String theory: gravitons for closed strings vs. open strings

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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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Thread 'Thermodynamic Approaches to Quantum Gravity: Discussion'

Jacobson’s work (1995) [1] demonstrated that Einstein’s equations can be derived from thermodynamic principles, suggesting gravity might emerge from the thermodynamic behavior of spacetime, tied to the entropy of horizons. Other researchers, such as Bekenstein [2] and Verlinde [3], have explored similar ideas, linking gravity to entropy and holographic principles. I’m interested in discussing how these thermodynamic approaches might apply to quantum gravity, particularly at the Planck...
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