String Entanglement and D-branes as Pure States

Abstract

We study the entanglement of closed strings degrees of freedom in order to investigate the microscopic structure and statistics of objects as D-branes. By considering the macroscopic pure state (MPS) limit, whenever the entanglement entropy goes to zero (in such a way that the macroscopic properties of the state are preserved), we show that boundary states may be recovered in this limit and, furthermore, the description through closed string (perturbative) degrees of freedom collapses. We also show how the thermal properties of branes and closed strings could be described by this model, and it requires that dissipative effects be taken into account. Extensions of the MPS analysis to more general systems at finite temperature are finally emphasized.

14 pages. Minor improvements. Published in Phys. Rev. D

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• Left-Right Entanglement Entropy for a Dp-brane with Dynamics and Background Fields
• Thermal magnetized D-branes on $R^{1,p}\times T^{d-p-1}$ in the generalized Thermo Field Dynamics approach
• LREE of a Dynamical Unstable D$p$-brane
• Does HM mechanism work in string theory?
• Brane-Antibrane at Finite Temperature in the Framework of Thermo Field Dynamics
• LREE of a Dressed D$p$-brane with Transverse Motion in the Partially Compact Spacetime