Phantom collapse of electrically charged scalar field in dilaton gravity

TL;DR

This paper investigates how phantom couplings in dilaton gravity influence the gravitational collapse of charged scalar fields, revealing that negative kinetic energies can delay, alter, or prevent collapse, significantly affecting spacetime structures.

Contribution

It introduces the study of phantom couplings in dilaton gravity during scalar field collapse, highlighting their crucial impact on collapse dynamics and spacetime outcomes.

Findings

Negative kinetic energy delays collapse

Phantom coupling can prevent collapse

Spacetime structures are significantly affected

Abstract

Our research focus on gravitational collapse of electrically charged scalar field in dilaton gravity and in the presence of phantom coupling. We examine dynamical behaviour of the scalar field coupled to Maxwell field when gravitational interactions have form consistent with the low-energy limit of the string theory. Moreover, we allow the evolving fields to have negative sign in front of the respective kinetic term of the Lagrangian. The main aim of our studies is to investigate in what manner does the phantom nature of either Maxwell or dilaton fields (or both of them) affect the outcomes of the collapse. It turns out that the influence is crucial to the obtained spacetime structures. Negative kinetic energy of one (or both) of the fields delays, changes the course or even prevents the collapse.