Rotating thin shells in (2+1)-dimensional asymptotically AdS spacetimes: Mechanical properties, Machian effects, and energy conditions

TL;DR

This paper investigates the physical and mechanical properties of rotating thin shells in (2+1)-dimensional asymptotically AdS spacetimes, focusing on energy conditions, Machian effects, and the dynamics of the shells.

Contribution

It provides a detailed analysis of rotating thin shells in (2+1)-D AdS spacetime, including their energy-momentum properties and Machian effects, using Einstein equations and junction conditions.

Findings

Rotating shells exhibit Machian frame-dragging effects.

Energy conditions are analyzed for various shell configurations.

Dynamical quantities like energy density and angular momentum flux are computed.

Abstract

A rotating thin shell in a (2+1)-dimensional asymptotically AdS spacetime is studied. The spacetime exterior to the shell is the rotating BTZ spacetime and the interior is the empty spacetime with a cosmological constant. Through the Einstein equation in (2+1)-dimensions and the corresponding junction conditions we calculate the dynamical relevant quantities, namely, the rest energy-density, the pressure, and the angular momentum flux density. We also analyze the matter in a frame where its energy-momentum tensor has a perfect fluid form. In addition, we show that Machian effects, such as the dragging of inertial frames, also occur in rotating (2+1)-dimensional spacetimes. The weak and the dominant energy condition for these shells are discussed.