SearcharxivSearch

arXiv subjects

Bilgehan Baris Oner

Publications and source records attributed to Bilgehan Baris Oner.

3 recordsLinked to original sources

On the Geometric Interpretation of Non-Singular Black Hole Interiors

Black hole singularities still remain a central challenge in gravitational physics. In this work, we present a geometric interpretation of non singular black hole cores within teleparallel gravity based on geometric drift vectors. Gravitational effects are encoded in a comoving tetrad framework through a dynamical drift field whose gradients generate torsion rather than spacetime curvature. While the teleparallel equivalent of general relativity reproduces the Schwarzschild behavior in the weak field regime, nonlinear invariant contributions dominate in the strong field region, replacing the central singular behavior with a smooth de Sitter like core. Event horizons emerge as drift horizons associated with the limiting behavior of the geometric flow, and null and timelike trajectories admit analytic extensions across the horizon and central region.

physics.gen-ph

Quantum Particle Creation by Cosmic Strings in de Sitter Spacetime

This paper explores the phenomenon of particle creation associated with cosmic strings in de Sitter spacetime, a model that represents the universe exponential expansion. We examine how the presence of cosmic strings in a de Sitter background affects particle production, focusing on the roles of string tension and angular deficits. Utilizing the Klein Gordon equation adapted to curved spacetime with cosmic string defects, we derive solutions expressed through hypergeometric functions to describe particle states. Our findings highlight how string properties influence particle creation rates and energy distributions. By analyzing both point-like and linear potentials near the string, we determine exact solutions, investigate asymptotic behaviors, and calculate particle creation probabilities using Bogoliubov transformations.

gr-qc