Black hole regions containing no trapped surfaces

TL;DR

This paper presents a straightforward criterion to identify regions within black holes where closed trapped surfaces cannot exist, aiding in understanding black hole structure.

Contribution

It introduces a new criterion that effectively rules out the presence of trapped surfaces in certain regions inside black holes.

Findings

Criterion successfully identifies regions without trapped surfaces

Enhances understanding of black hole interior geometry

Provides a tool for black hole analysis

Abstract

A simple criterion is given to rule out the existence of closed trapped surfaces in large open regions inside black holes.