Wormholes, energy conditions and time machines

TL;DR

This paper discusses theoretical aspects of wormholes, energy conditions, and the possibility of time machines within the context of general relativity, based on a session from a 2018 scientific meeting.

Contribution

It provides a summary of discussions and recent insights on the feasibility and implications of wormholes and time machines in physics.

Findings

Wormholes require exotic matter violating energy conditions.

Time machines could theoretically exist with certain spacetime geometries.

Energy conditions are central to understanding wormhole stability.

Abstract

This report is based on the Parallel Session AT3 ``Wormholes, Energy Conditions and Time Machines'' of the Fifteenth Marcel Grossmann Meeting - MG15, held at the University of Rome ``La Sapienza'', Rome, in 2018.