This work demonstrates that a density matrix enables the calculation of extended entanglement entropy between string coordinates, suggesting new insights into Hagedorn behavior.
This work demonstrates that a superstring extended density matrix can be defined at finite temperature. This enables the calculation of the extended entanglement entropy between string coordinates. Using a real-time approach, the entanglement entropy is expressed in terms of modular functions, whose proprieties are then used to study Hagedorn behavior.
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Daniel L. Nedel (2025) studied this question.
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