem. Considering nothing can be smaller than one Lp, it will have to constantly be at one energy state to fill the whole Lp: however, strings oscillate in string theory, which determines the type of fundamental particle it makes up—electrons, quarks, ect.
If strings do oscillate, then any time it’s changing oscillation (such as when quarks change colors), it violates the law we just put down.
Therefore, strings could not exist in 3+1 dimensions. That’s why physicists put so many Unobservable dimensions to try to get around this problem. Even with Unobservable dimensions, it can’t be allowed. The information that would be needed to be sent through several Unobservable compartmentalized dimensions would, themselves, have to be limited to one Lp, which brings up the whole problem again.
