Does the length of a string depend on it's energy?

  • #1
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Main Question or Discussion Point

Does the length of a string depend on its energy, or does its energy depend on its length? Similarly, does the area of a d brane depend on its energy, or does its energy depend on its energy?
Are these stupid questions?
 

Answers and Replies

  • #2
haushofer
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Well, if x(y) is a function of y, then y(x) is a function of x, whether you can explicitly write it down or not :P
 
  • #3
Urs Schreiber
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Well, if x(y) is a function of y, then y(x) is a function of x,
If the function is single valued, at least (which of course it is in the OP's question). Otherwise one gets a relation, not a function.
 
  • #5
Urs Schreiber
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That's what I meant by the part you left out.
Okay. To me there is a difference between a function that has no "explicit expression" (say the Gauss error function), and a relation which simply does not map arguments to values at all. But anyway, it's not worth arguing about this much further here.
 

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