String theory: gravitons for closed strings vs. open strings

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In string theory, closed strings can produce a graviton, which is a massless particle responsible for mediating gravitational forces. In contrast, the open string spectrum includes a symmetric 2-tensor that is not classified as a graviton due to its mass. This distinction highlights the fundamental differences in the properties of closed and open strings. The presence of mass in the open string spectrum prevents it from fulfilling the criteria necessary to be considered a graviton. Understanding these differences is crucial for further exploration of string theory and its implications for gravity.
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In the spectrum of the closed string, we encountered a graviton. Why is the symmetric 2-tensor in the open string spectrum, not a graviton?
 
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