arXiv subjects

Mendrit Latifi

Publications and source records attributed to Mendrit Latifi.

3 recordsLinked to original sources

arXiv2025

Cloud Screening of extremal charged BTZ black hole

We study the dynamics of a charged scalar field in the near-horizon region of an extremal charged BTZ black hole. The near-horizon geometry contains an AdS2 throat with a constant electric field, which lowers the effective mass of the scalar and can trigger a violation of the AdS2 Breitenlohner-Freedman bound. We show that this instability is resolved by the formation of a static scalar cloud supported by Schwinger pair production. The condensate backreacts on the gauge field and partially screens the electric flux, leading to a self-consistent stationary configuration. The scalar profile is obtained analytically from the near-horizon equations and exhibits the characteristic behavior of a BF-violating mode in AdS2. We analyze the associated boundary conditions, the induced charge density, and the resulting modification of the electric field. The resulting configuration can be interpreted as an electric analogue of known magnetic hairy black hole solutions. Our results provide a concrete realization of electric screening in extremal charged black holes and clarify the role of near-horizon dynamics in shaping the infrared structure of the solution.

hep-th↗

arXiv2025

Schwinger instability, modular flow, and holographic entropy for near-extremal charged BTZ black hole

We investigate the quantum dynamics of a charged scalar field in the near-horizon region of a near-extremal charged BTZ black hole. A controlled expansion of the Einstein-Maxwell equations reveals an emergent warped AdS$_2 \times S^1$ throat geometry threaded by a constant electric field--an ideal setting for studying Schwinger pair production, Hawking radiation, and entropy flow. By solving the Klein-Gordon equation using both tunneling and field-theoretic methods, we compute the pair production rate and identify an effective Unruh-like temperature. In particular, we apply the WKB approximation for Hawking tunneling, justified by the infinite blueshift experienced by outgoing modes near the horizon. Instability arises when local acceleration exceeds the AdS curvature scale, linking near-horizon dynamics to thermal emission. Through the generalized uncertainty principle, which implies the existence of a minimal length, we argue that quantum gravity effects can drive the Hawking and Schwinger-like temperatures to zero. To connect quantum radiation to geometry, we analyze the flux of the modular Hamiltonian across the horizon and show that its variation matches the entropic contribution of the produced pairs. Using Tomita-Takesaki theory and the type II\_\infty von Neumann algebra of horizon observables, we derive a semiclassical gravitational constraint involving the second variation of the stress tensor, recovering the null-null component of the Einstein equations from entropy extremization. The intersection point of inward and outward RT geodesics marks both the peak of pair production and the vanishing of entropy variation, revealing a geometric alignment between entanglement, quantum matter, and backreaction. The near-horizon geometry does not merely support quantum effects--it organizes them.

hep-th↗

arXiv2024

Exploring a novel Einstein--Rosen BTZ wormhole

We introduce a novel Einstein-Rosen BTZ wormhole metric as a solution to the Einstein field equations with a negative cosmological constant and explore in detail its various phenomenological aspects. We show that the wormhole metric is characterized by a horizon at the throat, resembling a black hole horizon. This implies that our wormhole metric describes a one-way traversable wormhole at the throat, with Hawking radiation observed by an observer located at some distance from the wormhole. It is also found the same Hawking temperature using the BTZ-like coordinates and Kruskal-like coordinates. This temperature is invariant not only on the type of coordinates but also the nature of the spin of quantum fields. Importantly, we find that at the wormhole throat, the spacetime is not a pure vacuum solution, but rather contains an exotic string matter source with negative tension, which may stabilize the wormhole geometry. To this end, we found that the size of the wormhole throat is proportional to the number of quantum bits suggesting a possible implications on ER=EPR. Further we studied the particle dynamics and, finally, we tested the ANEC with a test scalar and vector fields. For the double null-component computed in BTZ coordinates, we found an apparent divergence at the wormhole throat, which is then shown to be regularized by means of Kruskal-like coordinates. The ANEC for such a scalar/vector field is violated at the wormhole throat.

gr-qc↗